ASTM A923 PDF

ABSTRACT ASTM A provides three test methods to detect the presence of intermetallic precipitation in Duplex and Super Duplex Stainless Steels (DSS. ASTM A provides three methods/practices to determine the extent of intermetallic precipitation in Duplex Stainless Steels. While Practice A. manual Point Count) and ASTM A (Standard Test Methods for Detecting various tests which were carried out were ASTM A Test Method A, B and C .

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These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece.

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The presence of these phases is detrimental to toughness and corrosion resistance. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures. Because the occurrence of intermetallic phases is a function of temperature and cooling rate, it is essential that the tests be applied to the region of the material experiencing the conditions most likely to promote the formation of an intermetallic phase.

In the case of common heat treatment, this region will be that which cooled most slowly. Except for rapidly cooled material, it may be necessary to sample from a location determined to be the most slowly cooled for the material piece to be characterized. The values given in parentheses are for information only.

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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.

This test method may be used with other evaluation tests to provide a rapid method for identifying those specimens that are free of detrimental intermetallic phases as measured in these other tests.

When Test Method A is specified a932 an acceptance test, specimens having other than acceptable etch structures may, at the option of the producer, be tested by Test Method B or Test Method C. The presence or absence of an indication of intermetallic phase in this test is not necessarily a measure of performance of the material in service with regard to any property other than that measured directly.

The Validity of Using ASTM A Practice for Weld Procedure Qualification of Duplex SSs

The Charpy procedure as here applied is different from that as commonly applied for the determination of toughness and should not be used when characterization of material toughness is the purpose of the testing.

A Energy for a full-size specimen. Required energy for a subsize specimen is reduced in direct proportion to the reduced area of the subsize specimen relative to that of the full-size specimen.

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B The acceptable minimum impact energy shall be agreed upon by seller and purchaser.

The presence or absence of corrosion attack in this test is not necessarily a measure of the performance of the material in other corrosive environments; in particular, it does not provide a basis for predicting resistance to forms of corrosion not associated with the precipitation of intermetallic phases see Note 4.

Note 4—Although this test method uses some equipment and procedures similar to those of Test Methods G 48this test method should not be confused with Test Methods G This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment.

This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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