一种锻造斗齿用低合金耐磨钢热变形行为

发布时间：2018-02-15 21:36

本文关键词： 低合金耐磨钢本构方程锻造挖掘机斗齿高温热变形行为　出处：《锻压技术》2017年02期 　论文类型：期刊论文

【摘要】：为研究一种锻造斗齿用新型低合金耐磨钢高温热变形行为,采用Gleeble-1500D热模拟试验机对其试样进行等温压缩试验,获取在变形温度为1173~1473 K、应变速率为0.01~10 s-1下的真应力-真应变曲线,对高温流动应力特征进行研究,分析了高温热变形行为的物理本质,拟合计算材料本构方程中的参数值,为斗齿锻造成形工艺的数值模拟提供材料性能数据。研究结果表明:热变形温度区间内,当应变速率一定时,该材料的流动应力随着变形温度的升高而减小;当变形温度一定时,该材料的流动应力随着应变速率的增大而增大;本构方程能够比较精确地描述材料在热变形过程中的流动应力,预测值与实验值的平均相对误差为2.29%,最大仅为5.37%。
[Abstract]:In order to study the high temperature hot deformation behavior of a new type of low alloy wear-resistant steel for forging bucket teeth, the isothermal compression tests were carried out on the specimens by Gleeble-1500D thermal simulation machine. The true stress-true strain curves were obtained at the deformation temperature of 1173 ~ 1473 K and the strain rate of 0.01 ~ 10 s ~ (-1). The characteristics of flow stress at high temperature are studied, the physical nature of thermal deformation behavior at high temperature is analyzed, and the parameter values in constitutive equation of materials are fitted and calculated. The results show that the flow stress of the material decreases with the increase of deformation temperature when the strain rate is constant in the range of hot deformation temperature. When the deformation temperature is fixed, the flow stress of the material increases with the increase of strain rate, and the constitutive equation can accurately describe the flow stress of the material during hot deformation. The average relative error between the predicted value and the experimental value is 2.29 and the maximum is only 5.37.
【作者单位】：郑州机械研究所;
【基金】：郑州市科技重大专项资金(152PZDX007)
【分类号】：TG142.1

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