摘要
用Gleeble-1500对Ti53311S钛合金在温度为880-1080℃，应变速率为0．001～10s^-1。最大变形量为80％的条件下进行高温压缩变形行为研究。测试了其真应力一真应变曲线，建立了本构方程，并求出变形激活能。双相区为377kJ／mol，β相区为648kJ／mol。并观察了变形后的显微组织，计算分析了该合金的加工图。结果表明：该合金对温度和应变速率敏感，不同变形条件下的应力值变化很大；应变速率敏感指数随温度的升高而降低．而变形激活能随温度的升高而增大。合金的变形机理主要为动态再结晶和动态回复。Ti53311S钛合金加工过程中温度应控制在相变点以下，应变速率应控制在0．01s^-1以上、10s^-1以下为宜。
The hot deformation behaviors of Ti53311S alloy in the temperature range of 880-1080℃and the strain rate range of 0.001-10 s^-1 were studied by using hot compressing testing on a Gleeble-1500 simulator. The flow behavior was described by the constitutive equation. The deformation activation energy of 377 kJ/mol in （α＋β） region and 648 kJ/mol in β region was calculated. The microstructure of deformed specimens was observed and the processing maps were calculated and analyzed. The results show that Ti53311S alloy is sensitive to temperature and strain rate; the sensitivity exponent of strain rate decreases with the increase of temperature, while the deformation activation energy increases with the increase of temperature; the leading deformation mechanism of Ti53311S alloy is dynamic recover and dy- namic recrystaUization; the optimum hot working conditions are that the deformation temperature is below the phase transition temperature, the strain rate is between 0.01-10 s^-1.
出处
《热加工工艺》
CSCD
北大核心
2007年第22期14-17,共4页
Hot Working Technology
基金
国家重点自然科学基金资助项目(50434030)
国家973基金资助项目(2007CB613807)
关键词
钛合金
高温压缩
本构方程
变形激活能
加工图
titanium alloy
hot deformation
constitutive equation
deformation activation energy
processing maps
作者简介
王蕊宁（1977-），女，陕西西安人，博士研究生；电话：029-86231078；E-mail：wangruining123@163．com
