Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Evaluation of TIG Welding Characteristics of High Melting Point Ta-Zr Dissimilar Materials

고융점 탄탈륨-지르코늄 소재의 TIG 이종 접합 특성 분석

  • Yong-Jae Lee (Department of Materials Science and Metallurgical Engineering, Sunchon National University) ;
  • Dong-Geun Lee (Department of Materials Science and Metallurgical Engineering, Sunchon National University)
  • 이용재 (국립순천대학교 신소재공학과) ;
  • 이동근 (국립순천대학교 신소재공학과)
  • Received : 2024.10.08
  • Accepted : 2024.11.14
  • Published : 2024.11.30
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Abstract

The aim of the present study is to verify the microstructural and mechanical properties of Ta-Zr dissimilar metals welded using TIG welding. Due to the significant differences in thermo-mechanical properties, microstructures were observed across the weld zone. The HAZ exhibited grain coarsening, while the Zr-side HAZ showed significant Ta diffusion. The fusion zone (FZ) displayed cellular and equiaxed structures. Hardness tests indicated a higher hardness in the FZ due to solid solution strengthening and spinodal decomposition. Tensile tests revealed fracture in the Ta-side HAZ, caused by shrinkage defects and brittle Ta oxides. Fracture surface analysis showed brittle patterns, highlighting the need for defect control in dissimilar Ta-Zr welds.

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Acknowledgement

이 논문은 2024년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 지자체-대학 협력기반 지역혁신 사업(No. 2021RIS-002)과 기초연구사업(No. RS2023-00244296)의 연구지원으로 수행되었으며, 이에 감사드립니다.