摘要
TC17钛合金的热压试验在Gleeble-1500型热模拟试验机上进行。试验结果表明,随着变形温度升高或应变速率降低,TC17合金流动应力显著降低。在α+β两相区,TC17合金流动应力-应变曲线在高应变速率条件下出现明显流动软化特征;在β单相区,当应变速率较高时,TC17合金的流动应力-应变曲线在峰值应力附近出现振荡;基于Arrhenius方程,考虑应变对材料参数Q、n和A的影响,建立了TC17合金流动应力模型;该流动应力模型计算值与实验值之间的相对误差平均值为5.37%,表明该模型可为TC17合金的热加工提供依据。
The isothermal compression te sts of TC17 alloy were conducted on Gleeble-1500 thermal-mechanical simulator machine. The results reveal that the flow stress of TC17 alloy decreases remarkably with an increase in deformation temperature or a decrease in strain rate. When the strain rate is relatively high （1.0 s-1 and 10.0 s-l）, the flow softening feature of flow curves is observed at a＋ two-phase region, while the flow stress fluctuates after reaching a peak value at single-phase region. The flow stress model for characterizing the flow stress was established by considering the effect of strain on the material parameters. The average relative error between the calculated and experimental results is 5.37%, which indicates that the flow stress model can provide theoretical basis for hot-forming processing of TC17 alloy,
出处
《热加工工艺》
CSCD
北大核心
2013年第22期73-76,共4页
Hot Working Technology
关键词
TC17合金
高温变形
流动应力模型
TC 17 alloy
high temperature deformation
flow stress model
