钢 表观晶粒尺寸的显微测定

[中文适用范围]： 本文件规定了确定钢中铁素体或奥氏体表观晶粒尺寸的显微方法。它描述了揭示晶粒边界和估计具有单峰尺寸分布的样品的平均晶粒尺寸的方法。尽管晶粒呈三维形状，但金相切面可以在从晶粒角到晶粒最大直径的任何一点切割晶粒，从而在二维平面上产生一系列表观晶粒尺寸，即使在晶粒尺寸完全一致的样品中也是如此。 [外文原描述]： This document specifies micrographic methods 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.