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采用阶梯试样轧制,研究了热轧过程中变形量和变形温度对NM360钢再结晶规律及混晶的影响。结果表明,增大变形量和提高变形温度均有利于奥氏体组织的均匀性;绘制再结晶区域图,变形量为60%时,NM360实验钢完全再结晶临界温度为1070℃,未再结晶临界温度为900℃;由于高含量Nb对奥氏体再结晶的强烈阻滞作用,实验钢完全再结晶、未再结晶临界温度大幅度提高;为获得优异的NM360钢组织性能,实验钢应在完全再结晶区进行轧制。
The effect of deformation and deformation temperature on recrystallization and mixed crystal of NM360 steel was studied by using step specimen rolling. The results show that increasing the deformation and increasing the deformation temperature are beneficial to the homogeneity of the austenite structure. When the amount of deformation is 60%, the critical recrystallization temperature of the NM360 steel is 1070 ℃ and the recrystallization area is not recrystallized The critical temperature is 900 ℃. Due to the strong retardation of high content of Nb on recrystallization of austenite, the experimental steel recrystallizes completely and the critical temperature of non-recrystallization increases greatly. In order to obtain the excellent microstructure and properties of NM360 steel, Complete recrystallization zone is rolled.