基于高温拉伸与压缩实验的LZ50车轴钢热加工图研究

Study on hot processing maps of LZ50 axle steel based on high temperature tension and compression experiments

为优化LZ50车轴钢热加工工艺参数,通过热模拟试验机对LZ50车轴钢进行了热拉伸与热压缩实验,分别确定了拉伸与压缩时的峰值应力本构模型,并基于高温拉伸与压缩实验构建了材料的热加工图。结果表明,建立的拉伸与压缩峰值应力模型平均绝对误差分别为3.33%和3.65%,具有可靠性;综合分析LZ50车轴钢拉伸与压缩的热加工图发现,拉伸变形时选取高温低应变速率区域,即变形温度1040~1100℃,应变速率0.1 s^(-1)为LZ50车轴钢最优热加工区域;压缩时真应变为0.6,采用低温高应变速率,即变形温度900~950℃,应变速率1~10 s^(-1)为LZ50车轴钢的最优热加工区域。

To optimize the hot working process parameters of LZ50 axle steel,the hot tensile and hot compression experiments of LZ50 axle steel were carried out by thermal simulatior,and the peak stress constitutive models of tensile and compression were determined,respectively.Based on the high temperature tension and compression experiments,the hot processing maps of LZ50 axle steel were constructed.The results show that the average absolute errors of the tensile and compressive peak stress models are 3.33%and 3.65%,respectively,which are reliable.Through comprehensive analysis of the hot processing maps of LZ50 axle steel in tension and compression,it is found that the optimal hot processing area of LZ50 axle steel is selected at high temperature and low strain rate during tensile deformation,that is,the deformation temperature is 1040-1100℃and the strain rate is 0.1 s^(-1).When the true strain is 0.6 under compression,the low temperature and high strain rate are adopted,that is,the deformation temperature of 900-950℃,and the strain rate of 1-10 s^(-1) is the optimal hot processing area of LZ50 axle steel.