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通过Gleeble--1500热模拟压缩试验,借助光学显微镜、扫描电镜、X射线衍射及拉伸试验等,研究一种低碳Mn--Si钢在基于热轧动态相变的热轧TRIP钢工艺和基于贝氏体等温处理工艺下的组织与力学性能,比较了通过两种工艺获得的不同复相组织状态对材料的加工硬化能力的影响.结果表明:实验钢在基于动态相变的热轧TRIP钢工艺下获得了以细晶铁素体为基体和贝氏体、残余奥氏体组成的复相组织,而在基于贝氏体等温处理工艺下得到了以板条贝氏体为基体和残余奥氏体组成的复相组织,前者中残余奥氏体含量较高且其碳含量也较高.实验钢具有以板条贝氏体为基体的复相组织时屈服强度和抗拉强度较高;但由于残余奥氏体稳定性较差,实验钢的加工硬化能力较弱,导致其均匀延伸率和总延伸率较小.
Through the Gleeble - 1500 thermal simulation compression test, the microstructure of a low carbon Mn - Si steel during hot rolling TRIP steel based on hot rolling was studied by means of optical microscope, scanning electron microscopy, X - ray diffraction and tensile test. Based on the microstructure and mechanical properties of the bainite isothermal treatment process, the effect of different complex phase states on the work-hardening ability of the materials obtained by the two processes was compared.The results show that the experimental steel is better than the hot-rolled TRIP Under the steel process, a complex phase composed of fine-grained ferrite and bainite and retained austenite was obtained. In the bainite-based isothermal treatment process, lath bainite was obtained as matrix and residual Austenite composite phase, the former high residual austenite content and high carbon content of the experimental steel with lath bainite as the matrix of complex phase when the yield strength and high tensile strength However, due to the poor stability of the retained austenite, the work hardening ability of the experimental steel is weak, resulting in a smaller uniform elongation and a smaller total elongation.