Metallurgical Engineering

Metallurgical Engineering

Investigation of strain aging cracking susceptibility in IN738LC superalloy welded by autogenous TIG welding using numerical modeling

Document Type : Research Paper

Authors
Narges Tabrizi 1
Pouria Raissi 1
Ali Mohammad Kolagar 2
Mohammad Cheraghzadeh 3
Eslam Ranjbarnodeh 4
1 Expert of Research and Development Department of Mavad Karan Engineering Company, Mapna Group, Tehran, Iran.
2 Research and development Manager at Mavad Karan Engineering Company, Mapna Group, Tehran, Iran.
3 Deputy Egineering of Mavad Karan Engineering Company, Mapna Group, Tehran, Iran.
4 Assistant Professor, Materials Science & Engineering, Amirkabir University of Technology, Tehran, Iran.
10.22076/me.2023.540857.1333
Abstract
The nickel-based superalloys high sensitivity to various types of cracks during fusion welding and post welding heat treatment, leads to limitations in the repair welding of damaged parts of this material. Strain aging crack is a type of prevalent crack in the IN738LC superalloys that occurs during the post-weld heat treatment, which was investigated in few studies. In this study, using numerical modeling, the susceptibility to strain aging cracking in IN738LC superalloy welded by TIG method without filler metal was investigated. The results of thermal-mechanical modeling as well as experimental evaluation of cross-section of the autogenous welded samples after post-heat treatment showed that the transverse plastic strain of (rather than longitudinal) plastic is a suitable preliminary criterion for evaluating the susceptibility of superalloy to the strain aging cracking and it seems that if the plastic transverse strain is more than 4.6%, the probability of this crack occurring after post weld heat treatment will be very high.
Keywords
Strain aging crack
IN738LC Superalloy
finite element modeling
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  • Receive Date 14 October 2021
  • Revise Date 17 May 2022
  • Accept Date 08 January 2023