Flow Stress Behavior and Microstructural Evolution of Cast TA24 Titanium Alloy During Hot Deformation
Samples of cast TA24(Ti-3Al-2Mo-2Zr) alloy were compressed in α+β phase region on a gleeble 1500 simulator. Compression tests were carried out in the temperature range of 600~800℃ .strain rate range of 0. 01-1 s-1 and height reduction of 20％ —80％. The experimental results show that the flow stress behavior can be described by an exponential law at above deformation conditions. All flow stress increase with the decrease of temperature and increase of strain rate. The hot deformation activation energy (Q) derived from the experimental data is 582. 76 klmol-1 at the α+β phase region. Microstructures of compressed samples in water-quenched conditions were critically observed. Deformation mechanisms have been elucidated in the α+β phase region. The softening mechanism of the TA24 alloy hot compressed at 600—800 ℃ is dynamic recrystallization. The influences of hot working parameters on the flow stress behavior and microstructure features of cast TA24 alloy, especially on the type of phase, the morphologies and so on are analyzed. The volume fraction and grain size prior a of both decrease with the increase of deformation extent, temperature and has little relationship with strain rate. Cast structure was gradual broken,and the grain size is the smallest for the alloy deformed with 80％ height reduction. The recommended deformation extent for spinning pipe of cast TA 24 alloy should be not less than 80％.
Hot spinning titanium alloy flow softening deformation activation energy (Q)
Su Hangbiao Yang Yingli Guo Dizi Wu Jinping Zhao Hengzhang Zhao Bin Luo Yuanyuan
Northwest Institute for Nonferrous Metal Research,Xian 710076,China
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1119-1123
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）