摘要
针对TC4/TC17异种钛合金进行了线性摩擦焊试验,利用光学显微镜与扫描电镜对焊接接头各区域的微观组织进行了分析,并采用透射电镜分析了钛合金线性摩擦焊接头焊合区的动态再结晶规律。结果表明:在焊接升温的过程中,TC4/TC17钛合金线性摩擦焊焊缝区已经达到β转变温度。在热和力的作用下,焊缝中心处金属发生动态再结晶,生成了细小的等轴晶粒。由于焊合区在共生晶粒形成之后又经历了强塑性变形,焊合区的晶粒内部产生了高密度的位错。位错运动形成亚晶界,焊合区形成亚晶粒,并以亚晶粒为形核核心,发生动态再结晶过程。
The linear friction welding test of TC4/TC17 dissimilar titanium alloy was carried out. The microstructure of the welded joint was analyzed by optical microscope and scanning electron microscope. The dynamics recrystallization rule in weld center zone of linear friction welding joint of titanium alloy was analyzed by transmission electron microscopy. The results show that the linear friction welding zone of TC4/TC17 titanium alloy has reached the β transformation temperature during the heating process of the welding. With the effect of heat and force,dynamic recrystallization occurs at metal of weld center zone,and fine equiaxed grains generate. Since the weld center zone undergoes strong plastic deformation after the formation of symbiotic grains,high density dislocations are generated inside the grains of the weld center zone. The subgrain boundary is formed due to the motion of distocation and the subgrains are formed in weld center zone. The dynamic recrystallization process occures taking the subgrains as the nucleation core.
作者
李晓红
张彦华
张田仓
季亚娟
李赞
LI Xiao-hong;ZHANG Yan-hua;ZHANG Tian-cang;JI Ya-juan;LI Zan(School of Mechanical Engineering&Automation,Beihang University,Beijing 100191,China;Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing 100024,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第2期174-181,共8页
Journal of Plasticity Engineering
基金
国家科技重大专项(2018ZX04010001)。
关键词
钛合金
线性摩擦焊
动态再结晶
焊合区
titanium alloy
linear friction welding
dynamic recrystallization
weld center zone
