硬质合金 - 微观组织的金相测定 - 第2部分:Wc晶粒尺寸的测量

[中文适用范围]： 本文件提供了仅使用光学或电子显微镜通过金相技术测量硬质合金晶粒尺寸的指南。 它适用于主要含有碳化钨 (WC1)）作为硬质相的 WC/Co 硬质合金（也称为硬质合金或金属陶瓷）。 它还用于通过线性截距技术测量晶粒尺寸和分布。 本文件主要涵盖四个主要主题： ——显微镜校准，以支持测量的准确性； ——线性分析技术，以获得足够的统计上有意义的数据； ——分析方法，计算代表性平均值； ——报告，以符合现代质量要求。 本文件由测量案例研究支持，以说明推荐的技术（见附件 A）。 本文件不适用于以下用途： ——尺寸分布的测量； ——关于形状测量的建议。 在给出形状测量建议之前还需要进一步研究。 矫顽力的测量有时用于晶粒尺寸测量，然而，本文件仅涉及金相测量方法。 它也是为硬质合金而编写的，而不是为表征粉末而编写的。 然而，该方法原则上可用于测量适当安装和切片的粉末的平均尺寸。 [外文原描述]： This document gives guidelines for the measurement of hardmetal grain size by metallographic techniques only using optical or electron microscopy. It is intended for WC/Co hardmetals (also called cemented carbides or cermets) containing primarily tungsten carbide (WC[1]) as the hard phase. It is also intended for measuring the grain size and distribution by the linear-intercept technique. This document essentially covers four main topics: — calibration of microscopes, to underpin the accuracy of measurements; — linear analysis techniques, to acquire sufficient statistically meaningful data; — analysis methods, to calculate representative average values; — reporting, to comply with modern quality requirements. This document is supported by a measurement case study to illustrate the recommended techniques (see Annex A). This document is not intended for the following: — measurements of size distribution; — recommendations on shape measurements. Further research is needed before recommendations for shape measurement can be given. Measurements of coercivity are sometimes used for grain-size measurement, however, this document is concerned only with a metallographic measurement method. It is also written for hardmetals and not for characterizing powders. However, the method can, in principle, be used for measuring the average size of powders that are suitably mounted and sectioned. [1] DE: Wolframcarbid, EN: tungsten carbide.