奥氏体不锈钢焊接接头辐照偏析和辐照硬化的研究

doi:10.11896/cldb.18100168

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Abstract To investigate the grain boundary segregation and hardening of austenitic stainless steel weld joints after helium ion irradiation, three groups of 316L weld joints under different welding parameters were irradiated by He⁺ at doses of 2×10¹⁷ n/cm² and 100 keV. The hardness, microstructure and grain boundary composition of the welding joints were characterized before and after helium ion irradiation. TEM observation revealed that the characteristic irradiated microstructure of weld joints were dislocation loop, dislocation tangle, dislocation wall, dislocation cell and helium bubble, in the size and density, which were not significantly related to the welding parameters. EDS data of grain boundary indicated that the segregation induced by irradiation showed the appearance of Ni-rich and Cr-poor in the original to Cr-rich and Ni-poor in grain bcoundary of weld joints. The microhardness data before and after helium ion irradiation showed that the increase of hardness decreased with the increment of heat input. Therefore, the grain boundary segregation and microstructure change of the weld joints of austenitic stainless steel after irradiation were similar to that of the base metal. The grain size decreased with the decrement of welding heat input, which improved the dislocation channel density in the grains. As a result, the effect of high density defects produced by irradiation were more obvious on the slip resistance. The irradiation hardening increment decreased with increasing heat input in consequence.

Key words： irradiation segregation irradiation hardening weld joint heat input austenitic stainless steel

Published: 15 January 2020

CLC number:

TL341

About author:: Fugui Lipursued his master's degree in Jiangsu University from September 2016 to June 2019. He is mainly engaged in the research on radiation damage mechanism of welded joints.;Yucheng Lei, born in 1962, Ph.D., professor, and doctoral supervisor, is mainly engaged in the connection technology of advanced materials and the control and simulation of welding process. He has been responsible for a number of Natural Science Foundation of China. He has published more than 100 articles in important journals domestically and abroad.

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	LI Fugui
	LEI Yucheng
	LI Tianqing
	ZHU Qiang
	ZHANG Xuening

Cite this article:

LI Fugui,LEI Yucheng,LI Tianqing, et al. Study on Radiation Segregation and Irradiation Hardening of Austenitic Stainless Steel Weld Joints[J]. Materials Reports, 2020, 34(4): 4098-4102.

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http://www.mater-rep.com/EN/10.11896/cldb.18100168 OR http://www.mater-rep.com/EN/Y2020/V34/I4/4098

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