ASTM G47-2019 pdf free download

07-17-2021 comment

ASTM G47-2019 pdf free download.Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products.
3.1 This test method provides a comprehensive procedure for accelerated stress-corrosion testing high-strength aluminum alloy product forms, particularly when stressed in the short- transverse grain direction. It spccitics tests of constant-strain- loaded, 3.18-mm (0.125-in.) tension specimens or C-rings exposed to 3.5 % sodium chloride (NaCI) solution by alternate immersion, and includes procedures for sampling various manufactured product forms, examination of exposed test specimens. and interpretation of test results.
4. Significance and Use
4.1 The 3.5 % NaCI solution alternate immersion test provides a test environment for detecting materials that would be likely to he susceptible to SCC in natural outdoor environments, especially environments with marine inOuences.34’5 For determining actual serviceability of a material, other stress-corrosion tests should be performed in the intended service environment under conditions relating to the end use, including protective measures.
4.2 Ahhough this test method is intended for certain alloy types and tot testing products primarily in the short-transverse stressing direction, this method is useful for some oilier types of alloys and stressing directions.
5. Interferences
5.1 A disadvantage of the 3.5 ‘ NaCI solution alternate immersion test is that severe pitting may develop in the specimens. Such pitting in tension specimens with relatively small cross section can markedly reduce the effective cross- sectional area and produce a net section stress greater than the nominal gross section stress, resulting in either: (I) fracture by mechanical overload of a material that is not susceptible to SCC; or (2) SCC of a material at an actual stress higher than the intended nominal test stress. The OCCUITCflCC of either of these phenomena might then interfere with a valid evaluation of materials with relatively high resistance to stress corrosion.
6. Tvst Specimen
6.1 Type and Size—No single configuration of test specimen is applicable for the many complex shapes and sizes of products that must be evaluated. A tension specimen is preferred because it more concistently provides definite evidence of cracking and should be used whenever the size and shape of the product permits: it also provides a more severe test.
6.1.1 Te,,sio,, Specimen- -The diameter of the reduced section shall be 3.17 ± 0.03 mm (0.125 0.001 in.).
6.1.2 (‘-Ring (see Pracik.s G38)—The use of C-rings permits short-transverse tests to be made of sections that arc t(x) thin or complex for practical tests with a tension specimen. C-rings may be of various sizes as required for the product to be tested, but in no case less than 15.88 ± 0.05 mm (0.625 ± 0.002 in.) in outside diameter. The ratio of diameter to wall thickness shall be kept in the range from 11:1 to 16:1.
6.2 Sire.ssing Direciion:
6.2.1 Shon-Transcerse! 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 through
38.08 mm (0.700 through 1.499 in,). a C-ring shall be used. A
tension specimen may be used if consistent with the provisions
o Practice (i49.
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 Preparation—Test specirneils shall be degreased prior to exposure.ASTM G47 pdf free download.
7. Sampling and Number of Tests
7.1 Unless otherwise specified, tests shall be performed in the short-transverse direction: the intention is to orient the specimen so that the applied tensile stress is perpendicular to the metal flow lines and in the short-transverse direction relative to the grain structure. In rolled or extruded sections that are approximately round or square. there is no true short-transverse direction because in a transverse plane the grains tend to be equiaxial; and, in such cases, the stress should he directed simply in the transverse direction, If, in certain unusual cases, the grain structure is or tends to be equiaxial also in the longitudinal direction, the stress shall be applied in a direction parallel to the smallest dimension of the product.
7.2 Location of Specimens:
7.2.1 For products stress relieved by stretching (TX5I. TX5 10. TX5 11, TXX5 1. TXX5 10. TXX5 11). samples shall not be taken from the portion under the stretcher grips.
7.2.2 Rolled Plate—Short-transverse specimens shall be taken so that the region of maximum stress is centered on the mid-plane of the plate and at least 2½ plate thicknesses away from a side of the plate. (The side of the plate is defined as the edge parallel to the rolling direction.)
7.2.3 Hand Forgings—Short-transverse specimens shall be taken so that the stress is applied in a direction perpendicular to the forging flow lines. The region of maximum stress shall be centered in the forging thickness and approximately on the longitudinal center line of the forging. no less than ½ the section thickness away from “as-heat treated” edges of the forging.
7.2.4 Die Forgings—Because of the wide variety of configurations of die forgings. guidelines are provided for only certain common types of shapes that are widely used. Short- transverse specimens shall be taken so that the stress is applied in a direction perpendicular to the forging flow lines and, if possible. with the region of maximum stress centered on the parting plane. The metal flow pattern in die lorgings cannot always be predicted. so only a few general rules are given, and they are illustrated in Fig. I. Departures from these rules should be made only on the basis of a study of forging flow lines indicating that the intended type of test would not be obtained. In every case, a diagram should be filed with the test results to illustrate specimen locations and orientations.ASTM G47 pdf download.

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