通过光镜、扫描电镜分析以及拉伸试验研究了高马氏体量双相钢(马氏体体积分数大于30%) 在不同热处理条件下的显微组织和拉伸性能，并进一步探讨了其断裂机理。结果表明，随着两相区保温温度的升高，马氏体体积分数不断升高，导致强度不断提高。马氏体体积分数较低时，钢的断裂特征为韧性断裂；马氏体体积分数较高时，则会转变为脆性断裂。微孔在断裂表面附近形成。微孔的形态随着马氏体的比率而变化，随着马氏体体积分数的升高，微孔形态从界面结合力的丧失转为微裂纹。
The microstructure, tensile properties as well as fracture mechanism of highmartensite content dualphase steel were studied by OM,SEM and tension test. Results show that with the increase of intercritical quenching temperature in (α+γ) range, the volume fraction of martensite continuously rises, enhanceing the strength of the steel. In addition,the volume fraction of martensite exhibits a certain influence on transformsation from ductile to brittle fracture. Finally, microscopic holes are formed near the fracture surface,the morphology of which is changed with the increase of volume fraction of martensite.
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