EN ISO 7539-7:2005
(Main)Corrosion of metals and alloys - Stress corrosion testing - Part 7: Method for slow strain rate testing (ISO 7539-7:2005)
Corrosion of metals and alloys - Stress corrosion testing - Part 7: Method for slow strain rate testing (ISO 7539-7:2005)
ISO 7539-7:2005 covers procedures for conducting slow strain rate tests for investigating susceptibility of a metal to stress corrosion cracking, including hydrogen-induced failure. The term "metal" as used in this part of ISO 7539 includes alloys.
Slow strain rate tests are adaptable for testing a wide variety of product forms, including plate, rod, wire, sheet and tubes, as well as composites of these and parts joined by welding. Notched specimens may be used, as well as initially plain specimens.
The principal advantage of the test is the rapidity with which susceptibility to stress corrosion cracking of a particular metal/environment combination can be assessed.
Korrosion von Metallen und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 7: Prüfung mit langsamer Dehngeschwindigkeit (ISO 7539-7:2005)
Dieser vorliegende Teil von ISO 7539 behandelt Verfahren für die Durchführung von Prüfungen mit langsamer Dehngeschwindigkeit zur Untersuchung der Anfälligkeit eines Metalls gegenüber Spannungsrisskorrosion einschließlich der wasserstoffinduzierten Schädigung.
In diesem Teil der ISO 7539 werden mit dem Begriff "Metall" auch Legierungen erfasst.
Prüfungen mit langsamer Dehngeschwindigkeit sind für die Prüfung einer Vielzahl von Erzeugnisformen geeignet, einschließlich Blech, Stäben, Draht, Band und Rohren sowie der daraus zusammengesetzten Teile und der geschweißten Verbindungen dieser Produkte. Gekerbte Proben können ebenso verwendet werden wie glatte Proben.
Der eigentliche Vorteil dieser Prüfung besteht in der Geschwindigkeit, mit der die Anfälligkeit einer bestimmten Kombination Werkstoff/Medium gegenüber Spannungsrisskorrosion beurteilt werden kann.
Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 7: Méthode d'essai à faible vitesse de déformation (ISO 7539-7:2005)
L'ISO 7539-7:2005 spécifie la méthode d'essai à faible vitesse de déformation visant à établir la sensibilité d'un métal à la fissuration par corrosion sous contrainte, y compris la fragilisation par l'hydrogène.
La méthode d'essai à faible vitesse de déformation convient à une multitude de formes de produits, comme les tôles fortes, les barres, les fils, les tôles minces et les tubes, ainsi qu'aux ensembles composites de ces divers éléments et aux pièces assemblées par soudage. Il est possible d'utiliser des éprouvettes entaillées ainsi que des éprouvettes initialement lisses.
Le principal avantage de cette méthode d'essai est la rapidité avec laquelle la sensibilité à la fissuration par corrosion sous contrainte peut être évaluée, pour une combinaison donnée de métal et d'environnement.
Korozija kovin in zlitin - Preskušanje napetostne korozije - 7. del: Preskušanje z metodo počasne deformacije (ISO 7539-7:2005)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2005
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SIST EN ISO 7539-7:1999
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Corrosion of metals and alloys - Stress corrosion testing - Part 7: Method for slow strain
rate testing (ISO 7539-7:2005)
Korrosion von Metallen und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 7:
Prüfung mit langsamer Dehngeschwindigkeit (ISO 7539-7:2005)
Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 7:
Méthode d'essai a faible vitesse de déformation (ISO 7539-7:2005)
Ta slovenski standard je istoveten z: EN ISO 7539-7:2005
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 7539-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2005
ICS 77.060 Supersedes EN ISO 7539-7:1995
English version
Corrosion of metals and alloys - Stress corrosion testing - Part
7: Method for slow strain rate testing (ISO 7539-7:2005)
Corrosion des métaux et alliages - Essais de corrosion Korrosion von Metallen und Legierungen - Prüfung der
sous contrainte - Partie 7: Méthode d'essai à faible vitesse Spannungsrisskorrosion - Teil 7: Prüfung mit langsamer
de déformation (ISO 7539-7:2005) Dehngeschwindigkeit (ISO 7539-7:2005)
This European Standard was approved by CEN on 17 January 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7539-7:2005: E
worldwide for CEN national Members.
Foreword
This document (EN ISO 7539-7:2005) has been prepared by Technical Committee ISO/TC 156
"Corrosion of metals and alloys" in collaboration with Technical Committee CEN/TC 262
"Metallic and other inorganic coatings", the secretariat of which is held by BSI.
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 August 2005, and conflicting national
standards shall be withdrawn at the latest by August 2005.
This document supersedes EN ISO 7539-7:1995.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 7539-7:2005 has been approved by CEN as EN ISO 7539-7:2005 without any
modifications.
INTERNATIONAL ISO
STANDARD 7539-7
Second edition
2005-02-01
Corrosion of metals and alloys — Stress
corrosion testing —
Part 7:
Method for slow strain rate testing
Corrosion des métaux et alliages — Essais de corrosion sous
contrainte —
Partie 7: Méthode d'essai à faible vitesse de déformation
Reference number
ISO 7539-7:2005(E)
©
ISO 2005
ISO 7539-7:2005(E)
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ii © ISO 2005 – All rights reserved
ISO 7539-7:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 7539-7 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
This second edition cancels and replaces the first edition (ISO 7539-7:1989), Clauses 1, 3, 4, 6, 7 and 8 of
which have been technically revised.
ISO 7539 consists of the following parts, under the general title Corrosion of metals and alloys — Stress
corrosion testing:
— Part 1: General guidance on testing procedures
— Part 2: Preparation and use of bent-beam specimens
— Part 3: Preparation and use of U-bend specimens
— Part 4: Preparation and use of uniaxially loaded tension specimens
— Part 5: Preparation and use of C-ring specimens
— Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant
displacement
— Part 7: Method for slow strain rate testing
— Part 8: Preparation and use of specimens to evaluate weldments
— Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement
INTERNATIONAL STANDARD ISO 7539-7:2005(E)
Corrosion of metals and alloys — Stress corrosion testing —
Part 7:
Method for slow strain rate testing
1 Scope
This part of ISO 7539 covers procedures for conducting slow strain rate tests for investigating susceptibility of
a metal to stress corrosion cracking, including hydrogen-induced failure.
The term “metal” as used in this part of ISO 7539 includes alloys.
Slow strain rate tests are adaptable for testing a wide variety of product forms, including plate, rod, wire, sheet
and tubes, as well as composites of these and parts joined by welding. Notched specimens may be used, as
well as initially plain specimens.
The principal advantage of the test is the rapidity with which susceptibility to stress corrosion cracking of a
particular metal/environment combination can be assessed.
2 Normative references
The following referenced documents are indispensable for the application 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 7539-1:1987, Corrosion of metals and alloys — Stress corrosion testing — Part 1: General guidance on
testing procedures
ISO 7539-4:1989, Corrosion of metals and alloys — Stress corrosion testing — Part 4: Preparation and use of
uniaxially loaded tension specimens
ISO 7539-6:2003, Corrosion of metal and alloys — Stress corrosion testing — Part 6: Preparation and use of
pre-cracked specimens for tests under constant load or constant displacement
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7539-1 and the following apply.
3.1
creep
time-dependent mechanical deformation of a specimen after application of the initial load
3.2
elongation to fracture
ratio, of the increase in gauge length which has occurred during a test, to the original gauge length, expressed
as a percentage
ISO 7539-7:2005(E)
3.3
maximum load
maximum value of the load achieved during a test taken to total failure or, in the case of composite materials,
the load corresponding to failure of one element
3.4
nominal stress-elongation curves
plot of the nominal stress calculated from the instantaneous applied load and the original cross-sectional area
of a specimen, against the elongation of the gauge length at the time of the load measurement
3.5
plastic strain to failure
estimated plastic contribution to the total strain to failure determined by subtracting the elastic strain at failure
from the total strain at failure
3.6
reduction of area
ratio of the maximum decrease in cross-sectional area which has occurred during a test, to the original cross-
sectional area, expressed as a percentage
3.7
strain rate
initial rate of increase in gauge length of an initially plain tensile specimen
4 Principle
4.1 The test consists of subjecting a specimen to increasing strain whilst exposed to a specified
environment with a view to determining stress corrosion susceptibility by reference to one or more of the
parameters enumerated in Clause 7.
4.2 Corrosive environments may cause a deterioration of the properties of stressed materials beyond those
observed with the same combination of environment and material when the latter is not subjected to slow
dynamic strain. This enhanced deterioration, usually due to the initiation and growth of cracks, may be
expressed in a number of different ways for the purpose of assessing stress corrosion susceptibility.
4.3 Tests may be conducted in tension or in bending, on initially plain or notched specimens. The most
important characteristic of the test is the relatively slow strain rate generated at the region of crack initiation or
growth in the metal, hence the preference for such tests being referred to as slow strain rate tests.
5 Specimens
5.1 A variety of specimen shapes and sizes can be used, but those most commonly utilized are described
in ISO 7539-4 and ISO 7539-6.
5.2 The remarks in the aforementioned documents concerning specimen design, preparation and gripping
are equally applicable to specimens for slow strain rate tests.
6 Procedure
6.1 The equipment required for slow strain rate testing consists of a device that permits a selection of
deflection rates whilst being powerful enough to cope with the loads generated. Deflection rates that have
−3 −1 −7 −1
been used most frequently in testing initially plain specimens are in the range 10 s to 10 s .
6.2 Notched specimens may be used when it is desired to restrict cracking to a particular location, e.g.
when testing the heat-affected zone associated with a weld or whenever a given piece of material exhibits a
2 © ISO 2005 – All rights reserved
ISO 7539-7:2005(E)
range of mechanical properties that would be likely to promote different strain rates in different parts of a
specimen. Notched specimens may also be used to restrict load requirements, where bending, as opposed to
tensile loading, may offer further advantages.
6.3 For initially plain specimens, especially with a waisted gauge length, the strain rate at the outset of the
test is readily defined, but once cracks are initiated and have grown to some extent in such specimens,
straining is likely to be concentrated in the material in the vicinity of the crack tip and may not be the same as
the initial strain rate. Rigorous solutions for the strain rate at notches are not yet available, but it is likely that
the effective strain rates will be higher than those for the same displacement rates applied to plain specimens.
6.4 Tests may involve taking a specimen to total failure, and assessing the mode of failure in order to
determine susceptibility to stress corrosion cracking, or stopping a test at some intermediate stage and then
determining the extent of crack initiation or growth.
6.5 Experience suggests that for initially pla
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