退火态TC4合金的热变形行为  

Hot Deformation Behaviour of Annealed TC4 Alloy

作　　者：熊良银[1] 吴宏斌[1] 王威[1] 蔡大勇[1] 姚枚[1] 

机构地区：[1]燕山大学材料科学与工程学院,河北秦皇岛066004

出　　处：《有色金属》2005年第1期8-11,共4页Nonferrous Metals

摘　　要：采用Gleeble-3 5 0 0热模拟机系统研究退火态TC4(Ti 6Al 4V)合金在75 0～95 0℃,应变速率0 0 0 1～1s- 1 条件下的热变形行为。TC4合金的热变形激活能约为482kJ/mol,热变形方程为ε′=2 95×10 1 9[sinh(α·σp) ] 2 4 9exp(-4 82 0 0 0 /RT)。不同真应变下的热加工图相似,随变形温度升高及应变速率降低,能量消耗效率η逐渐升高。在变形温度90 0℃左右、应变速率为0 0 0 1s- 1 时,能量消耗效率η达到峰值,约为5 8%。Hot deformation behavior of annealed TC4 alloy is investigated by means of Gleeble-3500 simulator in the temperature range of 750～950℃ and strain rate range of 0.001～1s -1. The hot deformation equation is presented as ε′=2.95×10 19[sinh(α·σ p)] 2.49exp(-482000/RT), and the apparent activation energy is about 482kJ/mol. The processing maps obtained at true strains range from 0.1 to 0.7 are essentially similar, and the efficiency of power dissipation increases gradually with the increase of temperature and decrease of strain rate. The peak of the efficiency around 58% appears at about 900℃ and 0.001s -1.

关 键 词：退火态 TC4合金 热变形 变形温度 应变速率 真应变 Ti-6Al-4V 升高 行为 能量消耗 

分 类 号：TG146[一般工业技术—材料科学与工程] TG113.253[金属学及工艺—金属材料]