10mm厚TC11钛合金电子束焊接组织性能和残余应力  

Microstructure, Mechanical Properties and Residual Stress of Electron Beam Welded TC11 Alloy Joint of 10 mm Thickness

作　　者：王世清[1] 刘金合[1] 温国栋[1] 姜玉恒[1] 马正斌[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2013年第6期1150-1153,共4页Rare Metal Materials and Engineering

摘　　要：利用真空电子束焊机对TC11钛合金进行试验研究。采用光学显微镜及扫描电镜观察并分析接头不同区域的组织特征,并对焊接接头进行了显微硬度和力学性能测试,同时采用盲孔法对试样的残余应力进行测试。结果表明:TC11钛合金电子束焊接头焊缝区的组织特征为典型的柱状晶,晶粒内为交错排列细密的α′相,而热影响区组织为均匀的α′相和原始α+β转相的混合物。显微硬度与组织呈现较好的对应关系,即焊缝及热影响区的显微硬度高于母材。接头的冲击韧性比母材提高了20%,而抗拉强度为母材的98%左右。残余应力为以纵向应力为主的单向拉伸应力状态,横向残余应力数值则较小。Electron beam welding of TC11 alloy was carried out to study the microstructure, mechanical properties and residual stress of the joint. In the fusion zone, typical columnar crystals with fine martensite α′ are found, in contrast with the heat affected zone where equiaxed α and martensite α′ are dispersed in the transformed β. The microhardness of the fusion zone is higher than that of the heat affected zone and the base metal. The joint impact toughness is increased by 20%, while the tensile strength remains invariable compared to the base metal. Longitudinal and transverse stresses are tensile, while the transverse stress is smaller than the longitudinal stress.

关 键 词：电子束焊接 TC11钛合金 组织特征 力学性能 残余应力 

分 类 号：TG456.3[金属学及工艺—焊接]