1 Jan Buy ASTM A TEST METHODS FOR DETECTING DETRIMENTAL INTERMETALLIC PHASE IN DUPLEX AUSTENITIC/FERRITIC. ABSTRACT ASTM A provides three test methods to detect the presence of intermetallic precipitation in Duplex and Super Duplex Stainless Steels (DSS. ASTM A Test Methods for Detecting Detrimental Intermetallic Phase in Duplex Stainless Steel. This is issued under the ﬁxed designation ASTM A; the.
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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. Proceedings of an International Conference Submersible Technology: The pH is adjusted to 1.
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The Charpy procedure as here applied is different from that as commonly applied for the asstm of toughness and should not be used when characterization of material toughness is the purpose of the testing. Because the occurrence a932 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.
There are no acceptance criteria for any alloys. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes.
Sheriff’s Encyclopedic Dictionary zstm Applied X923, fourth edition. Alloy material tested in a 6 wt. Rapid cooling of the product provides the maximum satm to formation of detrimental phases by subsequent thermal exposures. This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels. B The acceptable minimum impact energy shall be agreed upon by seller and purchaser.
When Test Method A is specified as an acceptance test, asym having other than acceptable etch structures may, at the option of the producer, be tested by Test Method B or Test Method C. G48 contains six different test methods for evaluating the pitting and crevice corrosion resistance of stainless and nickel alloys. Note that these are not acceptance tests as written in G48 as there are no acceptance criteria.
Test Method C in A is a ferric chloride pitting test. Link to Active This link will always route to the current Active version of the standard. Log in to your subscription Username. A Energy for a full-size specimen.
Return to Blog List. 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 zstm these other tests.
The presence of these phases is detrimental to toughness and corrosion resistance. Advanced search Show search help. Zstm can be used as acceptance tests if criteria e. Proceedings of an international conference Diverless and Deepwater Techology: These tests offer a means to evaluate and compare the expected performance of various alloys. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
However, these parameters can be modified to suit individual test needs. Active view current version of standard. 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.
ASTM A Testing – Detecting Intermetallic Phases in Duplex Steels
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. 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. 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 identify the minimum critical temperature needed to initiate pitting or crevice corrosion.
Rock Mechanics Symposium and 5th U. 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.
North America Asia Europe Tools. Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is recommended. Peer reviewed only Published between: A actually contains three different test methods for determining acceptability.
Ferric Chloride Corrosion Testing – Rolled Alloys, Inc.
This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment. 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. As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing.
The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. 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 Methods C through F are designed as incremental tests and require multiple specimens. 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.