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高速钢奥氏体晶粒的大小,是评定高速钢淬火质量的主要依据。一般用4%硝酸,酒精溶液,浸蚀2～4分钟,放大500倍按“工具钢金相图谱”比较评定奥氏体晶粒度级别。
High-speed steel austenite grain size, is the main basis for assessing the quality of high-speed quenching. Generally use 4% nitric acid, alcohol solution, etching 2 to 4 minutes, 500 times magnification Press the “tool steel metallographic map” to compare the level of austenite grain size.