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Standard Test Method for Apparent Porosity in Cemented Carbides
Přeložit název
NORMA vydána dne 1.9.2021
Označení normy: ASTM B276-21
Datum vydání normy: 1.9.2021
Kód zboží: NS-1049008
Počet stran: 19
Přibližná hmotnost: 57 g (0.13 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
apparent porosity, cemented carbides, hardmetals, microstructure, powder metallurgy ,, ICS Number Code 77.160 (Powder metallurgy)
Significance and Use | ||||||
4.1?Cemented carbide materials may contain small voids that, depending on the application, may affect the performance of the product. To assist users in specifying the maximum acceptable level of porosity, this test method illustrates a broad range of porosity levels for each of three porosity types. This test method is not intended to be used as a specification, but the levels shown here may be cited in specifications written by producers and users of cemented carbides. |
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1. Scope | ||||||
1.1?This test method specifies procedures for the metallographic determination of apparent porosity in cemented carbides. Note 1:?The term apparent porosity is construed to mean all
microstructures observed on a properly prepared, unetched surface,
including structures resulting from uncombined carbon, non-metallic
inclusions, etc., as well as true, inherent porosity.
1.2?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.3?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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2. Referenced Documents | ||||||
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