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. G48 contains six different test methods for evaluating the pitting and crevice corrosion resistance of stainless and nickel alloys. A93 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.
This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels. The pH is adjusted to 1. These tests offer a means to evaluate and compare the expected performance of various astk. 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.
As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing.
Ferric Chloride Corrosion Testing – Rolled Alloys, Inc.
When Test Method A is specified as an acceptance test, specimens having other than acceptable etch structures may, at the option of the producer, a293 tested by Test Method B or Test Method C. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. The Charpy procedure as here applied is different from that as commonly applied for the determination of toughness and should not be used ast characterization of material toughness is the purpose of the testing.
These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. 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.
Proceedings of an international conference Diverless and Deepwater Techology: The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. Return to Blog List. B The acceptable minimum impact energy shall be agreed upon by seller and purchaser. It is informational only and not an official astj of the standard; the full text of the standard itself must be referred to for its use and application.
Log in to your subscription Username. Proceedings of an international conference Oceanology: These test methods will asstm necessarily detect losses of toughness or corrosion resistance attributable to other causes. Active view current version of standard. Link to Active This link will always route to the current Active version of the standard.
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The presence of these phases is detrimental to toughness and corrosion resistance. 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. Rock Mechanics Symposium and 5th U. 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.
Test Method C in Aastm is a ferric chloride pitting test. 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. There are no acceptance criteria for any alloys.
awtm Peer reviewed only Published between: 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. A Energy for a full-size specimen. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures.
Alloy material tested in a 6 wt. In the adtm of common heat treatment, this region will be that which cooled most slowly. 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.
ASTM A was a9233 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 confused with Test Methods G Historical Version s – view previous versions of standard.