Laser welding of molybdenum socket joint for ultra-high-temperature heat pipes based on niobium alloying

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI:10.1016/S1003-6326(24)66696-3

Jia-xuan ZHAO , Hong-da ZHANG , Lin-jie ZHANG , Xiang-dong DING , Yuan-jun SUN , Guang SUN

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Abstract

The influence of Ti and Zr, Nb alloying on the microstructures and performance of laser-welded molybdenum socket joints was investigated. Following Nb alloying, the average microhardness of the fusion zone (FZ) increased from HV 194.7 to HV 283.3. Additionally, Nb can react with O to form dispersed Nb₂O₅ along grain boundaries, impeding grain boundary migration and dislocation movement while reducing the content of volatile Mo oxide along these boundaries. The incorporation of Nb in FZ partially inhibits pore defects and enhances joint load- bearing capacity. In comparison to the laser-welded joints without adding Nb (LW), the tensile strength of the laser- welded joints with Nb alloying (LW-Nb) was significantly improved by approximately 69% from 327.5 to 551.7 MPa. Furthermore, the fracture mechanism of the joints transitioned from intergranular fracture to transgranular fracture.

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.