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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Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is recommended. However, since the tests are slightly different, material tested in accordance with one method cannot be certified to the other without re-testing. It is well known that the precipitation of intermetallics such as sigma phase and chi phase can promote loss of toughness, and loss of corrosion resistance.
Link to Active This link will always route aa923 the current Active version of the standard. Methods C through F a293 designed as incremental tests and require multiple specimens. 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.
However, these parameters can be modified to suit individual test needs. This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment.
ASTM A Testing – Detecting Intermetallic Phases in Duplex Steels
They can be used as acceptance tests if criteria e. 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 Active view current version of standard.
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.
In the case of common heat treatment, this region will be that which cooled most slowly. Note that these are not acceptance tests as written in G48 as there are no acceptance criteria. The presence of these phases is detrimental to toughness and corrosion resistance. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes.
This abstract is a brief summary of the referenced standard. Advanced search Show search help. B The acceptable minimum impact energy shall be agreed upon by seller and purchaser. 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. 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.
ASTM A was implemented to assess the presence of intermetallic phases in base material, but has also been used for weld qualification.
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Alloy material tested in a 6 wt. A Energy for a full-size specimen.
The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece.
Link to Active This link will always route to the current Active version of the standard. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece.
The pH is adjusted to 1. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes.
The Validity of Using ASTM A Practice for Weld Procedure Qualification of Duplex SSs
The values given in parentheses are for information only. Because the occurrence of intermetallic phases is a function of temperature adtm cooling rate, it is essential that the tests be applied to the region of the material experiencing the conditions most likely to promote aastm formation of an intermetallic phase. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Test Method C in A is a ferric chloride pitting test. G48 a9223 six different test methods for evaluating the pitting and crevice corrosion resistance of stainless and nickel alloys.