摘要
采用Gleeble-3500热模拟实验机,分析6013铝合金在变形温度613~773 K、应变速率10-3~10 s-1和工程变形量10%~60%条件下的平面热压缩变形流变应力演化规律,求解热变形本构方程,建立热加工图,探讨其热变形行为机理。结果表明,6013铝合金的流变软化机制以动态回复为主;采用包含关于变形温度函数的幂函数本构方程可较好的预测其流变行为,与实测值的平均相对误差仅为6.631%;确定了单道次大应变热轧成型最佳工艺参数区间:673 K【T【773 K且5×10-3s-1【ε【10-1s-1和多道次热轧最佳工艺参数区间:633 K【T【733 K且10-1s-1【ε【1 s-1。
Hot plane strain compression deformation behavior of 6013 aluminum alloy was studied at 613-773 K,strain rate of 10- 3-10 s- 1and engineering strain 10%-60% by the Gleeble-3500 simulator. Constitutive equations incorporating the effects of temperature on material constants were developed to describe the hot deformation behavior of 6013 alloy. The processing map of the alloy was calculated and analyzed according to the dynamic materials mode( DMM). The results show that the dynamic recovery is the main softening mechanism of 6013 aluminum alloy. The developed power function constitutive equations can accurately describe the relationships among the flow stress,strain rate,temperature and the strain during hot deformation. The flow stress predicted by the constitutive equation exhibits a better agreement with the measured value with the average relative error of 6. 631%. According to the processing map,the optimum hot working domain for single pass deformation is obtained as: the temperature from 673 to 773 K and the strain rate from 5 ×10- 3to 10- 1s- 1. Meanwhile,the optimum hot working domain for multi-stage deformation is obtained as: the temperature from 633 to733 K and the strain rate from 10- 1to 1 s- 1.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第10期23-28,共6页
Transactions of Materials and Heat Treatment
基金
国家"十二五"科技支撑计划(2011BAG03B02)
国家自然科学基金(51075132)
长沙市科技重大专项(K1204008-11-1)
车身先进设计与制造国家重点实验室自主课题(61075005)
关键词
6013铝合金
平面热压缩
本构方程
热加工图
6013 aluminum alloy
hot plane strain compression
constitutive equation
processing map
