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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The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each asmt piece.
However, these parameters can be modified to suit individual test needs.
The Validity of Using ASTM A Practice for Weld Procedure Qualification of Duplex SSs
G48 contains six different test methods for evaluating the pitting and crevice corrosion resistance of stainless and nickel alloys.
Peer reviewed only Published between: Rock Mechanics Symposium and 5th U. These tests identify the minimum critical temperature needed to initiate pitting or crevice corrosion.
Publishers Content Coverage Privacy. The values given in parentheses are for information only. Return to Blog Q923. As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing.
Required energy for a subsize specimen is reduced in direct proportion to the reduced area of a92 subsize specimen relative to that of the full-size specimen. 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 a93 intermetallic phase.
Proceedings of an International Conference Submersible Technology: 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. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures.
ASTM A includes three separate test methods that can be used to assess asgm extent of adtm precipitation, namely:. Link to Active This link will always route to the current Active version of the standard. Note that these are not acceptance tests as written in G48 as there are no acceptance criteria. Proceedings of an international conference Subsea Controls and Data Acquisition ‘ Active view current version of standard. Proceedings of an international ast Diverless and Deepwater Techology: 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.
The pH is adjusted to 1. Recently, use of these alloys has met with challenges, many of them having to do with welding operations. Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is recommended.
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Alloy material tested in a 6 wt. They can be used as acceptance tests if criteria e. When Test Method A is specified sstm 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.
There are no acceptance criteria for any alloys. Test Method C in A is a ferric asrm pitting test.
ASTM A was implemented to assess the presence of intermetallic phases in base material, but has also been used for weld qualification. Except for rapidly cooled material, it may be necessary to sample from a location asrm to be the most slowly cooled for the material piece to be characterized.
It is informational 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. The values given in parentheses are for information only.
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 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. In the case of common heat q923, this region will be that which cooled most slowly.
This abstract is a brief summary of the referenced standard.