在Gleeble-1500热模拟试验机上,当应变速率为0.001~10 s-1、变形温度为700~900℃时,采用高温压缩试验对Ti-55531钛合金热压缩变形中流变应力行为进行研究。研究结果表明,两相区变形时,曲线呈动态再结晶型,单相区变形时,曲线呈动态回复型。流变应力随着变形温度的升高而降低,随应变速率的提高而增大。采用双曲正弦模型确定该合金的变形激活能,两相区变形激活能为407.75 k J·mol-1,单相区变形的形变激活能为157.97 k J·mol-1,建立了两相区和单相区变形的本构方程。误差分析表明,流动应力计算值与试验值之间的相对误差小于10%,所建立的本构关系能比较精确地描述Ti-55531钛合金热加工过程中的流动行为。
【英文摘要】
The flow stress behavior of titanium alloy Ti55531 during hot compression deformation was studied by high temperature compression test at the deformation temperature 700- 900 ℃ and the strain rate 0. 001- 10 s- 1on the Gleeble- 1500 press. The results show that the curve at( α + β) phase is of re-crystallization,while the curve at β phase is of dynamic recovery. The flow stress decreases with the increase of deformation temperature but increases with the increasing strain rate. Its deformation activation en...
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