40Cr调质钢高速冷滚打热力耦合数值模拟  

Research on Coupled Thermo-Mechanical Numerical Simulation of High Speed Cold Rolling for 40Cr Quenched and Tempered Steel

作　　者：张丰收[1] 姚海波[2] 崔凤奎[2] 朱文娟[2] 

机构地区：[1]河南科技大学医学技术与工程学院,洛阳471003 [2]河南科技大学机电工程学院,洛阳471003

出　　处：《机械工程材料》2014年第8期101-107,共7页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51075124)

摘　　要：在分析高速冷滚打成形原理的基础上,建立了热力耦合数学模型,通过常温和高温下不同应变速率的静态和动态压缩试验,结合Johnson-Cook流动应力公式,建立了40Cr调质钢的本构模型;利用有限元软件对40Cr调质钢高速冷滚打成形进行数值模拟,在考虑加工硬化与动态软化的综合效应下,获得了工件应力、应变和温度的分布,探讨了冷滚打成形过程中热力耦合形成的原因及成形速率对热效应的影响,并用试验进行了验证。结果表明:工件的温度分布和等效塑性应变分布是不均匀的,剧烈应变区的等效塑性应变高,温升高,难变形区的等效塑性应变低,温升低;试验结果证明了模拟分析的正确性。On the basis of analyzing the principle of high speed cold rolling forming, the mathematical model of thermo-mechanical coupling was established. Combining static and dynamic compression tests with different strain rates at room temperature or high temperature and the application of Johnson-Cook flow stress formula, the constitutive model of 40Cr quenched and tempered steel was established. Using finite element software, high speed cold rolling forming of 40Cr quenched and tempered steel was simulated. In considering the combined effect of work hardening and dynamic softening, the distribution of the stress, strain and temperature were obtained to discuss the forming reasons for thermo-mechanical coupling in cold roll process, and the influence of forming rate on thermal effect. Finally, verification test was carried out. The results show that the temperature distribution and equivalent plastic strain of the workpiece were not evenly distributed. In intense strain region, the equivalent plastic strain was relatively large and the temperature rising was high. In hard deformation zone, the equivalent plastic strain was small and temperature rising was low. The experimental results proved the correctness of the simulation.

关 键 词：高速冷滚打 热力耦合 40Cr调质钢 

分 类 号：TG146.1[一般工业技术—材料科学与工程]