新型近β钛合金Ti-7333高温变形行为研究  

High-temperature Deformation Behavior of New Near-β Titanium Alloy Ti-7333

作　　者：程亮[1] 常辉[1] 樊江昆[1] 唐斌[1] 寇宏超[1] 李金山[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《钢铁钒钛》2013年第1期22-25,40,共5页Iron Steel Vanadium Titanium

基　　金：西北工业大学凝固技术国家重点实验室自主课题(37-TP-2009)

摘　　要：对新型近β钛合金Ti-7333进行等温压缩试验,并对合金的流变行为进行研究。研究结果表明:Ti-7333的流变应力对变形参数的变化十分敏感,随着温度的升高和应变速率的下降,流变应力显著减小;合金的变形以动态回复为主,动态再结晶为辅。基于Mecking和Bergstrom提出的合金热变形过程中的位错密度演变模型建立了Ti-7333合金的本构模型,准确地描述了合金热变形过程中的流变应力,并且模型中参数数量较少,便于应用。Compression tests were conducted under constant temperature to investigate the flow behavior of the new near-β titanium alloy Ti-7333. The results reveal that flow stress of the tested alloy is very sensi- tive to processing parameters. With the increase of temperatures and decrease of strain rates, the flow stress of Ti-7333 significantly decreases. The flow behavior of the alloy is dominated by dynamic recover- y, acompanied by dynamic recrystallization. In addition, based on the evolution model of dislocation den- sity put forward by Mecking and Bergstrom, a constitutive model was constructed to predicate the flow stress of Ti-7333. Due to its relatively limited parameter numbers, this model could be conveniently ap- plied to accurately describe the flow stress during thermal deformation of the alloy.

关 键 词：钛合金 热变形 流变应力 动态回复 动态再结晶 本构模型 

分 类 号：TG146.23[一般工业技术—材料科学与工程]