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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This test asym does not determine the critical pitting temperature or test for the suitability for use in a particular environment. These test methods xstm not necessarily detect losses of toughness or corrosion resistance attributable to other causes.
This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels. Link to Active S923 link will always route to the current Active version of the standard. Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is recommended. Return to Blog List. The presence of these phases is detrimental to toughness and corrosion resistance.
There are no acceptance criteria for any ast. Test Method C in A is a ferric chloride pitting test. 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.
Active view current version of standard. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures.
Link to Awtm This link will always route to the current Active version of the standard. 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.
Recently, use of these alloys has met with challenges, many of them having to do with welding operations.
G48 contains six different test methods for evaluating the pitting and crevice asfm resistance of stainless and nickel alloys. 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 asym intermetallic phase. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Peer reviewed only Published between: This abstract is a brief summary of the referenced standard.
The presence of these phases is detrimental to toughness and corrosion resistance. A astn contains ast, different test methods for determining acceptability. Proceedings of an international conference Diverless and Deepwater Techology: A Energy for a full-size specimen. 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 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 a23 of corrosion not associated with the precipitation of intermetallic phases see Note 4.
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However, these parameters can be modified to suit individual test needs. Proceedings of an international conference Oceanology: It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine asfm applicability of regulatory limitations prior to use. The values given in parentheses are for information only.
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.
As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing. Because of the extensive testing required and time consuming nature, these tests are generally not used for production testing, even when acceptance criteria are provided. In the case of common heat treatment, this region will be that which cooled most slowly.
They can be used as acceptance tests if criteria e. Historical Version s – view previous versions of standard.
Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. 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.
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.
ASTM A Testing – Detecting Intermetallic Phases in Duplex Steels
Methods C through F are designed as incremental tests and require multiple specimens. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece.
These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. 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.
These tests offer a means to evaluate and compare the expected performance of various alloys. The values given in parentheses are for information only. Alloy material tested in a 6 wt. 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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