Influence of pre- and post-weld heat treats on microstructures of laser welded GTD-111 with IN-718 as filler metal
Author:
Jaruratchataphun Juthamate1, Kiatwisarnkij Napat1, Rojhirunsakool Tanaporn2, Lothongkum Gobboon1, Wangyao Panyawat1
Affiliation:
1. Metallurgical Engineering , Chulalongkorn University Faculty of Engineerin g, Bangkok , Thailand 2. Materials and Production Technology Engineering , King Mongkut’s University of Technology North Bangkok Faculty of Engineering , Bangkok , Thailand
Abstract
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.
Publisher
Walter de Gruyter GmbH
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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