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JWJ > Volume 37(4); 2019 > Article
Journal of Welding and Joining 2019 August;37(4) :313-317.
Published online August 30, 2019.
doi:https://doi.org/10.5781/JWJ.2019.37.4.4
Microstructure and Mechanical Properties of Friction-Welded Alloy 718 and SNCRW Stainless Steel After Post-Weld Heat-Treatment
Jeoung Han Kim1  , Nam-Yong Kim2, Yu Sik Kong3, Nho Kwang Park4 
1Department of Materials Science & Engineering, Hanbat National University, Daejeon, 34158, Korea
2Research & Development Center, Taewoong Co., Ltd, Busan, 46740, Korea
3Region Collaboration Center of LINC+, Pukyong National University, Busan, 48547, Korea
4Titanium Department, Korea Institute of Materials Science, Changwon, 51508, Korea
Correspondence: Yu Sik Kong  Email: kongys@pknu.ac.kr
Received July 8, 2019  Revised August 8, 2019  Accepted August 26, 2019  Published online August 30, 2019
ABSTRACT
This study investigated dissimilar friction welding of Alloy 718 to SNCRW stainless steel. After friction welding, the effect of post-weld heat-treatment (PWHT) on the microstructure and mechanical properties was carefully studied. For this purpose, friction welded samples were annealed at 500, 720, and 900 ℃ for 8 hrs, respectively. Heat-treatment at 720 ℃ resulted in highest hardness due to the precipitation of g". On the other hand, relatively low hardness was obtained when PWHT was not performed, or the heat-treatment temperature was not 720 ℃. Residual stress in the welded joints was effectively reduced when heat treatment was performed at temperatures above 720 ℃. Friction welded specimens fractured at the weld joint when no PWHT was performed or when PWHT was performed at 500 or 900 ℃. On the other hand, when PWHT was performed at 720 ℃, tensile failure occurred in the SNCRW base metal.
Keywords: Transient liquid phase bonding | Metailization | Interconnect | Power semiconductor | Intermetallic compounds | Lap-shear test
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