Hardmetals. Metallographic determination of microstructure - Measurement of WC grain size
Hardmetals. Metallographic determination of microstructure - Measurement of WC grain size
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1 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;
— an alysis 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 ). The part of ISO 4499 is not intended for the following.
— Measurements of size distribution.
— Recommendations on shape measurements. Further research is needed before recommendations ...
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