Volume 11, Issue 2 (Journal OF Welding Science and Technology 2025)
JWSTI 2025, 11(2): 13-27 |
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Jafarzadeh A H, Shahriari M S, Ashiri R. Effect of GTAW repair welding and post-weld heat treatment on the microstructure and hardness of IN939 superalloy. JWSTI 2025; 11 (2) :13-27
URL: http://jwsti.iut.ac.ir/article-1-523-en.html
URL: http://jwsti.iut.ac.ir/article-1-523-en.html
1- School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran.
2- Mapna Group Mavadkaran Engineering Company, Iran.
3- School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran. ,ashiri@iust.ac.ir
2- Mapna Group Mavadkaran Engineering Company, Iran.
3- School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran. ,
Abstract: (52 Views)
Repair welding of nickel-based superalloy Inconel 939, which was under working conditions of 100,000 hours, was performed by gas tungsten arc welding using Inconel 617 filler metal. The main objective of this study is to investigate and analyze the challenges during welding such as irregular distribution of primary MC carbides and crack formation in the heat-affected zone, and also to investigate the effect of post-welding heat treatment cycle on the microstructure and hardness of different weld zones. During welding, a crack of 91 micrometers length was observed in the heat affected zone, which due to the presence of a liquation film and accumulation of carbides around the crack, the crack was categorized as a liquation crack. Then, due to post-welding heat treatment, improvement of microstructural characteristics and hardness of the weld zone, partial melted zone, and heat-affected zone was observed, which resulted in homogenization of the hardness profile of the weld. It was observed that post-welding heat treatment caused the crack formed during welding to grow and spread to reach a length of 386 micrometers, which was classified as a strain-aging crack due to its formation and growth during post-welding heat treatment.
Keywords: Inconel 939, repair welding, heat-affected zone, cracking susceptibility, post-weld heat treatment.
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