热处理对选区激光熔化制备17-4PH空蚀性能影响

doi:10.13228/j.boyuan.issn0449-749x.20230190

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Abstract 17-4PH (Precipitation Hardening) stainless steel, as a common material for overflow components such as hydrofoils and turbines, is seriously damaged by cavitation, which causes many safety problems. There are limitations in the traditional process of preparing irregular and complex structural components. In contrast, additive manufacturing technology is a very efficient way of processing such parts. 17-4PH stainless steel was prepared by selective laser melting (SLM). The influence of solution+aging treated (1 040 ℃/1 h+480 ℃/4 h) and ion nitriding on the microstructure and cavitation properties of 17-4PH stainless steel prepared by SLM was studied. The results show that due to the characteristics of rapid cooling and directional solidification of SLM, a large amount of residual austenite is retained in the deposited state, including the columnar crystal and cellular structure in the molten pool along the construction direction. After solution+aging treatment, the original molten pool boundary disappears, the structure is equiaxed crystal, and the strengthening phase precipitates. After ion nitriding treated, a hard layer of nitride of about 20 μm is formed on the surface of the sample. After ion nitriding treatment, the relative content of residual austenite in the sample decreased from 13.1% in the deposited state to 7.5%. In addition, nitrogen infiltration into the matrix material also causes lattice distortion, resulting in a significant shift in the diffraction peak. When cavitation damage occurs, crack initiation and propagation take precedence at the overlap of the melting channel. After solution + aging treated, the cavitation quality is reduced from 7.4 mg as deposit to 5.9 mg after 8 h cavitation damage due to elimination of the melting pool and the boundary of the melting channel and precipitation of the strengthened phase. After nitriding treatment, a hard nitride layer can be formed on the surface of the sample to further improve the cavitation resistance, cavitation damage causes minimal damage to the surface of the sample, resulting in minimal material detachment and a loss of only 5.5 mg of cavitation mass.

Key words： SLM 17-4PH solution and aging ion nitriding cavitation erosion

Received: 17 April 2023

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	Articles by authors
	WANG Yan
	WEI Gang
	WEI Yingkang
	WANG Jianyong
	ZHANG Liangliang
	JIA Wenpeng
	LIU Shifeng

Cite this article:

WANG Yan,WEI Gang,WEI Yingkang等. Effect of heat treatment on cavitation erosion properties of 17-4PH prepared by selective laser melting[J]. Iron and Steel, 2023, 58(10): 140-150.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230190 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I10/140

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