采用Gleeble3800热模拟机、MTS拉伸实验机、LEO1450携带EBSD系统的扫描电镜与高倍电镜等对TRIP800进行了组织性能考察，并对其形变过程裂纹走向与断裂机理进行了观察分析。结果表明，实验钢退火加热温度为840 ℃，保温120 s后获得最优力学性能。其残余奥氏体晶粒主要分布在晶界处，且尺寸在3 μm以下。原位拉伸时，当试样裂纹尖端遇到残余奥氏体时，应力集中促使马氏体转变，裂纹尖端被钝化，产生TRIP效应。最后，试样断口中部为剪切断裂，边部为塑性断裂。
The microstructure, crack and fracture mechanism of 800 MPa grade transformation induced plasticity steels were researched by using Gleeble3800 thermal simulator, MTS stretching test machine, LEO1450 with EBSD system and high power electron microscope. The results showed that trialproduced steel annealed at 840 ℃ for 120 s showed optimal mechanical property. The residual austenite grain mostly disperses over grain boundary, and the sizes are below 3 μm. When the tip of crack reached residual austenite, the stress concentration promoted the martensite transformation, and the tip of crack was passivated, which led to TRIP effect for in situ drawing experiment. At last, the center of sample fracture was shear fracture, and the edge was plastic fracture.
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