利用扫描电镜及其动态拉伸装置,对具有板条马氏体和铁素体双相钢组织的断裂过程进行了研究.结果表明,在拉伸应力作用下,裂纹在马氏体与铁素体界面及不同马氏体取向界面处成核,或者由于马氏体板条的断裂而产生.断裂系主裂纹钝化和微裂纹长大,最后沿强烈剪切形变带迅速连接所致.其微观形态为塑坑断口,属延性断裂机制.
An observation of the deformation and fracture behaviour of low carbonmartensite-ferrite dual-phase steel was performed using SEM with tensile-stage andautograph test machine.It was shown that the microcracks are nucleated at theinterface of martensite/ferrite and along the martensite boundaries of differentorientations,or initiated owing to the fracture of martensite laths under defor-mation of tensile stress.The cracks may propagate by the coalescence of maincrack and the growth of microcracks,then rapidly connect with each other alongthe strong shear deformation zone.Its micro-feature is appeared as the dimplefracture and seems to be of the ductile fracture mechanism.
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