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渗碳降温直接淬火、回火处理的零件,渗层组织为针状马氏体和较多量的残余奥氏体、碳化物,经通常使用的4％硝酸酒精溶液侵蚀后,马氏体呈蓝、黑色,残余奥氏体呈白色,碳化物呈白亮色。由于残余奥氏体与碳化物颜色相似,因而给金相观察带来一定的困难,影响了对残余奥氏体和碳化物的准确评级。为了解决这一问题,我们用正交试验法选配了M2彩色侵蚀剂,成功地应用于渗碳淬、回火组织的彩色侵蚀,取得了较为理想的效果。
Carburization cooling direct quenching and tempering parts, the infiltration layer of acicular martensite and a greater amount of retained austenite, carbides, the commonly used 4% nitric acid solution after erosion, the martensite was blue , Black, residual austenite is white, carbides white bright color. As the residual austenite and carbide color similar to the metallographic observation to bring some difficulties, affecting the accurate classification of retained austenite and carbide. In order to solve this problem, we use the orthogonal test method M2 M2 color etchant, successfully applied to carburizing quenching, tempering the color erosion of the organization, and achieved a more satisfactory results.