摘要
利用Gleeble 3800热模拟试验机对2种TC4-x Fe合金在应变速率范围为1~10 s^(-1),变形温度介于800~950℃之间,工程应变量为60%条件下的热变形行为进行研究。通过对应力应变曲线的分析研究,建立了以变形温度、应变速率和真应力为参数的本构方程。TC4-0.18Fe和TC4-0.55Fe合金计算得到的变形激活能分别为550.77和420.57 k J/mol。基于动态材料学模型,构造出合金在真应变为0.92下各自的加工图,借此来评估合金的流变失稳区并优化相应的工艺参数。结果表明:这2种合金的理想加工条件为950℃/5~10 s^(-1),功率耗散效率分别为0.52和0.47。
Hot deformation behavior of two kinds of TC4-x Fe alloys have been investigated by a Gleeble 3800 thermal simulator in the strain rate range of 1~10 s^(-1) and deformation temperature range of 800~950℃with height reduction of 60%.Based on the analysis of the stress-strain curves,two constitutive equations have been obtained,using deformation temperature,strain rate and flow stress as parameters.The calculated apparent activation energies are 550.77 k J/mol for TC4-0.18Fe alloy and 420.57 k J/mol for TC4-0.55Fe alloy.In order to evaluate the flow instability areas and optimize relevant processing parameters,two processing maps were constructed at the true strain of 0.92 based on dynamic material model.The results show that the optimal processing condition with peaks in power dissipation of 0.52 and 0.47 is temperature of 950℃and the strain rate of 5~10 s^(-1).
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2017年第S1期204-210,共7页
Rare Metal Materials and Engineering
基金
江苏省材料科学工程优势学科(PAPD)
国家国际科技合作专项(2015DFA51430)
国家材料环境腐蚀平台
关键词
钛合金
热变形行为
本构方程
加工图
titanium alloys
hot deformation behavior
constitutive equation
processing map
