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Microstructure evolution and nucleation mechanism of Inconel 601H alloy welds by vibration-assisted GTAW

  • Ze-long Wang
  • Zhen-tai ZhengEmail author
  • Li-bing Zhao
  • Yun-feng Lei
  • Kun Yang
Article

Abstract

Nickel-based alloys exhibit excellent high-temperature strength and oxidation resistance; however, because of coarse grains and severe segregation in their welding joints, these alloys exhibit increased susceptibility to hot cracking. In this paper, to improve the hot-cracking resistance and mechanical properties of nickel-based alloy welded joints, sodium thiosulfate was used to simulate crystallization, enabling the nucleation mechanism under mechanical vibration to be investigated. On the basis of the results, the grain refinement mechanism during the gas tungsten arc welding (GTAW) of Inconel 601H alloy under various vibration modes and parameters was investigated. Compared with the GTAW process, the low-frequency mechanical vibration processes resulted in substantial grain refinement effects in the welds; thus, a higher hardness distribution was also achieved under the vibration conditions. In addition, the γ' phase exhibited a dispersed distribution and segregation was improved in the welded joints with vibration assistance. The results demonstrated that the generation of free crystals caused by vibration in the nucleation stage was the main mechanism of grain refinement. Also, fine equiaxed grains and a dispersed γ' phase were found to improve the grain-boundary strength and reduce the segregation, contributing to preventing the initiation of welding hot cracking in nickel-based alloys.

Keywords

mechanical vibration nickel-based alloy grain refinement microstructure hot cracking 

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Notes

Acknowledgements

The authors gratefully acknowledge the financial supported by the Natural Science Foundation of Hebei Province, China (No. E2017202011).

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Ze-long Wang
    • 1
  • Zhen-tai Zheng
    • 1
    Email author
  • Li-bing Zhao
    • 1
  • Yun-feng Lei
    • 1
  • Kun Yang
    • 2
  1. 1.School of Materials Science and EngineeringHebei University of TechnologyTianjinChina
  2. 2.Beiyang Chemical Equipment of Tianjin University Co., Ltd.TianjinChina

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