选区激光熔化IN718合金固溶过程成分均匀化规律的研究

doi:10.11896/cldb.22040096

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Abstract Selective laser melting technology has the advantages of high forming freedom, high forming precision and high forming efficiency. It has great application potential in manufacturing curved surface structure of superalloy. In this work, IN718 alloy was prepared by selective laser melting technology, and the alloy was subjected to solution heat treatment under different conditions. The composition segregation, the distribution of precipitates, the law of composition homogenization in the process of solution, the functional relationship between the shortest solution time and solution temperature, and the formation process of precipitates in the process of solution cooling were studied by means of SEM, TEM and XRD. The results show that the faster solidification rate during the preparation of the alloy makes the composition segregation band of Nb and Ti elements appear at the grain boundary and the boundary of substructure. The thickness of the segregation band is about 50 nm, and Laves phase and MX phase are formed in the composition segregation band. When the temperature is higher than 980 ℃, the component segregation will solute to the matrix. The relationship between the shortest solution time andthe lowest solution temperature is:$t=\frac{1}{3167} \cdot \exp \left(\frac{21597}{T}\right)$. The lower cooling rate will cause the formation of γ″ phase during solution cooling process, which will increase the hardness of the alloy.

Key words： selective laser melting IN718 alloy composition homogenization precipitates

Published: 10 November 2023 Online: 2023-11-10

CLC number:

TG156

Fund:National Natural Science Foundation of China (11672140), the Research Center for Safe Mining and Comprehensive Utilization of Mineral Resources in Inner Mongolia Autonomous Region(2021KZZD04), General Scientific Research Projects of Colleges and Universities in Inner Mongolia Autonomous Region (NJZY23051),and Central Leading Local Science and Technology Development Fund of Inner Mongolia Autonomous Region(2022ZY0183).

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	CAO Yu
	BAI Pucun
	LIU Fei
	HOU Xiaohu

Cite this article:

CAO Yu,BAI Pucun,LIU Fei, et al. Study on Composition Homogenization of IN718 Alloy Fabricated by Selective Laser Melting During Solid Solution Treatment[J]. Materials Reports, 2023, 37(21): 22040096-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22040096 OR http://www.mater-rep.com/EN/Y2023/V37/I21/22040096

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