ASTM G47-1998(2004) Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products《测定高强度铝合金制品应力腐蚀断裂敏感性的标准试验方法》.pdf
《ASTM G47-1998(2004) Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products《测定高强度铝合金制品应力腐蚀断裂敏感性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM G47-1998(2004) Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products《测定高强度铝合金制品应力腐蚀断裂敏感性的标准试验方法》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: G 47 98 (Reapproved 2004)Standard Test Method forDetermining Susceptibility to Stress-Corrosion Cracking of2XXX and 7XXX Aluminum Alloy Products1This standard is issued under the fixed designation G 47; the number immediately following the designation indicates the year of originaladopt
2、ion or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.
3、Scope1.1 This test method covers a uniform procedure for char-acterizing the resistance to stress-corrosion cracking (SCC) ofhigh-strength aluminum alloy wrought products for the guid-ance of those who perform stress-corrosion tests, for those whoprepare stress-corrosion specifications, and for mate
4、rials engi-neers.1.2 This test method covers method of sampling, type ofspecimen, specimen preparation, test environment, and methodof exposure for determining the susceptibility to SCC of 2XXX(with 1.8 to 7.0 % copper) and 7XXX (with 0.4 to 2.8 %copper) aluminum alloy products, particularly when st
5、ressed inthe short-transverse direction relative to the grain structure.1.3 The values stated in SI units are to be regarded asstandard. The inch-pound units in parentheses are provided forinformation.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with it
6、s use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2G 38 Practice for Making and Using the C-Ring Stress-Corrosion Test Spe
7、cimensG 44 Practice for Exposure of Metals and Alloys by Alter-nate Immersion in Neutral 3.5% Sodium Chloride SolutionG 49 Practice for Preparation and Use of Direct TensionStress-Corrosion Test SpecimensG 139 Test Method for Determining the Stress-CorrosionCracking Resistance of Heat-Treatable Alum
8、inum AlloyProducts Using the Breaking Load Method3. Summary of Test Method3.1 This test method provides a comprehensive procedurefor accelerated stress-corrosion testing high-strength aluminumalloy product forms, particularly when stressed in the short-transverse grain direction. It specifies tests
9、of constant-strain-loaded, 3.18-mm (0.125-in.) tension specimens or C-ringsexposed to 3.5 % sodium chloride (NaCl) solution by alternateimmersion, and includes procedures for sampling variousmanufactured product forms, examination of exposed testspecimens, and interpretation of test results.4. Signi
10、ficance and Use4.1 The 3.5 % NaCl solution alternate immersion test pro-vides a test environment for detecting materials that would belikely to be susceptible to SCC in natural outdoor environ-ments, especially environments with marine influences.3,4,5Fordetermining actual serviceability of a materi
11、al, other stress-corrosion tests should be performed in the intended serviceenvironment under conditions relating to the end use, includingprotective measures.4.2 Although this test method is intended for certain alloytypes and for testing products primarily in the short-transversestressing directio
12、n, this method is useful for some other typesof alloys and stressing directions.5. Interferences5.1 A disadvantage of the 3.5 % NaCl solution alternateimmersion test is that severe pitting may develop in thespecimens. Such pitting in tension specimens with relatively1This test method, which was deve
13、loped by a joint task group with theAluminum Association, Inc., is under the jurisdiction of ASTM Committee G01 onCorrosion of Metals, and is the direct responsibility of Subcommittee G01.06 onEnvironmentally Assisted Cracking.Current edition approved May 1, 2004. Published May 2004. Originallyappro
14、ved in 1976. Last previous edition approved in 1998 as G 47 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM websit
15、e.3Romans, H. B., Stress Corrosion Testing, ASTM STP 425, ASTM, 1967, pp.182208.4Brown, R. H., Sprowls, D. O., and Shumaker, M. B., “The Resistance ofWrought High Strength Aluminum Alloys to Stress Corrosion Cracking,” StressCorrosion Cracking of MetalsA State of the Art, ASTM STP 518, ASTM, 1972, p
16、p.87118.5Sprowls, D. O., Summerson, T. J., Ugiansky, G. M., Epstein, S. G., and Craig,H. L., Jr., “Evaluation of a Proposed Standard Method of Testing for Susceptibilityto Stress-Corrosion Cracking of High-Strength 7XXX Series Aluminum AlloyProducts,” Stress Corrosion-New Approaches, ASTM STP 610, A
17、STM, 1976, pp.331.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.small cross section can markedly reduce the effective cross-sectional area and produce a net section stress greater than thenominal gross section stress, resulting in
18、either: (a) fracture bymechanical overload of a material that is not susceptible toSCC; or (b) SCC of a material at an actual stress higher thanthe intended nominal test stress. The occurrence of either ofthese phenomena might then interfere with a valid evaluationof materials with relatively high r
19、esistance to stress corrosion.6. Test Specimen6.1 Type and SizeNo single configuration of test specimenis applicable for the many complex shapes and sizes ofproducts that must be evaluated. A tension specimen is pre-ferred because it more consistently provides definite evidenceof cracking and should
20、 be used whenever the size and shape ofthe product permits; it also provides a more severe test.6.1.1 Tension SpecimenThe diameter of the reduced sec-tion shall be 3.17 6 0.03 mm (0.125 6 0.001 in.).6.1.2 C-Ring (see Practices G 38)The use of C-ringspermits short-transverse tests to be made of secti
21、ons that aretoo thin or complex for practical tests with a tension specimen.C-rings may be of various sizes as required for the product tobe tested, but in no case less than 15.88 6 0.05 mm (0.625 60.002 in.) in outside diameter. The ratio of diameter to wallthickness shall be kept in the range from
22、 11:1 to 16:1.6.2 Stressing Direction:6.2.1 Short-Transverse Tests:6.2.1.1 For specified material thicknesses of 38.10 mm(1.500 in.) and over, the tension specimen shall be used.6.2.1.2 For specified material thicknesses of 17.78 through38.08 mm (0.700 through 1.499 in.), a C-ring shall be used. Ate
23、nsion specimen may be used if consistent with the provisionsof Practice G 49.6.2.2 For other stress directions in materials of 6.35 mm(0.250 in.) and over, the tension specimen shall be used.6.3 Surface PreparationTest specimens shall be de-greased prior to exposure.7. Sampling and Number of Tests7.
24、1 Unless otherwise specified, tests shall be performed inthe short-transverse direction; the intention is to orient thespecimen so that the applied tensile stress is perpendicular tothe metal flow lines and in the short-transverse directionrelative to the grain structure. In rolled or extruded secti
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