ASTM G129-21
(Practice)Standard Practice for Slow Strain Rate Testing to Evaluate the Susceptibility of Metallic Materials to Environmentally Assisted Cracking
Standard Practice for Slow Strain Rate Testing to Evaluate the Susceptibility of Metallic Materials to Environmentally Assisted Cracking
SIGNIFICANCE AND USE
5.1 The slow strain rate test is used for relatively rapid screening or comparative evaluation, or both, of environmental, processing or metallurgical variables, or both, that can affect the resistance of a material to EAC. For example, this testing technique has been used to evaluate materials, heat treatments, chemical constituents in the environment, and temperature and chemical inhibitors.
5.2 Where possible, the application of the SSR test and data derived from its use should be used in combination with service experience or long-term EAC data, or both, obtained through literature sources or additional testing using other testing techniques. In applications where there has been little or no prior experience with SSR testing or little EAC data on the particular material/environment combination of interest, the following steps are recommended:
5.2.1 The SSR tests should be conducted over a range of applied extension rates (that is, usually at least one order of magnitude in applied extension rate above and below 10−6 in./s (2.54 × 10–5 mm/s) to determine the effect of strain rate or rate of increase of the stress or stress intensity factor on susceptibility to EAC.
5.2.2 Constant load or strain EAC tests should also be conducted in simulated service environments, and service experience should be obtained so that a correlation between SSR test results and anticipated service performance can be developed.
5.3 In many cases the SSR test has been found to be a conservative test for EAC. Therefore, it may produce failures in the laboratory under conditions which do not necessarily cause EAC under service application. Additionally, in some limited cases, EAC indications are not found in smooth tension SSR tests even when service failures have been observed. This effect usually occurs when there is a delay in the initiation of localized corrosion processes. Therefore, the suggestions given in 5.2 are strongly encouraged.
5.4 In some cases, EAC will only o...
SCOPE
1.1 This practice covers procedures for the design, preparation, and use of axially loaded, tension test specimens and fatigue pre-cracked (fracture mechanics) specimens for use in slow strain rate (SSR) tests to investigate the resistance of metallic materials to environmentally assisted cracking (EAC). While some investigators utilize SSR test techniques in combination with cyclic or fatigue loading, no attempt has been made to incorporate such techniques into this practice.
1.2 Slow strain rate testing is applicable to the evaluation of a wide variety of metallic materials in test environments which simulate aqueous, nonaqueous, and gaseous service environments over a wide range of temperatures and pressures that may cause EAC of susceptible materials.
1.3 The primary use of this practice is to furnish accepted procedures for the accelerated testing of the resistance of metallic materials to EAC under various environmental conditions. In many cases, the initiation of EAC is accelerated through the application of a dynamic strain in the gauge section or at a notch tip or crack tip, or both, of a specimen. Due to the accelerated nature of this test, the results are not intended to necessarily represent service performance, but rather to provide a basis for screening, for detection of an environmental interaction with a material, and for comparative evaluation of the effects of metallurgical and environmental variables on sensitivity to known environmental cracking problems.
1.4 Further information on SSR test methods is available in ISO 7539 and in the references provided with this practice (1-6).2
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility ...
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G129 − 21
Standard Practice for
Slow Strain Rate Testing to Evaluate the Susceptibility of
1
Metallic Materials to Environmentally Assisted Cracking
This standard is issued under the fixed designation G129; 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 1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This practice covers procedures for the design,
responsibility of the user of this standard to establish appro-
preparation, and use of axially loaded, tension test specimens
priate safety, health, and environmental practices and deter-
andfatiguepre-cracked(fracturemechanics)specimensforuse
mine the applicability of regulatory limitations prior to use.
in slow strain rate (SSR) tests to investigate the resistance of
Furthermore, in some cases, special facilities will be required
metallicmaterialstoenvironmentallyassistedcracking(EAC).
to isolate these tests from laboratory personnel if high pres-
While some investigators utilize SSR test techniques in com-
sures or toxic chemical environments, or both, are utilized in
bination with cyclic or fatigue loading, no attempt has been
SSR testing.
made to incorporate such techniques into this practice.
1.7 This international standard was developed in accor-
1.2 Slowstrainratetestingisapplicabletotheevaluationof
dance with internationally recognized principles on standard-
awidevarietyofmetallicmaterialsintestenvironmentswhich
ization established in the Decision on Principles for the
simulate aqueous, nonaqueous, and gaseous service environ-
Development of International Standards, Guides and Recom-
ments over a wide range of temperatures and pressures that
mendations issued by the World Trade Organization Technical
may cause EAC of susceptible materials.
Barriers to Trade (TBT) Committee.
1.3 The primary use of this practice is to furnish accepted
2. Referenced Documents
procedures for the accelerated testing of the resistance of
metallic materials to EAC under various environmental condi- 3
2.1 ASTM Standards:
tions. In many cases, the initiation of EAC is accelerated
A370Test Methods and Definitions for Mechanical Testing
throughtheapplicationofadynamicstraininthegaugesection
of Steel Products
oratanotchtiporcracktip,orboth,ofaspecimen.Duetothe
B557Test Methods for Tension Testing Wrought and Cast
accelerated nature of this test, the results are not intended to
Aluminum- and Magnesium-Alloy Products
necessarily represent service performance, but rather to pro-
D1193Specification for Reagent Water
vide a basis for screening, for detection of an environmental
E4Practices for Force Verification of Testing Machines
interaction with a material, and for comparative evaluation of
E6Terminology Relating to Methods of Mechanical Testing
the effects of metallurgical and environmental variables on
E8/E8MTest Methods for Tension Testing of Metallic Ma-
sensitivity to known environmental cracking problems.
terials
1.4 Further information on SSR test methods is available in E399Test Method for Linear-Elastic Plane-Strain Fracture
ISO 7539 and in the references provided with this practice Toughness of Metallic Materials
2
(1-6). E602Test Method for Sharp-Notch Tension Testing with
4
(Withdrawn 2010)
Cylindrical Specimens
1.5 The values stated in SI units are to be regarded as
E616Terminology Relating to Fracture Testing (Withdrawn
standard. The values given in parentheses after SI units are
4
1996)
provided for information only and are not considered standard.
E647 Test Method for Measurement of Fatigue Crack
Growth Rates
1
This practice is under the jurisdiction ofASTM Committee G01 on Corrosion
of Metals and is the direct responsibility of Subcommittee G01.06 on Environmen-
3
tally Assisted Cracking. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2021. Published June 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1995. Last previous edition approved in 2013 as G129–00 (2013). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/G0129-21. the ASTM website.
2 4
The boldface numbers in parentheses refer to a list of references at the end of The last approved version of this historical standard is referenced on
this standard. www.astm.org.
Copyright © ASTM International, 100 Barr H
...
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: G129 − 00 (Reapproved 2013) G129 − 21
Standard Practice for
Slow Strain Rate Testing to Evaluate the Susceptibility of
1
Metallic Materials to Environmentally Assisted Cracking
This standard is issued under the fixed designation G129; 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 practice covers procedures for the design, preparation, and use of axially loaded, tension test specimens and fatigue
pre-cracked (fracture mechanics) specimens for use in slow strain rate (SSR) tests to investigate the resistance of metallic materials
to environmentally assisted cracking (EAC). While some investigators utilize SSR test techniques in combination with cyclic or
fatigue loading, no attempt has been made to incorporate such techniques into this practice.
1.2 Slow strain rate testing is applicable to the evaluation of a wide variety of metallic materials in test environments which
simulate aqueous, nonaqueous, and gaseous service environments over a wide range of temperatures and pressures that may cause
EAC of susceptible materials.
1.3 The primary use of this practice is to furnish accepted procedures for the accelerated testing of the resistance of metallic
materials to EAC under various environmental conditions. In many cases, the initiation of EAC is accelerated through the
application of a dynamic strain in the gauge section or at a notch tip or crack tip, or both, of a specimen. Due to the accelerated
nature of this test, the results are not intended to necessarily represent service performance, but rather to provide a basis for
screening, for detection of an environmental interaction with a material, and for comparative evaluation of the effects of
metallurgical and environmental variables on sensitivity to known environmental cracking problems.
2
1.4 Further information on SSR test methods is available in ISO 7539 and in the references provided with this practice (1-6).
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. after
SI units are provided for information only and are not considered standard.
1.6 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. Furthermore, in some cases, special facilities will be required to isolate these
tests from laboratory personnel if high pressures or toxic chemical environments, or both, are utilized in SSR testing.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion of Metals and is the direct responsibility of Subcommittee G01.06 on Environmentally
Assisted Cracking.
Current edition approved May 1, 2013May 1, 2021. Published July 2013June 2021. Originally approved in 1995. Last previous edition approved in 20062013 as G129 – 00
(2006).(2013). DOI: 10.1520/G0129-00R13.10.1520/G0129-21.
2
The boldface numbers in parentheses refer to a list of references 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 ----------------------
G129 − 21
2. Referenced Documents
3
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products
D1193 Specification for Reagent Water
E4 Practices for Force Verification of Testing Machines
E6 Terminology Relating to Methods of Mechanical Testing
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
E399 Test Method for Linear-Elastic Plane-Strain Fracture Toughness of Metallic Materials
4
E602 Test Method for Sharp-Notch Tension Testing with Cylindrical Specimens (Withdrawn 2010)
4
E616
...
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