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少量镍(0.12%~0.36%)可以降低焊缝粒状贝氏体转变温度、细化粒状贝氏体中的M-A组元、提高焊缝解理断裂应力,从而降低粒状贝氏体焊缝的脆性转变温度。
A small amount of nickel (0.12% ~ 0.36%) can reduce the granular bainite transformation temperature of the weld, refine the MA component in the granular bainite, improve the cleavage fracture stress of the weld and thus reduce the brittleness of the granular bainite weld Change the temperature.