对于需要进行淬火加回火处理的结构钢,各国工业上都有“奥氏体晶粒度测定方法”的标准。这些标准大同小异,它们主要区别在于图1所示的加热温度(T_1)及保温时间(t_1)。从图1可以看出,检查奥氏体晶粒度的热处理(CD),其“终态”D的奥氏体晶粒度,不仅受CD段的影响,也受“始态”C的控制。因此,为了理解和控制 For the need to quench and tempering the structural steel, the industrial countries have “austenite grain size determination method ” standard. These criteria are much the same, and their main difference is the heating temperature (T_1) and holding time (t_1) shown in Figure 1. It can be seen from Fig. 1 that the austenite grain size of the austenite grain size for the heat treatment (CD) of the austenite grain size is not only affected by the CD segment, but also influenced by the initial state "C’s control. Therefore, for understanding and control