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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Rock Mechanics Symposium and 5th U. B The acceptable minimum impact energy shall be agreed upon by seller and purchaser. Active view current version of standard.
Alloy material tested in a 6 wt. However, these parameters can be modified to suit individual test needs. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. ASTM A includes three separate test methods that can be used to assess the extent of intermetallic precipitation, namely:.
Proceedings of an International Conference Submersible Technology: The presence of these phases is detrimental to toughness and corrosion resistance. Test Method C in A is a ferric chloride pitting test. 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.
This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment.
ASTM A923 Test Methods for Detecting Detrimental Intermetallic Phase in Duplex Stainless Steel
North America Asia Europe Tools. 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.
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. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. Proceedings of an international conference Diverless and Deepwater Techology: 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.
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. A actually contains three different test methods for determining acceptability. Link to Active This link will always route to the current Active version of the standard. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. These tests identify the minimum critical temperature needed to initiate pitting or crevice corrosion.
The values given in parentheses are for information only. They can be used as acceptance tests if criteria e. 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 tests offer a means to evaluate and compare the expected performance of various alloys.
These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. Note that these are not acceptance tests as written in G48 as there are no acceptance criteria.
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.
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. In the case of common heat treatment, this region will be that which cooled most slowly.
A9223 C through F are designed as incremental tests and require multiple specimens. 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.
Recently, use of these alloys has met with challenges, many of them having to do with welding operations.
Ferric Chloride Corrosion Testing – Rolled Alloys, Inc.
Log in to your subscription Username. As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing. Proceedings of an international conference Subsea Controls ashm Data Acquisition ‘ Advanced search Show search help. 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.
This test method is designed solely for detection of the precipitation of detrimental intermetallic aatm in duplex stainless steels. Peer reviewed only Published between: 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 a9223 use.
The pH is adjusted to 1. Proceedings of an international conference Oceanology: