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研究了WB36钢临界再热粗晶区(IRCGHAZ)网状组织的构成、形成机理及对韧性的影响。结果表明,网状组织主要由颗粒状M-A组元和粒状贝氏体构成,其形成是由于一次粗晶区受到峰值温度在AC1～AC3的再次热循环作用时,晶界附近在加热过程中发生无序奥氏体转变,形成富碳的细小球形奥氏体,它们冷却时转变为粒状M-A组元和贝氏体。网状组织所在的IRCGHAZ韧性最低,但含有较多M-A组元的网状组织并不是导致IRCGHAZ脆化的主要原因,晶内板条件间形成的方向性排列的条状M-A组元直接导致了IRCGHAZ的脆化,这是由于条状M-A组元比颗粒状M-A组元更容易促进解理方式断裂。
The formation, formation mechanism and toughness of WB36 steel reheat coarse grain (IRCGHAZ) network were studied. The results show that the reticular structure mainly consists of granular MA elements and granular bainite. The formation of the reticular structure is caused by the reheat cycle of the peak temperature at AC1 ~ AC3 once in the coarse grain region and the heating in the vicinity of the grain boundary Unordered austenite transformation, the formation of carbon-rich small spherical austenite, they cooled into granular MA components and bainite. The reticulate structure is the one with the lowest IRCGHAZ toughness. However, the reticulate structure with more MA elements is not the main reason leading to the IRCGHAZ embrittlement. The directional MA elements formed between the in-plane plates directly lead to IRCGHAZ Because of the easier cleavage cleavage of the cleaved MA elements than the granular MA elements.