Effect of Heat Treatment on Microstructure and Properties of TIG Welded Joints of Powder Metallurgy Inconel 718 Alloy

doi:10.11901/1005.3093.2021.651

Chinese Journal of Materials Research

2023, Vol. 37

Issue (3): 184-192 DOI: 10.11901/1005.3093.2021.651

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Effect of Heat Treatment on Microstructure and Properties of TIG Welded Joints of Powder Metallurgy Inconel 718 Alloy

ZHAO Yunmei¹^,², ZHAO Hongze¹, WU Jie¹, TIAN Xiaosheng¹^,², XU Lei¹(

)

^1.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110116, China

Cite this article:

ZHAO Yunmei, ZHAO Hongze, WU Jie, TIAN Xiaosheng, XU Lei. Effect of Heat Treatment on Microstructure and Properties of TIG Welded Joints of Powder Metallurgy Inconel 718 Alloy. Chinese Journal of Materials Research, 2023, 37(3): 184-192.

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Abstract

Powder metallurgy Inconel 718 alloy plates were prepared through hot isostatic pressing route using pre-alloyed Inconel 718 powder (produced by vacuum induction melting inert gas atomization, VIGA) in this paper, and then tungstun inert gas arc welding (TIG) is completed. Characterization of welded joints were performed using SEM, EBSD methods. Influence of post-welding heat treatment on joint microstructure and mechanical properties are analyzed. The results show that the base metal is fine equiaxed crystal, the grain size is about 28 μm, and the tensile strength is close to the requirement of wrought alloys. Powder metallurgy Inconel 718 alloy shows good weldability, no macroscopic porosities and inclusion defects are observed at the joints, and the joint strength is equivalent to the property of the base metal after heat treatment. After homogenization, the Laves phase is basically dissolved, the structure is uniform, ductility is obviously improved. Micropores and Laves can be eliminated by hot isostatic pressing treatment after welding that make mechanical properties more stable. Micro-porosities are easily formed at the interface between the Laves phase and the matrix, micro-porosities accumulate to form micro-cracks and eventually break.

Key words: metallic materials Inconel 718 alloy powder metallurgy welding heat treatment microstructure mechanical properties

Received: 22 November 2021

ZTFLH:

TG441.8

Fund: CAS Project for Young Scientists in Basic Research(YSBR-025)

Corresponding Authors: XU Lei, Tel: (024)83978843, E-mail: lxu@imr.ac.cn

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	ZHAO Yunmei
	ZHAO Hongze
	WU Jie
	TIAN Xiaosheng
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https://www.cjmr.org/EN/10.11901/1005.3093.2021.651 OR https://www.cjmr.org/EN/Y2023/V37/I3/184

Fig.1 Welding plate size (a) and diagram of tensile specimen (b) (unit: mm)

Table 1 Chemical compositions of Inconel 718 powder (%, mass fraction)

Fig.2 Independent particle size distribution (a) and surface morphology (b) of Inconel 718 pre-alloyed powder

Fig.3 Micro-porosity size and distribution of powder metallurgy alloy

Fig.4 Microstructure of powder metallurgy Inconel 718 alloy in different states (a) hot isostatic pressing (b) 980℃ solution and aging (c) 960℃ solution and aging

Table 2 Tensile properties of Inconel 718 alloy in different states

Fig.5 X-ray inspection results of Inconel 718 welding joints (a) and microstructure of the welding joints (b)

Fig.6 Microstructure of cross sections of welding joints after various heat treatments (a) as welded; (b) solution and aging; (c) homogenization and (d) hot isostatic pressing

Fig.7 EBSD analyse of cross sections of TIG welding joints after different heat treatments (a) base metal; (b) as welded and (c) homogenization

Fig.8 Hardness distribution of Inconel 718 alloy welded joints in different heat treatment conditions Note:WM—Weld metal; HAZ—Heat affected zone; BM—Base metal

Fig.9 Tensile properties of Inconel 718 TIG welding joints at room (a) andelevated temperature 650℃ (b)

Fig.10 Tensile fracture of TIG welding joints after different heat treatment at room temperature (a) as welded; (b) solution and aging; (c) homogenization (d) hot isostatic pressing

Fig.11 Tensile fracture of TIG welding joints after different heat treatment at 650℃ (a) as welded; (b) solution and aging; (c) homogenization (d) hot isostatic pressing

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