ISO 643-2024

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侵权投诉

Steels — Micrographic determination

of the apparent grain size

Aciers — Détermination micrographique de la grosseur de grain

apparente

International

Standard

ISO 643

Fifth edition

2024-08

Reference number

ISO 643:2024(en) © ISO 2024

ISO 643:2024(en)

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















www.iso.org



ISO 643:2024(en)

Foreword ....................................................................................................................................................................................................................................................iv

1 Scope ............................................................................................................................................................................................................................................. 1

2 Normative references ................................................................................................................................................................................................. 1

  ................................................................................................................................................................................................ 1

  ........................................................................................................................................................................................................................... 

  ........................................................................................................................................... ............................................................................. 2

4 Symbols ...................................................................................................................................................................................................................................... 2

5 Principle ........................................................................................................................................... ......................................................................................... 3

6 Selection and preparation of the specimen......................................................................................................................................... 5

  ...........................................................................................................................................................................................................5

  .................................................................................................................................................5

  ......................................................................................5

  .....................................................................................................................................................................................................5

7 Characterization of grain size ........................................................................................................................................................................... 6

  ........................................................................................................................................................................................................................ 6

  ......................................................................................................................................................6

     .................................................................................................................................................................................................6

  .......................................................................................................................................................... 6

  .......................................................................................................................................................................................6

  ........................................................................................................................................................................................

  ........................................................................................................................................................................................... 

  ................................................................................................................................................................................................. 

  ........................................................................................................................................................

  .................................................................................................................................................. 

  ............................................................................................................................................................. 

  ..................................................................................................................................................................................................

8 Test report ........................................................................................................................................................................................................................... 17

Annex A  Methods for revealing austenitic or prior-austenitic grain boundaries in

steels .......................................................................................................................................................................................................................................... 18

Annex B  Determination of grain size with standard comparison charts .........................................23

Annex C  Evaluation method ........................................................................................................................................................... 35

Annex D  .......................................................................... 37

Annex E  Grains of different size indices ............................................................................................................................ 40

Bibliography .........................................................................................................................................................................................................................................46

iii

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摘要：

ISO 643-2024 是国际标准化组织最新发布的关于钢的显微组织测定标准，主要规范了铁素体或奥氏体晶粒度的评定方法。该标准替代了旧版 ISO 643-2019，适用于碳钢、合金钢及不锈钢的金相分析，涵盖比较法、面积法和截距法等多种晶粒度测量技术。本标准通过规定试样制备、侵蚀方法及显微镜观察流程，确保钢铁材料晶粒度评定的准确性和重复性，是材料科学、冶金工程及质量检测领域的重要参考依据。对于从事金属材料性能评估、失效分析及工艺优化的专业人员，掌握 ISO 643-2024 的最新要求有助于提升检

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