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适用范围：<p>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.</p><p id="s00002">1.1 This test method specifies procedures for the metallographic determination of apparent porosity in cemented carbides. <p class="desc" id="N00001"> <span class="smallcap">Note</span> 18212;The term <span class=''unicode''>x201C;</span>apparent porosity<span class=''unicode''>x201D;</span> 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.</p> </p> <p id="s00003">1.2 <span class="italic">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.</span>