NF EN ISO 4499-2

NF EN ISO 4499-2

August 2020
Standard Current

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

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]) 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:— 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.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:— measurements of size distribution;— 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.[1] DE: Wolframcarbid, EN: tungsten carbide.

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Main informations

Collections

National standards and national normative documents

Publication date

August 2020

Number of pages

0 p.

Reference

NF EN ISO 4499-2

ICS Codes

77.160   Powder metallurgy

Classification index

A95-186-2

Print number

1

International kinship

European kinship

EN ISO 4499-2:2020
Sumary
Hardmetals - Metallographic determination of microstructure - Part 2 : measurement of WC grain size

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]) 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:

— 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.

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:

— measurements of size distribution;

— 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.

[1] DE: Wolframcarbid, EN: tungsten carbide.

Replaced standards (1)
NF EN ISO 4499-2
October 2010
Standard Cancelled
Hardmetals - Metallographic determination of microstructure - Part 2 : measurement of WC grain size

Le présent document donne des lignes directrices relatives au mesurage de la taille des grains de métaux-durs selon des techniques métallographiques utilisant uniquement un microscope optique ou électronique. Il est destiné aux métaux-durs WC/Co frittés (également appelés carbures cémentés ou cermets) contenant principalement du WC sous la forme d'une phase dure. Il est également destiné au mesurage de la taille des grains et de la distribution au moyen de la technique d'interception linéaire.

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes, définitions, symboles et abréviations
  • 4 Informations générales
  • 5 Appareillage
  • 6 Étalonnage
  • 7 Mesurage de la granulométrie selon la méthode d'interception linéaire
  • 8 Rapport
  • Annexe A Étude de cas de mesurage
  • Annexe B Modèle de rapport
  • Bibliographie
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