摘要
在Gleeble-3500型热模拟试验机上对A100超高强度钢进行热压缩实验,获得了在变形温度为850~1200℃,应变速率为0.001~10s -1 以及变形程度为60%条件下的流变应力曲线,分析热压缩过程中摩擦和温升效应对流变应力的影响,修正了流变应力曲线;并在Arrhenius双曲正弦函数方程的基础上引入应变量参数构建了基于应变量耦合的唯象本构模型。结果表明:随着变形温度的降低或应变速率的增加,摩擦和温升效应对流变应力的影响逐渐显著;所建立的本构模型预测值与实验值的绝对平均相对误差为4.902%,相关系数为0.99,能够用于准确预测不同应变下的流变应力。
The flow stress curves in the deformation temperature range of 850-1200℃, the strain rate of 0.001-10s -1 and the deformation degree of 60% were obtained by hot compression test of A100 ultra-high strength steel on Gleeble-3500 thermal mechanical simulator. The effect of friction and temperature rise on the flow stress during the hot compression process was analyzed, and the flow stress curves were corrected. Phenomenological constitutive model based on introducing the strain parameter was established by the Arrhenius hyperbolic sine function equation. The results show that the influence of friction and temperature rise on the flow stress is gradually obvious with the decrease of deformation temperature or the increase of strain rate. Through comparison between experimental and predicted values, the absolute average relative error is 4.902% and the correlation coefficient is 0.99. It is revealed that the established constitutive model can accurately predict the flow stress under different strains.
作者
任书杰
罗飞
田野
刘大博
王克鲁
鲁世强
REN Shu-jie;LUO Fei;TIAN Ye;LIU Da-bo;WANG Ke-lu;LU Shi-qiang(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第6期144-151,共8页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(51302255,51464035)
关键词
A100超高强度钢
流变应力曲线修正
唯象本构关系
热压缩实验
A100 ultra-high strength steel
correction of flow stress curve
phenomenological consti-tutive relationship
hot compression test
作者简介
通讯作者:罗飞(1978-),女,博士,高级工程师,研究方向:金属加工及数值模拟计算,联系地址:北京市81信箱14分箱(100095),E-mail: luofei621@163.com.
