Superplastic Properties of Fine Grain TIMETAL(R) 54M (Ti-5Al-4V-0.75Mo-0.5Fe)
Ti-5Al-4V-0. 75Mo-0. 5Fe alloy (Ti-54M,US Patent No. 6,786,985) is a new alloy developed at TIMET. The alloy exhibits superior machin-ability in most machining conditions and strength comparable to that of Ti-6Al-4V. The flow stress of the alloy is typically 20％~40％ lower than that of mill-annealed Ti-6Al-4V under similar test conditions, which is believed to be one of contributors to its superior machinability. Superplastic forming (SPF) properties of this alloy were investigated and a total elongation exceeding 500％ was observed at temperatures between 750℃ and 850℃ at a strain rate of 10-3/S. A steady flow behavior that indicates the occurrence of superplasticity was observed at temperature as low as 790℃ at a strain rate of 5×104/S. It is well understood that grain size is one of critical factors that influences superplasticity. Fine grain Ti-54M sheets with 2~3μm of grain size,produced in a laboratory facility,demonstrated that SPF would be possible at temperatures as low as 700℃. This paper will present superplastic behavior of fine grain Ti54M compared with Ti-6Al-4V and discuss metallurgical factors that control low temperature superplasticity.
Titanium (Ti) Ti-54M Ti-5Al-4 V-0.75Mo-0.5Fe superplasticity superplastic forming fine grain
Yoji Kosaka Phani P. Gudipati
TIMET,Henderson Technical Laboratory,P. O. Box 2128 Henderson,NV 89009 U. S. A
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1821-1825
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）