BS EN ISO 4499-2-2010 硬质合金.显微组织的金相学测定.WC晶粒尺寸的测量

标准号：BS EN ISO 4499-2-2010
中文标准名称：硬质合金.显微组织的金相学测定.WC晶粒尺寸的测量
英文标准名称：Hardmetals. Metallographic determination of microstructure. Measurement of WC grain size
标准类型：H24
发布日期：2010/6/30 12:00:00
实施日期：2010/6/30 12:00:00
中国标准分类号：H24
国际标准分类号：77.040.99;77.160
适用范围：This part of ISO 4499 gives guidelines for the measurement of hardmetal grain size by metallographictechniques only using optical or electron microscopy. It is intended for sintered WC/Co hardmetals (also calledcemented carbides or cermets) containing primarily WC as the hard phase. It is also intended for measuringthe grain size and distribution by the linear-intercept technique.This part of ISO 4499 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.The part of ISO 4499 is supported by a measurement case study to illustrate the recommended techniques(see Annex A).The part of ISO 4499 is not intended for the following.? Measurements of size distribution.? Recommendations on shape measurements. Further research is needed before recommendations forshape measurement can be given.Measurements of coercivity are sometimes used for grain-size measurement, but this current guide isconcerned only with a metallographic measurement method. It is also written for sintered hardmetals and notfor characterising powders. However, the method could, in principle, be used for measuring the average sizeof powders that are suitably mounted and sectioned.