初始状态对Ti600钛合金热变形的影响  

Effect of Initial Condition on Hot Deformation Behavior of Titanium Alloy

作　　者：戚运莲[1] 奚正平[1] 赵永庆[1] 洪权[1] 杜宇[1] 王蕊宁[1] 罗媛媛[1] 曾卫东[2] 

机构地区：[1]西北有色金属研究院,陕西西安710016 [2]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》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

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.

关 键 词：高温钛合金 热变形 变形激活能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]