ASTM G139-05

Standard Test Method for Determining Stress-Corrosion Cracking Resistance of Heat-Treatable Aluminum Alloy Products Using Breaking Load Method

SCOPE
1.1 This test method covers procedures for evaluation of stress corrosion cracking (SCC) resistance by the breaking load test method, a concept which uses residual strength as the measure of damage evolution (in this case environmentally assisted cracking).
1.2 This test method covers specimen type and replication, test environment, stress levels, exposure periods, final strength determination, and statistical analysis of the raw residual strength data.
1.3 The test method was developed for use with heat-treatable aluminum alloys, that is, 2XXX alloys and 7XXX with 1.2 to 3.0 % Cu, and test specimens oriented in the short-transverse direction relative to grain structure (, ). However, the residual strength measurements and the statistics used to analyze the data are not specific to heat-treatable aluminum alloys and can be used for other specimen orientations and different types of materials.
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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2005
• ICS: 77.040.10 - Mechanical testing of metals
• ICS: 77.150.10 - Aluminium products
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.06 - Environmentally Assisted Cracking

Relations

• Replaces: ASTM G139-96 - Standard Test Method for Determining Stress-Corrosion Cracking Resistance of Heat-Treatable Aluminum Alloy Products Using Breaking Load Method (Withdrawn 2004)
• Effective Date: 01-Oct-2005
• Replaced By: ASTM G139-05(2011) - Standard Test Method for Determining Stress-Corrosion Cracking Resistance of Heat-Treatable Aluminum Alloy Products Using Breaking Load Method
• Effective Date: 01-Sep-2011
• Referred By: ASTM G47-22 - Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products
• Effective Date: 01-Oct-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: G139 – 05
Standard Test Method for
Determining Stress-Corrosion Cracking Resistance of Heat-
Treatable Aluminum Alloy Products Using Breaking Load
1
Method
This standard is issued under the fixed designation G139; 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 E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method covers procedures for evaluation of
G44 Practice for Exposure of Metals and Alloys by Alter-
stresscorrosioncracking(SCC)resistancebythebreakingload
nate Immersion in Neutral 3.5 % Sodium Chloride Solu-
test method, a concept which uses residual strength as the
tion
measure of damage evolution (in this case environmentally
G47 Test Method for Determining Susceptibility to Stress-
assisted cracking).
CorrosionCrackingof2XXXand7XXXAluminumAlloy
1.2 This test method covers specimen type and replication,
Products
test environment, stress levels, exposure periods, final strength
G49 Practice for Preparation and Use of Direct Tension
determination, and statistical analysis of the raw residual
Stress-Corrosion Test Specimens
strength data.
G64 ClassificationofResistancetoStress-CorrosionCrack-
1.3 The test method was developed for use with heat-
ing of Heat-Treatable Aluminum Alloys
treatable aluminum alloys, that is, 2XXX alloys and 7XXX
with 1.2 to 3.0% Cu, and test specimens oriented in the
3. Terminology
2
short-transverse direction relative to grain structure (1, 2).
3.1 Definitions of Terms Specific to This Standard:
However, the residual strength measurements and the statistics
3.1.1 censor—a statistical term indicating that the value
used to analyze the data are not specific to heat-treatable
from an individual observation may fall outside of the range
aluminum alloys and can be used for other specimen orienta-
that can be measured because of test procedures or conditions.
tions and different types of materials.
3.1.2 sample—the nominally uniform, bulk material from
1.4 This standard does not purport to address all of the
which individual stress-corrosion cracking specimens are ob-
safety concerns, if any, associated with its use. It is the
tained.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use.
4.1 This test method describes a procedure for using re-
sidual strength after exposure to a corrosive environment to
2. Referenced Documents
3 evaluate stress corrosion cracking susceptibility in heat treat-
2.1 ASTM Standards:
able aluminum alloy product forms such as sheet, plate,
E8 Test Methods for Tension Testing of Metallic Materials
extrusions, forgings, and bar. These products generally are
most susceptible to SCC in the long transverse direction of
1
This test method is under the jurisdiction of ASTM Committee G01 on
sheet, the short transverse direction of plate, extrusions and
Corrosion of Metals and is the direct responsibility of Subcommittee G01.06 on
forgings, and the transverse direction of rod and bar stock. In
Stress Corrosion Cracking and Corrosion Fatigue.
Current edition approved Oct. 1, 2005. Published October 2005. Originally
this test, tensile bars or direct tension sheet specimens, pre-
published as G139–96. DiscontinuedApril 2003 and reinstated as G139–05. Last
pared according to Practice G49, are exposed to 3.5 weight %
previous edition G139–96. DOI: 10.1520/G0139-05.
2 aqueous sodium chloride solution (Practice G44), are removed
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
before they fail and are tension tested to determine the amount
the standard.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
of corrosion damage that has occurred. The average retained
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
strength is then calculated and the Box-Cox Transformation
Standards volume information, refer to the standard’s Document Summary page on
can be used for statistical analysis of the results.
the ASTM website.
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G139 – 05
4.2 The procedure calls for exposure of unstressed speci- high many of the specimens will fail before the end of their
mens which are used to factor out the effects of pitting, scheduled exposure periods. The statistical procedures in-
intergranular, and general corrosion. These ph
...