Ti-6321大厚度钛合金电子束焊接接头组织及性能  

Microstructure and Properties of Electron Beam Welded Joint for Ti-6321 Large Thickness Titanium Alloy

作　　者：高奇[1] 蒋鹏[1] 耿永亮[1] 高福洋[1] 余巍[1] Gao Qi;Jiang Peng;Geng Yongliang;Gao Fuyang;Yu Wei(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《稀有金属材料与工程》2020年第3期990-996,共7页Rare Metal Materials and Engineering

摘　　要：采用真空电子束焊机实现94 mm大厚度Ti-6321(名义成分为Ti-6Al-3Nb-2Zr-1Mo)钛合金全厚度焊接。通过在接头根部填加锁底结构形式获得良好成形的焊缝,接头呈钉形焊缝形貌,深宽比约为16。结果表明:焊缝区为粗大柱状晶,内部排列针状α’马氏体相及编织状片层α相;熔合区是柱状晶与等轴晶联生;单侧热影响区宽约2mm。焊缝区和热影响区的硬度值比母材低,焊接接头抗拉强度与母材相当,拉伸试样均断于焊缝区。焊缝区和热影响区都有较好的冲击韧性,焊接接头厚度方向上力学性能的均匀性较好。Vacuum electron beam welding was used to realize the full thickness welding of Ti-6321(nominal component Ti-6 Al-3 Nb-2 Zr-1 Mo) titanium alloy with 94 mm large thickness. The full thickness of the welded joint can be well formed with the method of bottom locking at the bottom. The welded joint shows approximately parallel weld morphology, and the depth width ratio is about 16. The results show that the weld center is composed of coarse columnar crystal and internally staggered acicular α and α’ phase. The transition is from coarse grain to fine grain near the fusion zone. The width of unilateral heat affected zone is about 2 mm. The microhardness of the weld zone and the heat affected zone are both lower than that of base metal. The tensile strength of welded joint is equivalent to that of the base metal, and the fracture occurs in the weld metal. Both the weld zone and the heat affected zone have better impact toughness. The strength and toughness of the welded joint are excellent. The mechanical properties in the direction of welded joint have good uniformity.

关 键 词：真空电子束焊 Ti-6321钛合金 显微组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]