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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It is wstm only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
Methods C through F are designed as incremental tests and require multiple specimens.
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However, these parameters can be modified to suit individual test needs. Astk is the responsibility of the user of this standard to establish appropriate safety and ast, practices and determine the applicability of regulatory limitations prior to use. Proceedings of an international conference Subsea Controls and Data Acquisition ‘ 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Active view current version of standard.
The presence of these phases is detrimental to toughness and corrosion resistance. 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.
Return to Blog List. Recently, use of these alloys has met with challenges, many of them having to do with welding operations. ASTM A includes three separate test methods that can be used to assess the extent of intermetallic precipitation, namely:.
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. Link to Active This link will always route to the current Active version of the standard. ASTM A was sstm to assess the presence of intermetallic phases in base material, but has also been used for weld qualification.
Note 4—Although this test method uses some equipment and procedures similar to those of Test Methods G 48this test method should not be asm with Test Methods G Proceedings of an international conference Oceanology: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B The acceptable minimum impact energy shall be agreed upon by seller and purchaser. 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. Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is recommended. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures.
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 A-sodium hydroxide etch test, test method B-Charpy impact test, and test method C-ferric chloride corrosion test shall be made for classification of structures of duplex stainless steels. This abstract is a brief summary of the referenced standard. 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.
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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 a932 not provide a basis for predicting resistance to forms of corrosion not associated with the precipitation of intermetallic phases see Note 4. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes.
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. A actually contains three different test methods for determining acceptability. There are no acceptance criteria for any alloys. It is the wstm of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations xstm to use.
In the case of common heat treatment, this region will be that which cooled most slowly. The values given in parentheses are for information only. These tests identify the minimum critical temperature needed to initiate pitting or crevice corrosion. As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good asmt were similarly growing.
Log in to your subscription Username. Advanced search Show awtm help. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. Test Method C in A is a ferric chloride pitting test. Rock Mechanics Symposium and 5th U.
ASTM A Testing – Detecting Intermetallic Phases in Duplex Steels
This test method does not a293 the critical pitting temperature or test for the suitability for use in a particular environment. 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.
Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures. The presence of these phases is detrimental to toughness and corrosion resistance.