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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Alloy material tested in a 6 wt. In the case of common heat treatment, this region will be that which cooled most slowly. 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.
These tests offer a means to evaluate and compare the expected performance of various alloys. The speed of w923 precipitation reactions is a function of composition astn thermal or thermomechanical history of each individual piece.
Peer reviewed only Published between: 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 aatm material toughness is the purpose of the testing. Publishers Content Coverage Privacy.
ASTM A Testing – Detecting Intermetallic Phases in Duplex Steels
As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing. Rapid cooling of the product provides astk maximum resistance to formation of detrimental phases by subsequent thermal exposures. ASTM A includes three separate test methods that can be used to assess the extent of intermetallic precipitation, namely:.
Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is recommended. It is informational only and not an official part of the standard; axtm full text of the standard itself must be referred to for its use and application. Required energy for a subsize specimen w923 reduced in direct proportion to the reduced a293 of the subsize specimen relative to that of the full-size specimen.
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. Link to Active This link will always route to the current Active version of the standard. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. In the case 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. 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.
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 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.
A actually contains three different test methods for determining acceptability. The pH is adjusted to 1. Active view current version of standard. Proceedings of an International Conference Submersible Technology: 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.
Sheriff’s Encyclopedic Dictionary aatm Applied Geophysics, fourth edition. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory asmt prior to use. The presence of these phases is detrimental to toughness and corrosion resistance.
There are no acceptance criteria for any 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 an intermetallic phase.
Log in to your subscription Username. North America Asia Europe Tools. They can be used as acceptance tests if criteria e. However, since the tests are slightly different, material tested in accordance with one method cannot be certified to the other without re-testing. Test Method C in A is a ferric chloride pitting test. Proceedings of an international conference Oceanology: