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用20CrMnTi钢研究了退火组织的加热转变。结果得出,转变温度低时,奥氏体的核在铁素体/铁素体、铁素体/珠光体界面以及珠光体团界形成;转变温度高时,奥氏体核也可在珠光团内的铁素体/渗碳体界面上形成。对加热转变时形成的魏氏奥氏体进行了较系统的观察。结果发现,在铁素体/珠光体界面形成的奥氏体的核有可能向铁素体长成魏氏奥氏体;在铁素体/铁素体界面形成的奥氏体核有可能向一侧,也有可能向二侧长成魏氏奥氏体。在魏氏奥氏体的边缘观察到了台阶,可以认为魏氏奥氏体是通过台阶机制形成的。
The heating transformation of annealed tissue was investigated with 20CrMnTi steel. The results show that the transformation temperature is low, the austenite nuclei in the ferrite / ferrite, ferrite / pearlite interface and the formation of pearlite community; high transformation temperature, the austenite nuclei can also be pearl Formation of ferrite / cementite interface within the cluster. Weiss austenite formed during the heating transformation was systematically observed. As a result, it has been found that the austenite nuclei formed at the ferrite / pearlite interface may grow into austenite to austenite to the ferrite; it is possible that austenite nuclei formed at the ferrite / One side, it is possible to grow into Wei on both sides of austenite. A step was observed at the edge of Wei’s austenite. It is believed that Wei’s austenite is formed by a step mechanism.