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C级钢因其优越的机械性能而广泛应用于火车车轮、车钩等重要零部件上。该材料零部件通常经热锻成形,因此对该材料在高温下的流动应力进行研究具有重要意义。该文采用Gleeble热力学模拟机对C级钢在温度为1 050～1 250℃、应变速率为0.01～10 s-1条件下的流动应力进行测试,获得C级钢的流动应力数据以及C级钢在不同热变形条件下的峰值及稳态流动应力。实验结果预测了C级钢存在动态再结晶现象,得到了变形温度、应变速率和变形程度对C级钢流变应力的影响规律。基于Sellers-Tegart方程拟合本构参数,包括应力水平参数、应力指数、变形激活能和结构因子,建立了C级钢的本构关系式,可作为C级钢零部件热成形加工工艺选择和参数确定的依据,同时也可作为C级钢零部件锻造工艺数值模拟的基础数据。
C-class steel because of its superior mechanical properties and widely used in train wheels, coupler and other important parts. The material parts are usually formed by hot forging, so it is of great significance to study the flow stress of the material at high temperature. In this paper, Gleeble thermodynamic simulator was used to test the flow stress of C steel under the conditions of temperature of 1 050 ~ 1 250 ℃ and strain rate of 0.01 ~ 10 s-1. The flow stress data of C steel and C steel Peak and steady-state flow stress under different thermal deformation conditions. The experimental results predict the dynamic recrystallization of C steels, and the influence of deformation temperature, strain rate and degree of deformation on the flow stress of C steels has been obtained. Based on the Sellers-Tegart equation, the constitutive parameters, including the stress level parameters, stress exponent, deformation activation energy and structural factors, are fitted to constitutive equations of C-type steels, which can be used as thermoforming process for C- Parameters to determine the basis, but also can be used as C-class steel forging process numerical simulation of the basic data.