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Effect of Weld Geometry on Irradiation-Induced Segregation Resistance of 316L Stainless Steel Weld at 400 °C

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Abstract

To explore the effect of weld geometry on irradiation-induced segregation and irradiation hardening, three different groove types of 316L austenitic stainless steel welds were studied in H+ with 5-MeV to a dose of 6.2 × 1017 ions/cm2 at 400 °C by means of Grazing incident X-ray diffraction, transmission electron microscope, energy-dispersive X-ray spectroscopy and nano-indentation technology. The results show that there was no new phase in three weld geometries after ion irradiation. A smaller heat input made the grain structure of the double U-groove weld smaller, and the surface void size was the smallest after irradiation. The higher grain density and grain boundary density made solute atoms more uniform and less segregated during diffusion, so that the weld had better mechanical properties. It is a feasible idea and method to refine the weld grain by double U-groove welding, so as to improve the irradiation-induced segregation resistance of the weld.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China under Grant Nos. 51875264.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu, China

    Yongfeng Qiao, Yucheng Lei & Zeyu Wang

  2. China General Nuclear Power Group, China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen, 518000, Guangdong, China

    Yiqiang Yao

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  1. Yongfeng Qiao
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  2. Yucheng Lei
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  4. Zeyu Wang
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Correspondence to Yucheng Lei.

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Qiao, Y., Lei, Y., Yao, Y. et al. Effect of Weld Geometry on Irradiation-Induced Segregation Resistance of 316L Stainless Steel Weld at 400 °C. Trans Indian Inst Met 77, 809–819 (2024). https://doi.org/10.1007/s12666-023-03178-8

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