ISO 643:2019 钢 表观粒度的显微测定

标准编号：ISO 643:2019

中文名称：钢 表观粒度的显微测定

英文名称：Steels — Micrographic determination of the apparent grain size

发布日期：2019-12

标准范围

本文件规定了测定钢中表观铁素体或奥氏体晶粒尺寸的显微照相方法。它描述了揭示晶界和估算单峰尺寸分布试样平均晶粒尺寸的方法。尽管晶粒是三维形状，但金相剖切面可以在从晶粒角到晶粒最大直径的任何点切割晶粒，从而在二维平面上产生一系列明显的晶粒尺寸，即使在晶粒尺寸完全一致的样品中也是如此。

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.

标准预览图