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NEN-EN-ISO 4499-2

Hardmetals - Metallographic determination of microstructure - Part 2: Measurement of WC grain size

active, Most Current
Organization: NEN
Publication Date: 1 June 2010
Status: active
Page Count: 30
ICS Code (Other methods of testing of metals): 77.040.99
ICS Code (Powder metallurgy): 77.160
scope:

This part of ISO 4499 gives guidelines for the measurement of hardmetal grain size by metallographic techniques only using optical or electron microscopy. It is intended for sintered WC/Co hardmetals (also called cemented carbides or cermets) containing primarily WC as the hard phase. It is also intended for measuring the grain size and distribution by the linear-intercept technique. This part of ISO 4499 essentially covers four main topics: - calibration of microscopes, to underpin the accuracy of measurements; - linear analysis techniques, to acquire sufficient statistically meaningful data; - analysis methods, to calculate representative average values; - reporting, to comply with modern quality requirements. The part of ISO 4499 is supported by a measurement case study to illustrate the recommended techniques (see Annex A). Measurements of coercivity are sometimes used for grain-size measurement, but this current guide is concerned only with a metallographic measurement method. It is also written for sintered hardmetals and not for characterising powders. However, the method could, in principle, be used for measuring the average size of powders that are suitably mounted and sectioned.

Document History

NEN-EN-ISO 4499-2
June 1, 2010
Hardmetals - Metallographic determination of microstructure - Part 2: Measurement of WC grain size
This part of ISO 4499 gives guidelines for the measurement of hardmetal grain size by metallographic techniques only using optical or electron microscopy. It is intended for sintered WC/Co hardmetals...

References

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