핵융합로 구조용 저방사화강의 용접부 미세조직 및 기계적 성질

• Published in: 대한용접·접합학회지 Vol. 36; no. 1; pp. 18 - 24
• Main Authors: 문준오(Joonoh Moon), 이진종(Jinjong Lee), 이창훈(Chang-Hoon Lee), 이태호(Tae-Ho Lee), 정승진(Seung-Jin Jung), 정상훈(Sang-Hoon Jeong), 홍현욱(Hyun-Uk Hong)
• Format: Journal Article
• Language: Korean
• Published: 대한용접·접합학회 01.02.2018; 대한용접접합학회
• Subjects: 기계공학; TIG welding; Reduced-Activation Ferritic/Martensitic (RAFM) steel; Heat-Affected Zone (HAZ); Tempered martensite; Post-Weld Heat Treatment (PWHT)
• ISSN: 2466-2232; 2466-2100
• DOI: 10.5781/JWJ.2018.36.1.2

Microstructure evolution and mechanical properties in the welds of reduced-activation ferritic/martensitic steels were investigated. Three Fe-9Cr-1W-Ta-Ti alloys with different Ta and Ti contents were fabricated using a commercial vacuum-induction melting furnace. The welded samples were prepared by tungsten inert gas welding, and then the post-weld heat treatment (PWHT) was carried out. Mechanical properties in the welds before and after PWHT were evaluated by Vickers hardness tests and cross weld tensile tests, and then their results show that heat-affected zone adjacent to the base metal was the weakest region. This is because this region was the most experienced the tempering process repeatedly. In addition, tensile and yield strength decreased with an increase in Ti content and this is because the size of MX carbide increased with an increase in Ti content, resulted in a decrease of precipitation strengthening effect by MX carbide. KCI Citation Count: 2