摘要
为了更好地理解近β型钛合金线性摩擦焊(LFW)接头的界面连接行为,采用热压缩物理模拟的方法,以TB2近β型钛合金为研究材料,设计符合LFW工艺特点的帽形热压缩试样,在不同下压量、变形温度及应变速率条件下进行热压缩试验,研究热压缩接头的变形行为及组织演变。结果表明,热压缩过程中热压缩接头连接区(BZ)的峰值剪切应力随变形温度的降低及应变速率的增加而增大,接头BZ的宽度随变形温度和应变速率的增加而减小。接头BZ边缘由沿剪切方向变形的晶粒组成,接头BZ中心由细小的等轴再结晶晶粒组成。接头的动态再结晶机制为连续动态再结晶(CDRX),且CDRX的程度随下压量、变形温度及应变速率的增加而增大。此外,在界面剪切力的作用下接头BZ边缘形成{112}[111]织构,接头BZ中心形成{110}[001]织构。
In order to better understand the interface bonding behavior of linear friction welding(LFW)of a near-βtitanium alloy,the thermo-physical simulation for deformation behavior and microstructure evolution of a near-βTB2 titanium alloy was carried out by using hot compression tests with specially designed hat-shaped specimens under different compression displacements,temperatures and strain rates which were decoupled in the simulation process.The results show that the peak shear stress in bonding zone(BZ)during hot compression increases with decreasing deformation temperature and increasing strain rate,and the width of BZ decreases with increasing deformation temperature and strain rate.The margin of BZ has largely deformed grains,and the center of BZ has fine equaxied recrystallized grains.The mechanism of the joint is continuous dynamic recrystallization(CDRX)and the degree of CDRX in BZ increases with increasing compression displacement,deformation temperature and strain rate.In addition,{112}[111]texture forms in the margin of BZ,and{110}[001]texture forms in the center of BZ.
作者
郭震国
马铁军
杨夏炜
李文亚
陶军
李菊
Achilleas VAIRIS
Zhen-guo GUO;Tie-jun MA;Xia-wei YANG;Wen-ya LI;Jun TAO;Ju LI;Achilleas VAIRIS(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China;Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing 100024,China;Mechanical Engineering Department,University of West Attica,Athens,12241,Greece)
基金
supported by the National Natural Science Foundation of China(Nos.51675435,51875470,52074228)
the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(No.2021-TZ-01,2021-TS-07)。
关键词
线性摩擦焊
TB2近β钛合金
热物理模拟
变形行为
组织演变
织构演变
linear friction welding
TB2 near-βtitanium alloy
thermo-physical simulation
deformation behavior
microstructure evolution
microtexture evolution
