摘要
在Gleeble-1500热模拟试验机上采用等温压缩试验的方法研究了Ti600合金2种状态下的热塑性变形行为,获得了合金在温度为800～1100℃,变形速率为0.001～10s-1范围内的流变应力数据,并计算了合金2种状态条件下的变形激活能Q。结果表明:不同的初始状态对合金的热变形行为有影响,经过热加工处理后的合金变形激活能比铸态条件下的变形激活能高;合金在2种状态下的变形激活能分别为:在(α+β)相区为475和644kJ·mol-1,在β区为101和239kJ·mol-1。在(α+β)相区动态再结晶是合金的主要软化机制,而在β区软化机制则以动态回复为主。
Hot deformation behavior of two different microstructures of Ti600 alloy was studied by isothermal compression test conduced on the Gleeble-1500 heat stimulation machine. Flow stress data at various temperature from 800～1100 ℃ and strain rates from 0.001 s-1 to 10 s-1 were obtained, the deformation activation energy Q of two different microstructures was calculated. The results show that the initial microstructures affect hot deformation behavior of this alloy, the heat process treated alloy has higher activation energy than the untreated alloy; the deformation activation energy of two different microstructures is 475 kJ·mol^-1 and 644 kJ·mol^-1 in （α＋β） phase region, 101 kJ·mol^-1 and 239 kJ·mol^-1 in β phase region. The flow stress curves and deformation activation energy reveal that the main softening mechanism is dynamic recrystallization in （α＋β） phase field, and dynamic recovery in β phase region.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A04期622-624,共3页
Rare Metal Materials and Engineering
基金
国家重点自然科学基金项目(50434030)资助
国家重点基础研究发展计划"973"项目(2007CB613805
2007CB613807)资助
关键词
高温钛合金
热变形
变形激活能
high temperature titanium alloy hot deformation activation energy
