Influence of pre- and post-weld heat treats on microstructures of laser welded GTD-111 with IN-718 as filler metal

Juthamate Jaruratchataphun; Napat Kiatwisarnkij; Tanaporn Rojhirunsakool; Gobboon Lothongkum; Panyawat Wangyao

doi:10.1515/mt-2022-0324

Article

Influence of pre- and post-weld heat treats on microstructures of laser welded GTD-111 with IN-718 as filler metal

Juthamate Jaruratchataphun
Juthamate Jaruratchataphun, born in 1993, was a graduate student in the Department of Metallurgical Engineering, Chulalongkorn University, Bangkok, Thailand. Her research scope is related to the development and characterization of the preweld and postweld heat treatment conditions of precipitation-strengthened nickel-based superalloys. She received her Bachelor’s degree and Master’s degree in Metallurgical Engineering and Materials from Chulalongkorn University, Bangkok, Thailand in 2015 and 2019, respectively.
, Napat Kiatwisarnkij
Napat Kiatwisarnkij, born in 1993, is a Ph.D. student in the Department of Metallurgical Engineering, Chulalongkorn University, Bangkok, Thailand. Her research scope is related to the development and characterization of nickel-base superalloys. She received her Bachelor’s degree in Physics in 2016 and Master’s degree in Metallurgical Engineering and Materials in 2020 from Chulalongkorn University, Bangkok, Thailand.
, Tanaporn Rojhirunsakool
Tanaporn Rojhirunsakool, is a faculty member of the Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok. She received her Ph.D. in Materials Science and Engineering from the University of North Texas, Denton, TX, in 2014. Her research areas of expertise include high temperature materials such as superalloys.
, Gobboon Lothongkum
Gobboon Lothongkum, born in 1960, is a professor and a member of the Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand. He served as the head of the department from 2015 to 2019. He received his Dr.-Ing. degree from the University of the Federal Armed Force in Hamburg, Germany, and the International Welding Engineer Certificate from the International Institute of Welding in 1994 and 2006, respectively. His areas of expertise include corrosion of metals and alloys, welding and metal joining, stainless steels, and high temperature materials.
and Panyawat Wangyao
Panyawat Wangyao, born in 1971, is a member of the Innovative Metals Research Unit and served as the head of the Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand from 2011 to 2015. He received his Ph.D. in Physical Metallurgy from the Technical University of Kosice, Slovakia, in 2002. His research areas of expertise include high temperature materials such as superalloys, super stainless steels as well as powder metallurgy of alloys.

Published/Copyright: November 29, 2022

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From the journal Materials Testing Volume 64 Issue 12

Abstract

The present research work studied and evaluated conditions of pre-weld and post-weld heat treatments for the laser welding process, aiming to avoid weld cracking, which usually occurs after tungsten inert gas and/or laser welding processes in cast nickel-based superalloys with high aluminum and titanium contents. The pre-weld heat treatment conditions used in the experiments were (1) 1473 K for 7.2 ks, (2) 1433 K for 7.2 ks + 1298 K for 56.7 ks, (3) 1413 K for 7.2 ks + 1298 K for 56.7 ks, (4) 1393 K for 7.2 ks + 1298 K for 56.7 ks. A laser welding process on cast nickel-based superalloys, grade GTD-111, with metal filler of Inconel 718, a nickel-iron based alloy was conducted. From all obtained results, it was found that the pre-weld heat treatment conditions significantly influence microstructures before laser welding. After laser welding and post-weld heat treatment at a temperature of 1473 K for 7.2 ks followed by precipitation aging at a temperature of 1118 K for 86.4 ks (standard heat treatment), all welded specimens exhibited similar microstructures and hardness values. Furthermore, no weld cracking was observed in all welded specimens.

Keywords: GTD-111; Inconel 718; laser welding; post-weld heat treatment; pre-weld heat treatment

Corresponding author: Panyawat Wangyao, Metallurgical Engineering, Chulalongkorn University Faculty of Engineering, Phraya Thai Rd., Pathumwan, 10330, Bangkok, Thailand, E-mail: Panyawat.W@chula.ac.th

Funding source: Chulalongkorn Academic Advancement into its 2nd Century Project (CUAASC)

About the authors

Juthamate Jaruratchataphun

Juthamate Jaruratchataphun, born in 1993, was a graduate student in the Department of Metallurgical Engineering, Chulalongkorn University, Bangkok, Thailand. Her research scope is related to the development and characterization of the preweld and postweld heat treatment conditions of precipitation-strengthened nickel-based superalloys. She received her Bachelor’s degree and Master’s degree in Metallurgical Engineering and Materials from Chulalongkorn University, Bangkok, Thailand in 2015 and 2019, respectively.

Napat Kiatwisarnkij

Napat Kiatwisarnkij, born in 1993, is a Ph.D. student in the Department of Metallurgical Engineering, Chulalongkorn University, Bangkok, Thailand. Her research scope is related to the development and characterization of nickel-base superalloys. She received her Bachelor’s degree in Physics in 2016 and Master’s degree in Metallurgical Engineering and Materials in 2020 from Chulalongkorn University, Bangkok, Thailand.

Tanaporn Rojhirunsakool

Tanaporn Rojhirunsakool, is a faculty member of the Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok. She received her Ph.D. in Materials Science and Engineering from the University of North Texas, Denton, TX, in 2014. Her research areas of expertise include high temperature materials such as superalloys.

Gobboon Lothongkum

Gobboon Lothongkum, born in 1960, is a professor and a member of the Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand. He served as the head of the department from 2015 to 2019. He received his Dr.-Ing. degree from the University of the Federal Armed Force in Hamburg, Germany, and the International Welding Engineer Certificate from the International Institute of Welding in 1994 and 2006, respectively. His areas of expertise include corrosion of metals and alloys, welding and metal joining, stainless steels, and high temperature materials.

Panyawat Wangyao

Panyawat Wangyao, born in 1971, is a member of the Innovative Metals Research Unit and served as the head of the Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand from 2011 to 2015. He received his Ph.D. in Physical Metallurgy from the Technical University of Kosice, Slovakia, in 2002. His research areas of expertise include high temperature materials such as superalloys, super stainless steels as well as powder metallurgy of alloys.

Acknowledgment

Supporting in laser welding experiments by DSI Laser is also acknowledged.

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The authors would like to gratefully acknowledge the financial support by Chulalongkorn Academic Advancement into its 2nd Century Project (CUAASC). Special thanks are also extended to the Electricity Generating Authority of Thailand (EGAT), Nonthaburi, Thailand for material support and technical help.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Published Online: 2022-11-29

Published in Print: 2022-12-16

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Articles in the same Issue

https://doi.org/10.1515/mt-2022-0324

Keywords for this article

GTD-111; Inconel 718; laser welding; post-weld heat treatment; pre-weld heat treatment