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Korean Journal of Metals and Materials > Volume 54(8); 2016 > Article
Korean Journal of Metals and Materials 2016;54(8): 585-591. doi: https://doi.org/10.3365/KJMM.2016.54.8.585
저합금강의 인코넬 625 육성용접 후 열처리에 따른 미세조직 및 기계적 특성
김승필1, 장재호1, 김정수1, 김병준1, 손근용2, 남대근1,*
1한국생산기술연구원 동남지역본부
2인제대학교 나노융합공학부, 나노매뉴팩처링연구소
Microstructure and Mechanical Properties of Inconel 625 Alloy on Low Carbon Steel by Heat Treatment after Overlay Welding
Seungpil Kim1, Jaeho Jang1, Jungsoo Kim1, Byung Jun Kim1, Keun Yong Sohn2, Dae-Geun Nam1,*
1Dongnam Regional Division, Korea Institute of Industrial Technology, Busan 46742, Republic of Korea
2Department of Nanoscience and Engineering, Center for Nano Manufacturing Inje University, Gimhae 50834, Republic of Korea
Correspondence  Dae-Geun Nam ,Tel: +82-51-974-9262, Email: dgnam@kitech.re.kr
Received: 23 October 2015;  Accepted: 29 February 2016.  Published online: 5 August 2016.
ABSTRACT
Overlay welding technique is one of methods used to improve metal mechanical properties such as strength, toughness and corrosion resistance. Generally, Inconel 625 alloy is used for overlay welding layer on low carbon steels for economic consideration. However, the method produces some problems in the microstructure of the cast structure and some defects, caused by the elevated temperatures of the overlay welding process. To resolve these problems, heat treatments are required. In this study, Inconel 625 alloy was welded on a low carbon steel by the overlay welding process to investigate the resulting microstructure and mechanical properties. A double heat treatment was performed to improve the mechanical properties of the welding and substrate layers. It was found that Inconel 625 alloy had an austenite microstructure after the first heat treatment, but the low carbon steel had a ferrite-pearlite microstructure after the second heat treatment. After the double heat treatment, the sample showed the optimum hardness because of grain refinement and homogenization of the microstructure.
Keywords: metals, welding, microstructure, hardness test, double heat treatment
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