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含 0 .32 %C、0 .88%Mn、0 .99%Si、0 .9%Ni、0 .9%Cr的钢在 775～ 870℃间不同临界温度下退火并油冷 ,形成双相钢显微结构。对试样进行抗拉试验 ,得到一系列抗拉和延伸性能的数据。抗拉强度随着退火温度的升高而增高 ,马氏体比率随着延展性降低而升高。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 ,从马氏体晶粒的结合力丧失到晶间和穿晶断裂 ,后一种形态为试样的最终失效形式。
The steel containing 0.32% C, 0.88% Mn, 0.99% Si, 0.9% Ni, 0.9% Cr was annealed and oil-cooled at different critical temperatures between 775 and 870 ° C to form a dual phase Steel microstructure. Tensile test specimens to obtain a series of tensile and elongation properties of the data. Tensile strength increases with increasing annealing temperature, and the martensite ratio increases with decreasing ductility. Micropores form near the fracture surface. The morphology of the micropores changes with the ratio of martensite, the loss of bond strength of the martensite grains to the intergranular and transgranular fracture, the latter being the final failure form of the specimen.