低合金耐磨钢热变形及奥氏体动态再结晶行为  

Hot Deformation and Austenite Dynamic Recrystallization Behavior of Low Alloy Wear Resistant Steel

作　　者：曹艺 王昭东[2] 邓想涛[2] 朱万军[1] CAO Yi;WANG Zhaodong;DENG Xiangtao;ZHU Wanjun(School of Metallurgical Engineering, Liaoning Institute of Science and Technology, Benxi 117004, China;State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China)

机构地区：[1]辽宁科技学院冶金工程学院,辽宁本溪117004 [2]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《热加工工艺》2018年第8期32-35,共4页Hot Working Technology

基　　金：辽宁省教育厅基金项目(L2015268);辽宁科技学院博士启动基金项目(1406B07)

摘　　要：用MM-200热模拟试验机进行高温压缩试验,研究了一种低合金高强度耐磨钢在应变速率为0.1、1及5 s-1,变形温度为800～1150℃不同条件下热变形及奥氏体动态再结晶行为。结果表明,当应变速率为0.1 s-1时,在800℃变形较难发生动态再结晶,变形温度升高,动态再结晶逐渐发生。奥氏体平均晶粒尺寸在变形温度为950℃时降到最低,此时奥氏体再结晶并未完全发生。变形温度继续升高后,动态再结晶逐渐完全,同时也伴随着晶粒的长大和粗化。通过回归分析,建立了该试验条件下低合金耐磨钢的热变形本构方程,计算得到热变形激活能为450.78 kJ/mol。The hot deformation behavior and austenite dynamic recrystallization behavior of high strength low alloy wear resistant steel were investigated by high temperature compression testing on MM-200 thermal simulator at the deformation temperature range of 800-1150 ℃ and true strain rate range of 0.1, 1 and 5 s-1. The results show that when the true strain rate is 0.1 s-1, the dynamic recrystallization of austenite is difficult to occur at the deformation temperature 800 ℃, with the increase of the deformation temperature, the dynamic recrystallization occurs gradually. When the deformation temperature increases to 950 ℃, the austenite average grain size decreases to the minimum, and then, the austenite recrystallization is incomplete. As the deformation temperature rises higher, the dynamic recrystallization is more complete, and the grains grow up and then become coarsened. The constitutive equation for hot deformation of the low alloy wear resistant steel under these test conditions can be obtained by regression analysis, and by calculation, the hot deformation activation energy is 450.78 kJ/mol.

关 键 词：低合金耐磨钢 热变形 动态再结晶 流变应力 本构方程 

分 类 号：TG142[一般工业技术—材料科学与工程] TG301[金属学及工艺—金属材料]