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Korean Journal of Metals and Materials > Volume 55(9); 2017 > Article
Korean Journal of Metals and Materials 2017;55(9): 664-670. doi: https://doi.org/10.3365/KJMM.2017.55.9.664
STS304의 후열처리에 따른 용접부 미세조직과 기계적 특성 평가
장대한1, 김광윤1, 김형찬1, 전종배1, 남대근1, 손근용2, 김병준1
1한국생산기술연구원 동남지역본부
2인제대학교 나노융합공학부, 나노매뉴팩처링연구소
Evaluation of Mechanical Property for Welded Austenitic Stainless Steel 304 by Following Post Weld Heat Treatment
Daehan Jang1, Kwangyoon Kim1, Hyoung Chan Kim1, Jong Bae Jeon1, Dae-Geun Nam1, Keun Yong Sohn2, Byung Jun Kim1
1Dongnam Regional Division, Korea Institute of Industrial Technology, Busan 46742, Republic of Korea
2Department of Nanoscience and Engineering, Center for Nanomanufacturing, Inje University, Gimhae 50834, Republic of Korea
Correspondence  Byung Jun Kim ,Tel: +82-51-974-9258, Email: jun7741@kitech.re.kr
Received: 30 March 2017;  Accepted: 31 May 2017.  Published online: 30 August 2017.
ABSTRACT
Austenitic stainless steels have excellent mechanical property and corrosion resistance, and are for these reasons used in demanding applications such as power plant, nuclear reactor and off-shore plant. Especially, austenitic stainless steel 304 (STS304) is mainly used as a pipe material in nuclear power plants. Submerged arc welding (SAW) is a commonly used method of welded steel pipes. This method has some problems of microstructure and mechanical properties such as heterogeneous microstructure, ductility decreases, brittleness of a weld region after SAW process. Especially, delta ferrite and dendrite structure is happened in the weld metal after welding process, which affects the decrease of toughness and ductility. Therefore, it requires the post weld heat treatment (PWHT) in order to solve these problems. In this study, welded STS304 was investigate the microstructure and mechanical properties after SAW process. In order to improve the toughness and ductility of weld region, PWHT was performed by controlling the delta-ferrite and dendrite structure. It was found that the mechanical property of the weld region were increased due to the decrease of the delta- ferrite and the recrystallization of the austenite structure after PWHT.
Keywords: austenitic stainless steel, submerged arc welding, post weld heat treatment, delta-ferrite, recrystallization
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