NF EN ISO 643

NF EN ISO 643

April 2013
Standard Cancelled

Steels - Micrographic determination of the apparent grain size

ISO 643:2012 specifies a micrographic method of determining apparent ferritic or austenitic grain size in steels. It describes the methods of revealing grain boundaries and of estimating the mean grain size of specimens with unimodal size distribution. Although grains are three-dimensional in shape, the metallographic sectioning plane can cut through a grain at any point from a grain corner, to the maximum diameter of the grain, thus producing a range of apparent grain sizes on the two-dimensional plane, even in a sample with a perfectly consistent grain size.

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Main informations

Collections

National standards and national normative documents

Publication date

April 2013

Number of pages

44 p.

Reference

NF EN ISO 643

ICS Codes

77.040.99   Other methods of testing of metals

Classification index

A04-102

Print number

1 - 12/03/2013

International kinship

ISO 643:2012

European kinship

EN ISO 643:2012
Sumary
Steels - Micrographic determination of the apparent grain size

ISO 643:2012 specifies a micrographic method of determining apparent ferritic or austenitic grain size in steels. It describes the methods of revealing grain boundaries and of estimating the mean grain size of specimens with unimodal size distribution. Although grains are three-dimensional in shape, the metallographic sectioning plane can cut through a grain at any point from a grain corner, to the maximum diameter of the grain, thus producing a range of apparent grain sizes on the two-dimensional plane, even in a sample with a perfectly consistent grain size.

Replaced standards (1)
NF EN ISO 643
April 2003
Standard Cancelled
Steels - Micrographic determination of the apparent grain size

Le présent document spécifie la méthode de détermination micrographique de la grosseur du grain ferritique ou austénitique apparente des aciers. Il précise les méthodes de mise en évidence du grain et d'estimation de la grosseur moyenne du grain d'un échantillon ayant une distribution granulométrique unimodale.

Standard replaced by (1)
NF EN ISO 643
January 2020
Standard Cancelled
Steels - Micrographic determination of the apparent grain size

This document specifies a micrographic method of determining apparent ferritic or austenitic grain size in steels. It describes the methods of revealing grain boundaries and of estimating the mean grain size of specimens with unimodal size distribution. Although grains are three-dimensional in shape, the metallographic sectioning plane can cut through a grain at any point from a grain corner, to the maximum diameter of the grain, thus producing a range of apparent grain sizes on the two-dimensional plane, even in a sample with a perfectly consistent grain size.

Table of contents
  • Avant-propos
    iv
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    1
  • 4 Symboles et termes abrégés
    2
  • 5 Principe
    2
  • 6 Sélection et préparation de l'échantillon
    5
  • 6.1 Prélèvement
    5
  • 6.2 Mise en évidence des joints de grains ferritiques
    5
  • 6.3 Mise en évidence des joints de grains austénitiques et préausténitiques
    5
  • 7 Caractérisation de la grosseur de grain
    10
  • 7.1 Caractérisation par un indice
    10
  • 7.2 Caractérisation par la méthode du segment intercepté
    11
  • 8 Rapport d'essai
    15
  • Annexe A (informative) Résumé des méthodes de mise en évidence des joints de grains ferritiques, austénitiques et préausténitiques dans les aciers
    16
  • Annexe B (normative) Détermination de la grosseur de grain - Images types extraites de l'ASTM E112
    17
  • Annexe C (normative) Méthode d'évaluation
    32
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