增材制造316L不锈钢组织结构特征与硬化机理

doi:10.11896/cldb.22060103

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Abstract 316L stainless steels with dendritic/cellular structure in various sizes were prepared by different additive manufacturing technologies, that is, wire and arc additive manufacturing (WAAM), directed energy deposition (DED), and laser selective melting (SLM). The formation mec-hanism of dendritic/cellular structure and its influence on the mechanical properties were studied. The results show that the cell/dendrite size progressively decreases in WAAM, DED, and SLM, due to the increase in cooling rates. Meanwhile, bone-like δ ferrites and pronounced enrichment of Cr and Mo are observed in the intercellular/interdendritic regions of the WAAM and DED samples, whereas such phenomena are absent in the SLM sample, because the high cooling rate during SLM significantly suppressed the formation of δ ferrites and element segregation. The microhardness of WAAM, DED, and SLM samples increased progressively, and the hardening mechanism is highly related to the solidification cellular/dendrite size as well as the high density of dislocations induced by the thermal stresses during the additive manufacturing process.

Key words： metal additive manufacturing cellular structure hardening mechanism

Published: 10 February 2024 Online: 2024-02-19

CLC number:

TG142.71

Fund:Key Research and Development Program of Shaanxi Province (2022GY-383),the Fundamental Research Funds for the Central Universities of Chang'an University (300102313205),Fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP202110).

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	Articles by authors
	LIU Yuan
	KOU Haonan
	HE Yiqing
	YOU Ruichang
	ZHANG Xin
	TENG Juheng
	LI Yao
	ZHANG Fengying

Cite this article:

LIU Yuan,KOU Haonan,HE Yiqing, et al. Microstructural Characteristics and Hardening Mechanism of Additively Manufactured 316L Stainless Steels[J]. Materials Reports, 2024, 38(3): 22060103-6.

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https://www.mater-rep.com/EN/10.11896/cldb.22060103 OR https://www.mater-rep.com/EN/Y2024/V38/I3/22060103

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