复合渗碳剂、用于检测奥氏体晶粒度的渗碳方法以及奥氏体晶粒度的检测方法

本申请涉及钢热处理领域，具体而言，涉及一种复合渗碳剂、用于检测奥氏体晶粒度的渗碳方法以及奥氏体晶粒度的检测方法。复合渗碳剂包括粒径为1.0～3.0mm的第一渗碳剂和粒径为5.0～8.0mm的第二渗碳剂；其中，第一渗碳剂的质量百分数为27％～33％。本申请提供的复合渗碳剂在渗碳过程中，通过不同粒径的第二渗碳剂和第一渗碳剂相互穿插，相互填补缝隙，渗入适量的氧气量，确保活性碳原子反应形成，形成均匀稳定的渗碳氛围，使试样表面形成均匀的厚度达标的渗碳层，同时避免氧气过量导致氧化严重的问题。 The invention relates to the field of steel heat treatment, in particular to a composite carburizing agent, a carburizing method for detecting the austenite grain size and a detection method of the austenite grain size. The composite carburizing agent is prepared from a first carburizing agent with the grain size of 1.0 mm-3.0 mm and a second carburizing agent with the grain size of 5.0 mm-8.0 mm.The mass percent of the first carburizing agent is 27%-33%. In the carburizing process of the composite carburizing agent, through mutual penetrating and inserting of the second carburizing agent andthe first carburizing agent with different grain sizes, gaps are filled mutually, a proper amount of oxygen seeps, reaction formation of active carbon atoms is guaranteed, a uniform