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苏联哥美里机器生产联合公司为了检查刀具的热处理质量,建立了快速分析室。高速钢的淬火质量根据奥氏体晶粒的大小确定。在工具上或者监测试样上(对于有的刀具,例如拉刀,不能做显微磨片)制备显微磨片。为了显示奥氏体晶粒,磨片经淬火后用5%硝酸酒精溶液浸蚀,而经全部热处理(淬火加三次回火)后,用4%硝酸酒精溶液浸蚀。在MM——7金相显微镜下,放大500倍观察显微磨片的组织。根据全苏工具科学研究所制订的级别,评定奥氏体晶粒的大
In order to check the heat treatment quality of the tool, a joint company of the Soviet Union Gomel Machine-Building established a rapid analysis chamber. The quenching quality of HSS is determined by the size of austenite grains. On the tool or monitor the sample (for some tools, such as broaches, can not be made of micro-grinding) microscopic grinding. In order to show the austenite grains, the polished pieces were etched with a 5% nitric acid alcohol solution after quenching and then etched with a 4% nitric acid alcohol solution after all the heat treatments (quenching plus three tempering). Under the microscope of MM - 7, magnify 500 times to observe the microstructure of the microscope. According to the All-Su tool Institute of Science and Technology level, to assess the large austenite grain