Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1:2018)

ISO 6507-1:2018 specifies the Vickers hardness test method for the three different ranges of test force for metallic materials including hardmetals and other cemented carbides.

Metallische Werkstoffe - Härteprüfung nach Vickers - Teil 1: Prüfverfahren (ISO 6507-1:2018)

Dieses Dokument legt das Verfahren für die Härteprüfung nach Vickers für metallische Werkstoffe, einschließlich Hartmetallen und anderen Sintercarbiden, für drei unterschiedliche Bereiche der Prüfkraft fest (siehe Tabelle 1).
Tabelle 1 — Bereiche der Prüfkraft
Bereiche der Prüfkraft F
N   Härtesymbol   Benennung
F ≥ 49,03   ≥ HV 5   Härteprüfung nach Vickers
1,961 ≤ F < 49,03   HV 0,2 bis < HV 5   Härteprüfung nach Vickers im Kleinkraftbereich
0,009 807 ≤ F < 1,961   HV 0,001 bis < HV 0,2   Vickers-Mikrohärteprüfung
Die Härteprüfung nach Vickers ist in diesem Dokument für Eindruckdiagonalen mit Längen zwischen 0,020 mm und 1,400 mm festgelegt. Die Anwendung dieses Verfahrens zur Bestimmung der Vickers-Härte (en: Vickers hardness, HV)  anhand kleinerer Eindrücke fällt nicht in den Anwendungsbereich dieses Dokuments, da die Ergebnisse aufgrund der Grenzen der optischen Messung und Unregelmäßigkeiten bei der Spitzengeometrie großen Messunsicherheiten unterliegen würden.
Für die Routineüberprüfung der vom Anwender genutzten Prüfmaschine ist ein Verfahren zur regelmäßigen Überprüfung festgelegt.
Für besondere Werkstoffe und/oder Erzeugnisse gibt es spezielle Internationale Normen.

Matériaux métalliques - Essai de dureté Vickers - Partie 1: Méthode d'essai (ISO 6507-1:2018)

L'ISO 6507-1:2018 spécifie la méthode d'essai de dureté Vickers pour les trois plages différentes de force d'essai, pour les matériaux métalliques y compris les métaux durs et autres carbures cimentaires.

Kovinski materiali - Preskus trdote po Vickersu - 1. del: Preskusni postopek (ISO 6507-1:2018)

Ta dokument določa metodo za preskus trdote po Vickersu za tri različne razpone preskusne sile za kovinske materiale, vključno s trdinami in drugimi cementiranimi karbidi (glejte preglednico 1).
Preskus trdote po Vickersu je v tem dokumentu določen za dolžine diagonal zarez od 0,020 do 1,400 mm. Uporaba te metode za določanje trdote po Vickersu na podlagi manjših zarez ne sodi v področje uporabe tega dokumenta, saj bi bili rezultati nezanesljivi zaradi negotovosti, povezane z omejitvami optičnega merjenja in nepravilnostmi geometrije konice.
Določena je tudi metoda za redno preverjanje pri rutinskem pregledovanju naprave za preskušanje, ki jo uporablja uporabnik.
Za posebne materiale in/ali izdelke obstajajo posamezni mednarodni standardi.

General Information

Status
Withdrawn
Publication Date
29-Jun-2018
Withdrawal Date
29-Sep-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
07-Mar-2018
Completion Date
07-Mar-2018

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SLOVENSKI STANDARD
SIST EN ISO 6507-1:2018
01-julij-2018
1DGRPHãþD
SIST EN ISO 6507-1:2006

Kovinski materiali - Preskus trdote po Vickersu - 1. del: Preskusni postopek (ISO

6507-1:2018)

Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1:2018)

Metallische Werkstoffe - Härteprüfung nach Vickers - Teil 1: Prüfverfahren (ISO 6507-

1:2018)

Matériaux métalliques - Essai de dureté Vickers - Partie 1: Méthode d'essai (ISO 6507-

1:2018)
Ta slovenski standard je istoveten z: EN ISO 6507-1:2018
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 6507-1:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 6507-1:2018
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SIST EN ISO 6507-1:2018
EN ISO 6507-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2018
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 6507-1:2005
English Version
Metallic materials - Vickers hardness test - Part 1: Test
method (ISO 6507-1:2018)

Matériaux métalliques - Essai de dureté Vickers - Partie Metallische Werkstoffe - Härteprüfung nach Vickers -

1: Méthode d'essai (ISO 6507-1:2018) Teil 1: Prüfverfahren (ISO 6507-1:2018)
This European Standard was approved by CEN on 18 January 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6507-1:2018 E

worldwide for CEN national Members.
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SIST EN ISO 6507-1:2018
EN ISO 6507-1:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 6507-1:2018
EN ISO 6507-1:2018 (E)
European foreword

This document (EN ISO 6507-1:2018) has been prepared by Technical Committee ISO/TC 164

“Mechanical testing of metals” in collaboration with Technical Committee ECISS/TC 101 “Test methods

for steel (other than chemical analysis)” the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by September 2018, and conflicting national standards

shall be withdrawn at the latest by September 2018.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 6507-1:2005.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 6507-1:2018 has been approved by CEN as EN ISO 6507-1:2018 without any

modification.
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SIST EN ISO 6507-1:2018
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SIST EN ISO 6507-1:2018
INTERNATIONAL ISO
STANDARD 6507-1
Fourth edition
2018-01
Metallic materials — Vickers
hardness test —
Part 1:
Test method
Matériaux métalliques — Essai de dureté Vickers —
Partie 1: Méthode d'essai
Reference number
ISO 6507-1:2018(E)
ISO 2018
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Symbols and designations .......................................................................................................................................................................... 2

5.1 Symbols and designations used in this document ................................................................................................... 2

5.2 Designation of hardness number ............................................................................................................................................ 3

6 Testing machine .................................................................................................................................................................................................... 3

6.1 Testing machine ..................................................................................................................................................................................... 3

6.2 Indenter ......... ................................................................................................................................................................................................ 3

6.3 Diagonal measuring system ......................................................................................................................................................... 4

7 Test piece ...................................................................................................................................................................................................................... 4

7.1 Test surface ................................................................................................................................................................................................ 4

7.2 Preparation ................................................................................................................................................................................................ 4

7.3 Thickness ..................................................................................................................................................................................................... 4

7.4 Tests on curved surfaces ................................................................................................................................................................. 4

7.5 Support of unstable test pieces ................................................................................................................................................. 5

8 Procedure..................................................................................................................................................................................................................... 5

8.1 Test temperature ................................................................................................................................................................................... 5

8.2 Test force ...................................................................................................................................................................................................... 5

8.3 Periodic verification ........................................................................................................................................................................... 5

8.4 Test piece support and orientation ....................................................................................................................................... 5

8.5 Focus on test surface .......................................................................................................................................................................... 6

8.6 Test force application ........................................................................................................................................................................ 6

8.7 Prevention of the effect of shock or vibration .............................................................................................................. 6

8.8 Minimum distance between adjacent indentations ................................................................................................ 6

8.9 Measurement of the diagonal length ................................................................................................................................... 7

8.10 Calculation of hardness value .................................................................................................................................................... 7

9 Uncertainty of the results ............................................................................................................................................................................ 7

10 Test report ................................................................................................................................................................................................................... 8

Annex A (normative) Minimum thickness of the test piece in relation to the test force and

to the hardness ....................................................................................................................................................................................................... 9

Annex B (normative) Tables of correction factors for use in tests made on curved surfaces ................11

Annex C (normative) Procedure for periodic checking of the testing machine, diagonal

measuring system and the indenter by the user ..............................................................................................................15

Annex D (informative) Uncertainty of the measured hardness values ..........................................................................17

Annex E (informative) Vickers hardness measurement traceability ...............................................................................24

Annex F (informative) CCM — Working group on hardness ......................................................................................................28

Annex G (informative) Adjustment of Köhler illumination systems ................................................................................29

Bibliography .............................................................................................................................................................................................................................30

© ISO 2018 – All rights reserved iii
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals,

Subcommittee SC 3, Hardness testing.

This fourth edition cancels and replaces the third edition (ISO 6507-1:2005), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— requirements for testing hardmetals and other cemented carbides have been added;

— all references of indentation diagonals, <0,020 mm, have been removed;
— resolution requirements for the measuring system have been defined;

— the lower test force limit of the Vickers microhardness test has been expanded to 0,009 807 N;

— requirements for the periodic (weekly or daily) verifications of the testing machine are normative,

and the maximum permissible bias value has been revised. Requirements for the maximum

permissible error in measuring a reference indentation have been revised;
— recommendations for inspection and monitoring of the indenter have been added;

— requirements have been added for the approach velocity of the indenter prior to contact with the

sample surface;

— the timing requirements for the test force application and the duration at maximum test force have

been revised to indicate target time values;

— Figure 2, which illustrates the requirements for the minimum distance between indentations, has

been added, but the requirements have not changed;

— requirements have been added to the test report for reporting the test date and any hardness

conversion method used;
iv © ISO 2018 – All rights reserved
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)
— Annex D has been revised;

— Annexes E, F and G have been added concerning Vickers hardness measurement traceability, the

CCM — Working group on hardness and adjustment of Köhler illumination systems.
A list of all parts in the ISO 6507 series can be found on the ISO website.
© ISO 2018 – All rights reserved v
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SIST EN ISO 6507-1:2018
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SIST EN ISO 6507-1:2018
INTERNATIONAL STANDARD ISO 6507-1:2018(E)
Metallic materials — Vickers hardness test —
Part 1:
Test method
1 Scope

This document specifies the Vickers hardness test method for the three different ranges of test force for

metallic materials including hardmetals and other cemented carbides (see Table 1).

Table 1 — Ranges of test force
Ranges of test force, F
Hardness symbol Designation
F ≥ 49,03 ≥HV 5 Vickers hardness test
1,961 ≤ F < 49,03 HV 0,2 to 0,009 807 ≤ F < 1,961 HV 0,001 to

The Vickers hardness test is specified in this document for lengths of indentation diagonals between

0,020 mm and 1,400 mm. Using this method to determine Vickers hardness from smaller indentations

is outside the scope of this document as results would suffer from large uncertainties due to the

limitations of optical measurement and imperfections in tip geometry.

A periodic verification method is specified for routine checking of the testing machine in service by

the user.

For specific materials and/or products, particular International Standards exist.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 6507-2:2017, Metallic materials — Vickers hardness test — Part 2: Verification and calibration of

testing machines

ISO 6507-3, Metallic materials — Vickers hardness test — Part 3: Calibration of reference blocks

3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
© ISO 2018 – All rights reserved 1
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)
4 Principle

A diamond indenter, in the form of a right pyramid with a square base and with a specified angle

between opposite faces at the vertex, is forced into the surface of a test piece followed by measurement

of the diagonal length of the indentation left in the surface after removal of the test force, F (see

Figure 1).
Figure 1 — Principle of the test, geometry of indenter and Vickers indentation

The Vickers hardness is proportional to the quotient obtained by dividing the test force by the area

of the sloped surface of indentation, which is assumed to be a right pyramid with a square base and

having at the vertex the same angle as the indenter.
NOTE 1 A right pyramid has its apex aligned with the centre of the base.

NOTE 2 As applicable, this document has adopted hardness test parameters as defined by the Working Group

on Hardness (CCM-WGH) under the framework of the International Committee of Weights and Measures (CIPM)

Consultative Committee for Mass and Related Quantities (CCM) (see Annex F).
5 Symbols and designations
5.1 Symbols and designations used in this document
See Table 2 and Figure 1.
2 © ISO 2018 – All rights reserved
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)
Table 2 — Symbols and designations
Symbol Designation

α Mean angle between the opposite faces at the vertex of the pyramidal indenter (nominally 136°)

(see Figure 1)
F Test force, in newtons (N)

d Arithmetic mean, in millimetres, of the two diagonal lengths d and d (see Figure 1)

1 2
Test force (kgf)
Vickers hardness =
Surface area of indentation (mm )
1 TestForce(N)

n Surfaceareaofindentation(mm)
2Fsin
1 F 1
=× =×
g α g
 
2 d
d /s2 in
 
 
For the nominal angle α = 136°,
Vickers hardness ≈×0,1891

NOTE 1 Standard acceleration due to gravity, g = 9,806 65 m/s which is the conversion factor from kgf to N

To reduce uncertainty, the Vickers hardness may be calculated using the actual mean indenter angle, α.

5.2 Designation of hardness number
Vickers hardness, HV, is designated as shown in the following example.
6 Testing machine
6.1 Testing machine

The testing machine shall be capable of applying a predetermined force or forces within the desired

range of test forces, in accordance with ISO 6507-2.
6.2 Indenter

The indenter shall be a diamond in the shape of a right pyramid with a square base, as specified in

ISO 6507-2.
© ISO 2018 – All rights reserved 3
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)
6.3 Diagonal measuring system
The diagonal measuring system shall satisfy the requirements in ISO 6507-2.

Magnifications should be provided so that the diagonal can be enlarged to greater than 25 % but less

than 75 % of the maximum possible optical field of view. Many objective lenses are nonlinear towards

the edge of the field of view.

A diagonal measuring system using a camera for measurement can use 100 % of the camera’s field of

view provided it is designed to consider field of view limitations of the optical system.

The resolution required of the diagonal measuring system depends on the size of the smallest

indentation to be measured and shall be in accordance with Table 3. In determining the resolution of

the measuring system, the resolution of the microscope optics, the digital resolution of the measuring

scale and the step-size of any stage movement, where applicable, should be taken into account.

Table 3 — Resolution of the measuring system
Diagonal length, d
Resolution of the measuring system
0,020 ≤ d < 0,080 0,000 4 mm
0,080 ≤ d ≤ 1,400 0,5 % of d
7 Test piece
7.1 Test surface

The test shall be carried out on a surface which is smooth and even, free from oxide scale, foreign matter

and, in particular, completely free from lubricants, unless otherwise specified in product standards.

The finish of the surface shall permit accurate determination of the diagonal length of the indentation.

For hardmetal samples, the thickness of the layer removed from the surface shall be not less than 0,2 mm.

7.2 Preparation

Surface preparation shall be carried out in such a way as to prevent surface damage or alteration of the

surface hardness due to excessive heating or cold-working.

Due to the small depth of Vickers microhardness indentations, it is essential that special precautions

be taken during preparation. It is recommended to use a polishing/electropolishing process which is

suitable for the material to be measured.
7.3 Thickness

The thickness of the test piece or of the layer under test shall be at least 1,5 times the diagonal length of

the indentation as defined in Annex A. No deformation shall be visible at the back of the test piece after

the test.
The thickness of a hardmetal test piece shall be at least 1 mm.

NOTE The depth of the indentation is approximately 1/7 of the diagonal length (0,143 d).

7.4 Tests on curved surfaces

For tests on curved surfaces, the corrections given in Tables B.1 to B.6 shall be applied.

4 © ISO 2018 – All rights reserved
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)
7.5 Support of unstable test pieces

For a test piece of small cross-section or of irregular shape, either a dedicated support should be used

or it should be mounted in a similar manner to a metallographic micro-section in appropriate material

so that it is adequately supported and does not move during the force application.

8 Procedure
8.1 Test temperature

The test is normally carried out at ambient temperature within the limits of 10 °C to 35 °C. If the test

is carried out at a temperature outside this range, it shall be noted in the test report. Tests carried out

under controlled conditions shall be made at a temperature of (23 ± 5) °C.
8.2 Test force

The test forces given in Table 4 are typical. Other test forces may be used including greater than 980,7 N,

but not less than 0,009 807 N. Test forces shall be chosen that result in indentations with diagonals

greater than 0,020 mm.
NOTE For hardmetals, the preferred test force is 294,2 N (HV 30).
Table 4 — Typical test forces
Hardness test Low-force hardness test Microhardness test
Nominal value of Nominal value of Nominal value of
Hardness Hardness Hardness
the test force, F the test force, F the test force, F
symbol symbol symbol
N N N
— — — — HV 0,001 0,009 807
— — — — HV 0,002 0,019 61
— — — — HV 0,003 0,029 42
— — — — HV 0,005 0.049 03
HV 5 49,03 HV 0,2 1,961 HV 0,01 0,098 07
HV 10 98,07 HV 0,3 2,942 HV 0,015 0,147 1
HV 20 196,1 HV 0,5 4,903 HV 0,02 0,196 1
HV 30 294,2 HV 1 9,807 HV 0,025 0,245 2
HV 50 490,3 HV 2 19,61 HV 0,05 0,490 3
HV 100 980,7 HV 3 29,42 HV 0,1 0,980 7
Nominal test forces greater than 980,7 N may be applied.
8.3 Periodic verification

The periodic verification defined in Annex C shall be performed within a week prior to use for each test

force used but is recommended on the day of use. The periodic verification is recommended whenever

the test force is changed. The periodic verification shall be done whenever the indenter is changed.

8.4 Test piece support and orientation

The test piece shall be placed on a rigid support. The support surfaces shall be clean and free from

foreign matter (scale, oil, dirt, etc.). It is important that the test piece lies firmly on the support so that

any displacement that affects the test result cannot occur during the test.

For anisotropic materials, for example, those which have been heavily cold-worked, there could be a

difference between the lengths of the two diagonals of the indentation. Therefore, where possible, the

© ISO 2018 – All rights reserved 5
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SIST EN ISO 6507-1:2018
ISO 6507-1:2018(E)

indentation should be made so that the diagonals are oriented in plane at approximately 45° to the

direction of cold-working. The specification for the product could indicate limits for the differences

between the lengths of the two diagonals.
8.5 Focus on test surface

The diagonal measuring system microscope shall be focused so that the specimen surface and the

desired test location can be observed.

NOTE Some testing machines do not require that the microscope be focused on the specimen surface.

8.6 Test force application

The indenter shall be brought into contact with the test surface and the test force shall be applied in a

direction perpendicular to the surface, without shock, vibration or overload, until the applied force

attains the specified value. The time from the initial application of the force until the full test force is

reached shall be7 s .

NOTE 1 The requirements for the time durations are given with asymmetric limits. For example, 7 s

indicates that 7 s is the nominal time duration, with an acceptable range of not less than 2 s (calculated as 7 s – 5 s)

to not more than 8 s (calculated as 7 s + 1 s).

For the Vickers hardness range and low-force Vickers hardness range tests, the indenter shall contact

the test piece at a velocity of ≤0,2 mm/s. For micro-hardness tests, the indenter shall contact the test

piece at a velocity of ≤0,070 mm/s.

The duration of the test force shall be 14 s , except for tests on materials whose time-dependent

properties would make this an unsuitable range. For these tests, this duration shall be specified as part

of the hardness designation (see 5.2).

NOTE 2 There is evidence that some materials are sensitive to the rate of straining which causes changes in

the value of the yield strength. The corresponding effect on the termination of the formation of an indentation

can make alterations in the hardness value.
8.7 Prevention of the effect of shock or vibration
[5]
Throughout the test, the testing machine s
...

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