ASTM a 276
ASTM B276 – 05(2010) Standard Test Method for Apparent Porosity in Cemented Carbides
Significance and Use ASTM a 276 pdf
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.
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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately)
B243 Terminology of Powder Metallurgy
B665 Guide for Metallographic Sample Preparation of Cemented Tungsten Carbides
apparent porosity; cemented carbides; hardmetals; microstructure; powder metallurgy; Cemented carbides; Microscopic examination–cemented carbides; Porosity;