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

被引：0
|
作者：
Zhao Y. [1 ,2 ]
Zhao H. [1 ]
Wu J. [1 ]
Tian X. [1 ,2 ]
Xu L. [1 ]
机构：
[1] Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang
[2] School of Materials Science and Engineering, University of Science and Technology of China, Shenyang
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2023年 / 37卷 / 03期
关键词：
heat treatment; Inconel; 718; alloy; mechanical properties; metallic materials; microstructure; powder metallurgy; welding;
D O I：
10.11901/1005.3093.2021.651
中图分类号：
学科分类号：
摘要：
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. © 2023 Chinese Journal of Materials Research. All rights reserved.
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页码：184 / 192
页数：8
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