Post-Weld Heat Treatment of Additively Manufactured Inconel 718 Welded to Forged Ni-Based Superalloy AD730 by Linear Friction Welding |
| |
Authors: | Tabaie Seyedmohammad Rézaï-Aria Farhad Flipo Bertrand C.D. Cormier Jonathan Jahazi Mohammad |
| |
Affiliation: | 1.Department of Mechanical Engineering, École de Technologie Supérieure (ÉTS), Montreal, QC, H3C 1K3, Canada ;2.Institut Clément Ader (ICA), Université de Toulouse, CNRS, IMT Mines Albi, INSA, UPS, ISAE, Campus Jarlard, 81013, Albi, France ;3.TWI Ltd, Granta Park, Great Abington, Cambridge, CB21 6AL, United Kingdom ;4.Institut Pprime, UPR CNRS 3346, Département de Physique et Mécanique des Matériaux, ISAE-ENSMA, BP 40109, 86961, Futuroscope-Chasseneuil Cedex, France ; |
| |
Abstract: | A new post-weld heat treatment (PWHT) cycle was designed for novel dissimilar linear friction welding (LFW) of selective laser melted (SLM) Inconel 718 (IN718) to AD730 forged nickel-based superalloy. The microstructure and hardness of the joints after the PWHT are investigated and compared with those of as-linear friction welded samples. The precipitation of γ′ + γ″ is determined as the main mechanism to increase the mechanical properties of SLM IN718 alloy. These particles coarsened during heat treatment at 1253 K and double aging. The results show that the thermomechanical history of linear friction welded joints can affect the microstructure of IN718 alloy such as the morphology of δ phase after solution treatment (ST) from the platelike in the weld zone (WZ) to the needlelike in the base material (BM). It was found that in AD730, nanometric size γ′ particles reprecipitated close to the weld line during rapid cooling after welding. The presence of ultrafine γ′ particles and coarsening of the remaining particles in the microstructure of the alloy, during PWHT, can enhance the strength and hardness. The developed PWHT resulted in uniform hardness across the new dissimilar joint. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|