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基于Gleeble-1500热力模拟试验机测定了Fe-22Mn-0.7C TWIP钢和Q235钢700~1300℃范围内的静态拉伸行为.采用光学显微镜、扫描电子显微镜、能谱仪、电子探针微区分析等技术表征两钢种不同温度下的变形特征和断口形貌.通过分析基体化学成分、相体积分数、晶粒尺寸、凝固缺陷等因素探讨TWIP钢铸态热塑性的变化规律及其影响机制.研究结果表明,Fe-22Mn-0.7C TWIP钢700~1250℃范围内的铸态抗拉强度高于Q235,而其断面收缩率低于40%,且断口均以沿枝晶间断裂方式为主.晶粒细化和控制溶质显微偏析有利于提高TWIP钢热塑性,与基体均质性改善有关.此外,增加应变速率TWIP钢拉伸强度和断面收缩率同时增大.
The static tensile behavior of Fe-22Mn-0.7C TWIP steel and Q235 steel in the temperature range of 700 ~ 1300 ℃ was measured by Gleeble-1500 thermal simulation testing machine.The optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, Analysis and other techniques to characterize the deformation characteristics and fracture morphology of the two steels under different temperatures.Analysis of changes in the as-cast thermoplastic state of TWIP steel and its influence mechanism by analyzing the matrix chemical composition, phase volume fraction, grain size, solidification defects and other factors. The results show that the as-cast tensile strength of Fe-22Mn-0.7C TWIP steel is higher than that of Q235 in the temperature range of 700-1250 ℃ and the reduction of area is less than 40%, and the fractures are mainly along the interdendritic fracture The grain refinement and the control of solute microsegregation are conducive to improving the thermoplasticity of TWIP steel, which is related to the improvement of matrix homogeneity.In addition, the tensile strength and the reduction of area of TWIP steel increase with increasing strain rate.