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Study on fracture toughness of 617 Ni-based alloy welded joint under different elevated temperatures

Published online by Cambridge University Press:  24 June 2020

Yuan Gao ,
Chendong Shao ,
Haichao Cui ,
Ninshu Ma  and
Fenggui Lu Open the ORCID record for Fenggui Lu [Opens in a new window]
Yuan Gao
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, PR China
Chendong Shao
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, PR China
Haichao Cui
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, PR China
Ninshu Ma
Affiliation:
Joining & Welding Research Institute, Osaka University, Osaka567-0047, Japan
Fenggui Lu*
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, PR China
*
a)Address all correspondence to this author. e-mail: Lfg119@sjtu.edu.cn
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Abstract

The fracture toughness of 617 Ni-based weld metal (WM) under different elevated temperatures was tested with a novel method and its fracture mechanism was investigated in this paper. It was found that the fracture toughness of WM was lower than that of base metal (BM) at the same temperature, which was mainly due to the coarse columnar structure, differences in misorientation, and precipitated phases. For both BM and WM, the fracture toughness was lower at elevated temperature due to decreased strength. Much more micro-voids caused by Ti(C, N) and M23C6 inside grains of BM could be observed adjacent to the crack path, which accounted for the dramatically decreased fracture toughness of BM at elevated temperature. In comparison, fewer micro-voids could be observed in WM due to the lack of those second particles. As a result, the J0.2 value and propagation path morphology both showed that the WM had more stable microstructure even though possessing lower toughness.

Keywords

elevated temperaturefracture toughnesswelded jointNi-based alloy
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 14 , 28 July 2020 , pp. 1790 - 1802
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Copyright
Copyright © Materials Research Society 2020

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Footnotes

b)

These authors contributed equally to this work.

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