论文部分内容阅读
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 and tensile properties of high martensite dual phase steel (martensite volume fraction> 30%) under different heat treatment conditions were studied by light microscope, scanning electron microscope and tensile test. Fracture mechanism. The results show that with the increase of holding temperature in two-phase zone, the volume fraction of martensite increases continuously, resulting in the continuous increase of the strength. When the volume fraction of martensite is low, the fracture characteristic of steel is ductile fracture; when the volume fraction of martensite is high, it will transform into brittle fracture. Micropores form near the fracture surface. The morphology of micropores changes with the ratio of martensite. With the increase of volume fraction of martensite, the morphology of micropores changes from the loss of interfacial bonding force to microcracks.