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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 .

Because the occurrence of intermetallic phases is a function of temperature and cooling rate, it is essential that asstm 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.

Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is aztm. B The acceptable minimum impact energy shall be agreed upon by seller and purchaser. Active view current version of standard.

Publishers Content Coverage Privacy. 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. Test Method C in A is a ferric chloride pitting test. The presence of these phases is detrimental to toughness and corrosion resistance. Proceedings of an international conference Subsea Controls and Data Acquisition ‘ Note that these are not acceptance tests as written in G48 as there are no acceptance criteria.

The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels.

However, since the tests are slightly different, material tested in accordance with one method cannot be certified to the other without re-testing.

ASTM A Testing – Detecting Intermetallic Phases in Duplex Steels

Aatm presence of these phases is detrimental to toughness and corrosion resistance. Rock Mechanics Symposium and 5th U. Link to Active This link will always route to the current Active version of the standard.

Peer reviewed only Published between: 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.

While Test Method A electrolytic NaOH etch can be used as a screening test, it is sometimes not permitted for this purpose by User specifications.

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ASTM A was implemented to assess the presence of intermetallic phases in base material, but has also been used for weld qualification. The pH is adjusted to 1.

The values given in parentheses are for information only.

Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures. In the case of common heat treatment, this region will be that which cooled most slowly. 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.

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. Log in to your subscription Username. When Test Method A is specified as 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.

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Because the occurrence of intermetallic phases is a function of temperature and cooling rate, it is essential that the a92 be applied to the region of the material experiencing the conditions most likely to promote the formation of an intermetallic phase. They can be used as acceptance tests if criteria e.

The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. North America Asia Europe Tools. 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.

G48 contains six different test methods for evaluating the pitting and crevice corrosion resistance of stainless and nickel alloys.