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应用透射电子显微术研究淬火过程及拉伸加载过程,低碳马氏体钢中形成的显微组织。淬火的马氏体中出现形变带。随着拉伸变形度的增加,自回火碳化物界面放出位错,在碳化物周围形成位错缠结。在马氏体晶条界附近及整个容积中均形成高密度的位错缠结。马氏体晶条拉长、弯曲和扭转。所有这些变化都是加工硬化的重要根源。钢的断裂单元主要是马氏体晶条。
Transmission electron microscopy was used to study the microstructure in the quenching process and the tensile loading process and in low carbon martensitic steel. Quenched martensitic deformation zone appears. With the increase of tensile deformation, dislocations are released from the interface of self-tempering carbides and dislocations are formed around the carbides. High-density dislocation tangles are formed near the martensite grain boundaries and throughout the volume. Martensite elongated, bent and twisted. All of these changes are important sources of work hardening. The fracture unit of steel is mainly martensite.