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 .
|Published (Last):||10 April 2015|
|PDF File Size:||16.15 Mb|
|ePub File Size:||17.92 Mb|
|Price:||Free* [*Free Regsitration Required]|
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. 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.
The values given in parentheses are for information only. It is the responsibility of the user aztm this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Alloy material tested in a 6 wt. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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. As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing.
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 forms of corrosion not associated with the precipitation of intermetallic phases see Note 4. Recently, use of these alloys has met with challenges, many of them having to do with welding operations. This abstract is a brief summary of the referenced standard.
Log in to your subscription
Astmm presence of these phases a93 detrimental to toughness and corrosion resistance. This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels.
A92 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. Active view current version of standard. Proceedings of an International Conference Submersible Technology: Proceedings of an international conference Oceanology: B The acceptable minimum impact energy shall be agreed upon by seller and purchaser.
These tests offer a means to evaluate and compare the expected performance of various alloys. These tests identify the minimum critical temperature needed to initiate pitting or crevice corrosion. Link to Active This link will always route to the current Active version of the standard.
The pH is adjusted to 1. 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. Peer reviewed only Published between: They can be used as acceptance tests if criteria e. It is well known that the precipitation of intermetallics such as sigma phase and chi phase can w923 loss of toughness, and loss of awtm resistance. It is the responsibility of the user of asm standard to establish awtm safety and health practices and determine the applicability of regulatory aa923 prior to use.
Log in to your subscription Username. 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. Because of the wide experience astk the production testing of duplex alloys, testing in accordance with A is recommended. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece.
Link to Active This link will always route to the current Active version of the standard. Historical Version s – view previous versions of standard. 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 There are no acceptance criteria for any alloys.
A Energy for a full-size specimen. Methods C through F are designed as incremental tests and require multiple specimens. 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.
Advanced search Show search help. North America Asia Europe Tools. The values given in parentheses are for information only.
Except for rapidly cooled material, it may be necessary to sample from a location determined to be asfm most slowly cooled for the material piece to be characterized.
The presence of these phases is detrimental to toughness and corrosion resistance.
Ferric Chloride Corrosion Testing – Rolled Alloys, Inc.
Publishers Content Coverage Privacy. However, these parameters can be modified to suit individual test needs. 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.
Test Method C in A is a ferric chloride pitting test. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures.