锻压技术

一种锻造斗齿用低合金耐磨钢热变形行为

英文标题：Hot deformation behavior on low-alloy high-abrasive steel used for forging bucket teeth

作者：许午阳刘华曹鋆汇吴胜超

单位：郑州机械研究所

分类号：TG314

出版年,卷(期):页码：2017,42(2):128-132

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%。

To study the hot deformation behavior of one new low-alloy high-abrasive steel used for forging bucket teeth at high temperature, isothermal compression tests were carried out by Gleeble-1500D thermal-simulation machine, and the true stress-true strain curves were obtained at temperatures 1173-1473 K and strain rates 0.01-10 s-1. Then, the flow stress characteristics at high temperature were studied, and the physical nature of hot deformation behavior was analyzed. Furthermore, the parameters of constitutive equation were obtained by fitting calculation to provide material property data for the numerical simulation of the forging process of bucket teeth. The results show that within the hot deformation temperature range, the flow stress decreases with the increase of deformation temperature at a constant strain rate, and the flow stress increases with the increase of strain rate at a constant deformation temperature. Therefore, during the hot deforming process, the flow stress of testing material can be accurately described by the constitutive equation, and the average relative error between the predicted and experimental flow stresses is 2.29% with the maximum relative error of 5.37%.

基金项目：

郑州市科技重大专项资金（152PZDX007）

许午阳（1992-），男，硕士研究生刘华（1962-），男，博士，博士生导师，研究员

参考文献：

［1］郭红, 刘英, 李卫. 挖掘机斗齿的磨损机制与选材研究[J]. 材料导报, 2014, 28(7):99-103.Guo H, Liu Y, Li W. The investigation of wear mechanism and material selection of bucket teeth on excavator [J]. Materials Review, 2014, 28(7):99-103.
［2］崔忠圻, 覃耀春. 金属学与热处理[M]. 2版. 北京: 机械工业出版社, 2007.Cui Z Q, Tan Y C. Metallography and Heat Treatment [M]. 2nd Edition. Beijing: China Machine Press, 2007.
［3］Xiao Z B, Huang Y C, Liu Y. Modeling of flow stress of 2026 Al alloy under hot compression [J]. Advances in Materials Science and Engineering, 2016,25:1-8.
［4］Wei G B, Peng X D, Fa-Ping H U, et al. Deformation behavior and constitutive model for dual-phase Mg-Li alloy at elevated temperatures [J]. Transactions of Nonferrous Metals Society of China, 2016, 26(2):508-518.
［5］Peng J, Wang Y J, Zhong L P, et al. Hot deformation behavior of homogenized Al-3.2Mg-0.4Er aluminum alloy[J]. Transactions of Nonferrous Metals Society of China, 2016, 26(4):945-955.
［6］Chen W, Guan Y P, Wang Z H. Hot deformation behavior of high Ti 6061 Al alloy [J]. Transactions of Nonferrous Metals Society of China, 2016, 26(2):369-377.
［7］孙亚丽, 谢敬佩, 郝世明,等. 30%SiCp/2024Al复合材料的热变形行为[J]. 粉末冶金材料科学与工程, 2016, 21(2):317-325.Sun Y L, Xie J P, Hao S M, et al. Hot deformation behavior of 30% SiCp/Al composite[J]. Materials Science and Engineering of Powder Metallurgy, 2016, 21(2):317-325.
［8］刘光辉, 刘华, 王伟钦,等. 316L不锈钢压缩热变形行为及临界损伤值研究[J]. 锻压技术, 2016,41(2):118-123. Liu G H, Liu H, Wang W Q, et al. Study on compressed thermal deformation behavior and critical damage value of stainless steel 316L[J]. Forging & Stamping Technology, 2016,41(2):118-123.
［9］蔺永诚, 陈明松, 钟掘. 42CrMo钢的热压缩流变应力行为[J]. 中南大学学报:自然科学版, 2008, 39(3):549-553.Lin Y C, Chen M S, Zhong J. Flow stress behaviors of 42CrMo steel during hot compression [J]. Journal of Central South University: Science and Technology, 2008, 39(3):549-553.
［10］邓小虎, 张立文, 何燕,等. 应变速率对金属动态再结晶影响的数值模拟[J]. 塑性工程学报, 2007, 14(2):24-29.Deng X H, Zhang L W, He Y, et al. Numerical simulation of strain rate on dynamic recrystallization of metal [J]. Journal of Plasticity Engineering, 2007, 14(2):24-29.
［11］Sellars C M, Tegart W J M. On the mechanism of hot deformation[J]. Acta Metallurgica, 1996, 14(9): 1136-1138.
［12］Urcola J J, Sellars C M. A model for mechanical equation of state under continuously changing conditions of deformation [J]. Acta Metallurgica, 1987, 35(11): 2659-2669.
［13］Zener C, Hollomon H. Effect of strain-rate upon plastic flow of steel[J]. Journal of Applied Physical, 1944, 15(1): 22-27.

服务与反馈：

【文章下载】【加入收藏】