BS EN ISO 4499-2:2020 - Hardmetals. Metallographic determination of microstructure. Measurement of WC grain size

BS EN ISO 4499-2:2020

Hardmetals. Metallographic determination of microstructure. Measurement of WC grain size

Status : Current   Published : August 2020



This document gives guidelines for the measurement of hardmetal grain size by metallographic techniques only using optical or electron microscopy. It is intended for WC/Co hardmetals (also called cemented carbides or cermets) containing primarily tungsten carbide (WC 1


DE: Wolframcarbid, EN: tungsten carbide.

) as the hard phase. It is also intended for measuring the grain size and distribution by the linear-intercept technique.

This document essentially covers four main topics:

  1. calibration of microscopes, to underpin the accuracy of measurements;

  2. linear analysis techniques, to acquire sufficient statistically meaningful data;

  3. analysis methods, to calculate representative average values;

  4. reporting, to comply with modern quality requirements.

This document is supported by a measurement case study to illustrate the recommended techniques (see Annex A).

This document is not intended for the following:

  1. measurements of size distribution;

  2. recommendations on shape measurements. Further research is needed before recommendations for shape measurement can be given.

Measurements of coercivity are sometimes used for grain-size measurement, however, this document is concerned only with a metallographic measurement method. It is also written for hardmetals and not for characterizing powders. However, the method can, in principle, be used for measuring the average size of powders that are suitably mounted and sectioned.

Standard NumberBS EN ISO 4499-2:2020
TitleHardmetals. Metallographic determination of microstructure. Measurement of WC grain size
Publication Date12 August 2020
Normative References(Required to achieve compliance to this standard)ISO 4489:2019, ISO 6507-2, ISO 3738-2, ISO 3369, ISO 6507-3, ISO 3738-1, ISO 6507-4, ISO 6507-1
Informative References(Provided for Information)ISO 4499-4, ASTM B665, ISO 13383-1, ASTM E112, ASTM B657, ISO 4499 (all parts), ISO 4499-1
ReplacesBS EN ISO 4499-2:2010
International RelationshipsEN ISO 4499-2:2020,ISO 4499-2:2020
Draft Superseded By18/30369648 DC
DescriptorsHardmetals, Test specimens, Testing conditions, Metals, Microscopic analysis, Etching, Grain size, Carbides, Powder metallurgy, Specimen preparation, Metallography, Crystal microstructure, Alloys
Title in FrenchMétaux-durs. Détermination métallographique de la microstructure Mesurage de la taille des grains de WC
Title in GermanHartmetalle. Metallographische Bestimmung der Mikrostruktur Messung der WC Korngröße
ISBN978 0 580 52135 5
File Size2.142 MB

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