本文件规定了使用电子背散射衍射（EBSD）定量分析钢中奥氏体的程序。本文件主要适用于中低碳钢、中低碳合金钢。 本文件用于分析晶粒尺寸大于50°的奥氏体纳米。该方法不用于量化晶粒尺寸小于50°的奥氏体nm，这会显著影响分析结果的准确性。 注意1.尺寸限制在很大程度上取决于仪器和仪器操作参数。 注意2.尺寸极限是可检测奥氏体的最小晶粒尺寸。

This document specifies procedures for quantitative analysis of austenite in steel using electron backscatter diffraction (EBSD). This document is mainly applied in low and medium carbon steels, low and medium carbon alloy steels. This document is used to analyse austenite with grain size larger than 50？nm. This method is not used to quantify austenite with grain size smaller than 50？nm, which can significantly affect the accuracy of the analysis results. NOTE？1？The size limit is strongly dependent both on the instrument and the instrument operating parameters. NOTE？2？The size limit is the minimum grain size of the detectable austenite.