Microstructural characterization and mechanical properties of Ti3Al-Nb/Ni-based superalloy laser-welded joints with different type of V/Cu composite interlayers

材料科学 等轴晶 金属间化合物 高温合金 焊接 复合数 合金 极限抗拉强度 激光束焊接 冶金 微观结构 粒度 复合材料
作者
Xiaolong Cai,Hongmei Li,Libo Wan,Guangbin Xu,Haibo Yu,Daqian Sun,Hongming Nie,Zhaoshuo Deng
出处
期刊:Optics and Laser Technology [Elsevier BV]
卷期号:157: 108736-108736 被引量:12
标识
DOI:10.1016/j.optlastec.2022.108736
摘要

Dissimilar welding of Ti3Al-Nb (Ti-24Al-17Nb) alloy and Ni-based superalloy with different type of V/Cu composite interlayers was performed by laser welding. Detailed microstructural characterization and mechanical properties of the laser-welded joints were investigated. The results indicated that laser welding can be achieved by using the three types of different V/Cu composite interlayers (Type I-0.2 mmV/0.2 mmCu, Type II-0.2 mmV/0.4 mmCu and Type III-0.2 mmV/0.6 mmCu). However, the type of V/Cu composite interlayers has a great influence on the composition distribution, microstructure and mechanical properties of the joints. When Type I was used, the dissimilar weld zone displayed mainly equiaxed and dendrite with fine grain size, and micro-crack was found in the weld. When Type II was used, the weld zone mixed of fine grain region (V-rich phase and Cu-rich phase) and coarse grain region (dendrite V-based solid solution and granular Cu-based solid solution in two-phase separation state). When Type III was used, the weld zone was mainly composed of large Cu solid solution, spherical Ni2V, Ni2V3 and unmelted V layer. The maximum room/high (873 K) temperature tensile strength of the joints was 312 MPa/240 MPa, which was obtained by using Type II. All the joints fractured at the interface on Ti3Al-Nb alloy side, indicating that the interface zone intermetallics were the main factor of affecting the mechanical properties of the joints. Moreover, the interface reaction layer between Ti3Al-Nb and unmetled V layer was also a weak link of Type III joint.
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