ASTM-B276 Standard Test Method for Apparent Porosity in Cemented Carbides

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Standard Test Method for Apparent Porosity in Cemented Carbides



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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.

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.


apparent porosity; cemented carbides; hardmetals; microstructure; powder metallurgy ;; ICS Number Code 77.160 (Powder metallurgy)

To find similar documents by ASTM Volume:

02.05 (Metallic and Inorganic Coatings; Metal Powders and Metal Powder Products)

To find similar documents by classification:

77.160 (Powder metallurgy Including sintered metal materials and hardmetals)

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Document Number


Revision Level

2005 R15 EDITION



Modification Type


Publication Date

Nov. 1, 2015

Document Type

Test Method

Page Count

3 pages

Committee Number