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10.3390/ma16196510
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Article

Microstructure, Mechanical Properties and Fatigue Crack Growth Behavior of Gas Tungsten Arc Welding Welded Joint of the Hastelloy N Alloy

by
Sai Wang
1,2,
Baoyun Ma
1,2,
Daochen Feng
1,2,
Shuangjian Chen
3,
Yinghe Ma
1,2,4,
Huaxin Li
1,2,4,
Chuanyang Lv
1,2,4,
Wenjian Zheng
1,2,4,* and
Jianguo Yang
1,2,4,*
1
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
2
Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310014, China
3
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
4
Institute of Innovation Research, Shengzhou Zhejiang University of Technology, Shengzhou 312400, China
*
Authors to whom correspondence should be addressed.
Materials 2023, 16(19), 6510; https://doi.org/10.3390/ma16196510
Submission received: 31 August 2023 / Revised: 21 September 2023 / Accepted: 28 September 2023 / Published: 30 September 2023
(This article belongs to the Section Advanced Materials Characterization)
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Abstract

Hastelloy N alloy is an excellent oxidation and corrosion-resistant material, which is selected as the shell material for the main vessel of molten salt reactors (MSRs). In this work, we conducted double-sided gas tungsten arc welding (GTAW) on 4 mm thick Hastelloy N alloy plates to examine the microstructure and mechanical properties of the welded joints. The S−N curve was obtained by fatigue test. The experimental results show that fatigue cracks initiate along the weld toe and propagate inward in a fan-shaped pattern. The hardness is highest in the heat-affected zone (HAZ). The fracture mode observed was trans-granular. The plastic zone in the initial stages of crack propagation remained relatively minimal. However, it gradually expanded during subsequent stages of the process. It is noteworthy that the crack propagation process often involves the development of secondary cracks, accompanied by profound plasticity-induced closure effects. The results of our investigation demonstrate that the welded joint exhibits excellent fatigue performance.
Keywords: Hastelloy N alloy; welding; mechanical property; fatigue performance Hastelloy N alloy; welding; mechanical property; fatigue performance

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MDPI and ACS Style

Wang, S.; Ma, B.; Feng, D.; Chen, S.; Ma, Y.; Li, H.; Lv, C.; Zheng, W.; Yang, J. Microstructure, Mechanical Properties and Fatigue Crack Growth Behavior of Gas Tungsten Arc Welding Welded Joint of the Hastelloy N Alloy. Materials 2023, 16, 6510. https://doi.org/10.3390/ma16196510

AMA Style

Wang S, Ma B, Feng D, Chen S, Ma Y, Li H, Lv C, Zheng W, Yang J. Microstructure, Mechanical Properties and Fatigue Crack Growth Behavior of Gas Tungsten Arc Welding Welded Joint of the Hastelloy N Alloy. Materials. 2023; 16(19):6510. https://doi.org/10.3390/ma16196510

Chicago/Turabian Style

Wang, Sai, Baoyun Ma, Daochen Feng, Shuangjian Chen, Yinghe Ma, Huaxin Li, Chuanyang Lv, Wenjian Zheng, and Jianguo Yang. 2023. "Microstructure, Mechanical Properties and Fatigue Crack Growth Behavior of Gas Tungsten Arc Welding Welded Joint of the Hastelloy N Alloy" Materials 16, no. 19: 6510. https://doi.org/10.3390/ma16196510

APA Style

Wang, S., Ma, B., Feng, D., Chen, S., Ma, Y., Li, H., Lv, C., Zheng, W., & Yang, J. (2023). Microstructure, Mechanical Properties and Fatigue Crack Growth Behavior of Gas Tungsten Arc Welding Welded Joint of the Hastelloy N Alloy. Materials, 16(19), 6510. https://doi.org/10.3390/ma16196510

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