The Influence of Sc on Deformation Stability of Ti-6Al-4V Alloy Using Processing Map
The ingots of Ti-6Al-4V,Ti-6Al-4V-0. 3Sc and Ti-6Al4V-0. 5Sc alloys were melted twice by vacuum selfconsumable arc melting furnace. Forging of ingots started in beta-phase region and finished in high (alpha+beta) phase region. Annealing after forging was performed in low (alpha +beta) phase region for 30 minutes. Isothermal high temperature compression tests were conducted using thermal simulation machine under Ar atmosphere at 850,900,950,1000 and 1050℃ .strain rate were 0. 001s-1,0. 01s-1,0.1s-1 and 1s1,and the deformation degree was 60％. Processing maps were conducted using the dynamic material model (DMM) .explaining the relationships between constitutive deformation behavior, high temperature deformation stability and microstructures evolutioa The high temperature deformation was considered as a thermal activation process explained by using Arrhenius equation to obtain deformation activation energy. The dynamic recrystallization during high temperature deformation of alloys was observed by optical microscope (OM), which corresponded to the activation energy results for beta and (alpha+beta) phase region. Stable deformation regions were defined by using Murtys criteria. The crack of deformed samples,and localized flowing zone were observed in deformed samples. The stability and instability predicted by processing map and Murtys cri teria were in good agreement with the microstructures of high temperature deformed pancakes of alloys.
Ti-6Al-4Valloy Scandium (Sc) microstructure evolution deformation stability processing map
Xian Nie Huiqun Liu Danqing Yi Qi Gao Xianmin Li
School of Materials Science and Engineering,Central South University,Changsha,P. R. China Key Lab of Key Lab of Nonferrous Materials of Ministry of Education,Central South University,Changsha,P. R. Chi
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
645-649
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）