ASTM A1038-10a
(Practice)Standard Test Method for Portable Hardness Testing by the Ultrasonic Contact Impedance Method
Standard Test Method for Portable Hardness Testing by the Ultrasonic Contact Impedance Method
SIGNIFICANCE AND USE
The hardness of a material is a defined quantity having many scales and being dependent on the way the test is performed. In order to avoid the creation of a new method involving a new hardness scale, the UCI method converts into common hardness values, for example, HV, HRC, etc.
The UCI hardness test is a superficial determination, only measuring the hardness condition of the surface contacted. The results generated at a specific location do not represent the part at any other surface location and yield no information about the material at subsurface locations.
The UCI hardness test may be used on large or small components at various locations. It can be used to make hardness measurements on positions difficult to access, such as tooth flanks or roots of gears.
SCOPE
1.1 This test method covers the determination of comparative hardness values by applying the Ultrasonic Contact Impedance Method (UCI Method).
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A1038 − 10a
StandardTest Method for
Portable Hardness Testing by the Ultrasonic Contact
1
Impedance Method
This standard is issued under the fixed designation A1038; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* E691Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method covers the determination of compara-
tive hardness values by applying the Ultrasonic Contact
3. Terminology
Impedance Method (UCI Method).
3.1 Definitions:
1.2 The values stated in SI units are to be regarded as
3.1.1 UCI method—Ultrasonic Contact Impedance, a hard-
standard. No other units of measurement are included in this
ness testing method developed by Dr. Claus Kleesattel in 1961
standard.
based on the measurement of the frequency shift of a resonat-
ingrodcausedbytheessentiallyelasticnatureofthefinitearea
1.3 This standard does not purport to address all of the
of contact between the indenter and the test piece during the
safety concerns, if any, associated with its use. It is the
penetration.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3.1.2 UCI hardness test—a hardness testing method using a
bility of regulatory limitations prior to use.
calibrated instrument by pressing a resonating rod with a
defined indenter, for example, a Vickers diamond, with a fixed
2. Referenced Documents
force against the surface of the part to be tested.
2
2.1 ASTM Standards:
3.1.3 calibration—determination of the specific values of
A370Test Methods and Definitions for Mechanical Testing
the significant operating parameters of the UCI instrument by
of Steel Products
comparisonwithvaluesindicatedbyastandardizedworkbench
E10Test Method for Brinell Hardness of Metallic Materials
hardness tester or by a set of certified reference test pieces.
E18Test Methods for Rockwell Hardness of Metallic Ma-
3.1.4 verification—checking or testing the UCI instrument
terials
to ensure conformance with this test method.
E140Hardness Conversion Tables for Metals Relationship
3.1.5 surface finish—all references to surface finish in this
Among Brinell Hardness, Vickers Hardness, Rockwell
test method are defined as surface roughness (that is, Ra =
Hardness, Superficial Hardness, Knoop Hardness, and
average roughness value).
Scleroscope Hardness
E177Practice for Use of the Terms Precision and Bias in
4. Significance and Use
ASTM Test Methods
4.1 The hardness of a material is a defined quantity having
E384Test Method for Knoop and Vickers Hardness of
many scales and being dependent on the way the test is
Materials
performed. In order to avoid the creation of a new method
involving a new hardness scale, the UCI method converts into
common hardness values, for example, HV, HRC, etc.
1
This test method is under the jurisdiction of ASTM Committee A01 on Steel,
4.2 The UCI hardness test is a superficial determination,
Stainless Steel and Related Alloysand is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
only measuring the hardness condition of the surface con-
Current edition approved Nov. 1, 2010. Published November 2010. Originally
tacted. The results generated at a specific location do not
approved in 2005. Last previous edition approved in 2010 as A1038–10. DOI:
represent the part at any other surface location and yield no
10.1520/A1038-10A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or information about the material at subsurface locations.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.3 The UCI hardness test may be used on large or small
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
components at various locations. It can be used to make
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A1038 − 10a
Legend:
FIG. 2 Hardness Value versus Frequency Shift of the Oscillating
T = Piezo Transducer
R = Receiver Rod
O = Oscillating rod
V = indenter, for example, Vickers diamond
m = test material
elasticcontact,whichresultsinapositivefrequencyshiftofthe
FIG. 1 Schematic Description of the UCI Probe
resonatingrod.Thisshiftisrelatedtothesizeoftheindentarea
(contact area of the indenter with the material). The size, in
hardnessmeasurementsonpositionsdifficulttoaccess,suchas turn,isameasureforthehardnessofthetest
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:A1038–10
Standard Practice for Designation:A1038–10a
Standard Test Method for
Portable Hardness Testing by the Ultrasonic Contact
1
Impedance Method
This standard is issued under the fixed designation A1038; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This practicetest method covers the determination of comparative hardness values by applying the Ultrasonic Contact
Impedance Method (UCI Method).
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
E10 Test Method for Brinell Hardness of Metallic Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials E92Test Method for Vickers Hardness of Metallic Materials
E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness,
Superficial Hardness, Knoop Hardness, and Scleroscope Hardness
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E384 Test Method for Knoop and Vickers Hardness of Materials
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 UCI method—Ultrasonic Contact Impedance, a hardness testing method developed by Dr. Claus Kleesattel in 1961 based
on the measurement of the frequency shift of a resonating rod caused by the essentially elastic nature of the finite area of contact
between the indenter and the test piece during the penetration.
3.1.2 UCI hardness test—a hardness testing practicemethod using a calibrated instrument by pressing a resonating rod with a
defined indenter, for example, a Vickers diamond, with a fixed force against the surface of the part to be tested.
3.1.3 calibration—determination of the specific values of the significant operating parameters of the UCI instrument by
comparison with values indicated by a standardized workbench hardness tester or by a set of certified reference test pieces.
3.1.4 verification—checking or testing the UCI instrument to ensure conformance with this practice. test method.
3.1.5 surface finish—all references to surface finish in this practicetest method are defined as surface roughness (that is, Ra =
average roughness value).
4. Significance and Use
4.1 The hardness of a material is a defined quantity having many scales and being dependent on the way the test is performed.
In order to avoid the creation of a new practicemethod involving a new hardness scale, the UCI method converts into common
1
This practice test method is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
Current edition approved May 15,Nov. 1, 2010. Published JuneNovember 2010. Originally approved in 2005. Last previous edition approved in 20082010 asA1038 – 108.
DOI: 10.1520/A1038-10A.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
A1038–10a
hardness values, for example, HV, HRC, etc.
4.2 The UCI hardness test is a superficial determination, only measuring the hardness condition of the surface contacted. The
results generated at a specific location do not represent the part at any other surface location and yield no information about the
material at subsurface locations.
4.3 The UCI hardness test may be used on large or small components at various locations. It can be used to make hardness
measurements on positions difficult to access
...
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