选区激光熔化成形304L不锈钢氦泡长大与辐照硬化行为

doi:10.11896/cldb.22050298

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Abstract The as-built and solution-annealed selective laser melting 304L stainless steel (SLM 304L SS) were implanted with 350 keV He⁺ at 300 ℃ to fluxes of 5×10¹⁶ ions/cm² and then annealed at 600 ℃ for 1 h. The helium bubble growth and irradiation hardening in SLM 304L SS were investigated by TEM, positron annihilation, and nanoindentation measurements. Compared those between two variants of SLM 304L SS, one in as-built condition and the other solution-annealed, the results indicates that the as-built sample of the SLM 304L SS exhibited the outstanding resistance to helium bubble growth in the post-irradiation annealed at 600 ℃. Because abundant defect sinks, including high dislocation densities and interfaces between nano-inclusions and the matrix, can effectively inhibit the helium bubble coarsening. Additionally, the hardening rate of the as-built sample is 19% whereas that of the solution-annealed sample is 51% after annealing. According to the calculation of Orowan model, the difference of helium bubble coarsening is the main reason for the different hardening rate of SLM 304L stainless steel in two states.

Key words： selective laser melting 304L stainless steel He⁺ irradiation helium bubble growth irradiation hardening

Published: 25 January 2024 Online: 2024-01-26

CLC number:

TL341

Fund:Open Project of State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment (CSO-102-001), General Project of National Natural Science Foundation of China (52073176), and Shenzhen International Cooperative Research Science and Technology Plan Project (GJHZ20200731095203011).

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	Articles by authors
	HOU Juan
	LIU Hui
	CHEN Liang
	MIN Shiling
	JIANG Menglei

Cite this article:

HOU Juan,LIU Hui,CHEN Liang, et al. Study of Helium Bubbles Growth and Hardening of Selective Laser Melting 304L Stainless Steel Under He⁺ Irradiation[J]. Materials Reports, 2024, 38(2): 22050298-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22050298 OR http://www.mater-rep.com/EN/Y2024/V38/I2/22050298

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