Ti－17合金的热压缩变形行为研究  

Hot Compressive Deformation Behavior of Ti-17 Alloy

作　　者：曾卫东[1] 周义刚[1] 俞汉清[1] 孙郧立[1] 

机构地区：[1]西北工业大学,湖北汽车工业学院

出　　处：《材料科学与工艺》1996年第2期20-24,共5页Materials Science and Technology

摘　　要：通过热模拟压缩试验，测试了Ｔｉ－１７合金在温度Ｔ＝８０５～９４５℃，应变速率ε＝１０（－３）～８０ｓ（－１）、变形程度ε＝５０％范围内的真应力－应变曲线，研究了不同温度、不同应变速率下的流动应力及组织变化规律。发现，在（α＋β）两相区降低温度或提高应变速率，流动应力σ变化较大，动态再结晶易于进行；在β区通常只发生动态回复，流动应力σ随温度和应变速率变化较小，高温、低应变时发生连续再结晶。试验还用Ｚｅｎｅｒ－Ｈｏｌｌｏｍｏｎ因子确定了该台金发生连续再结晶的临界因子Ｚｃ的数值，ｌｏｇＺＣ＝４１．２。Hot compressive deformation of Ti-17(Ti-5Al-2Sn-2Zr-4Cr-4Cr-4Mo)was performed on Thermechmastor Hot-Simulater over the range of strain rate from 10(-3)to 80s(-1),deformation temperature between 1078K and 1218K.This paper focused on the dependence of flow stress and microstructure on deformation temperature and strain rate.It was found that in (α+β)region,with deformation temperature decreasing of strain rate increasing ,flow stress increased sharply and dynamic recrystallization easily occured; While in βregion, flow stress keep almost unchange when tempera.ture and strain chance. Continuous recrystallization which was proved to be associated with substructure formation due to high temperature recovery occurred at higher temperature and lower strain rate. Moreover, the critical parameter Zc (LogZc=41.2) for the occurence of continuous recrystallization was determinded.

关 键 词：动态再结晶 热压缩变形 变形行为 钛合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG111.7[金属学及工艺—金属材料]