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Open AccessArticle

Investigation on the Precipitates of IN718 Alloy Fabricated by Selective Laser Melting

by Yu Cao 1,2,3, Pucun Bai 1,*, Fei Liu 1 and Xiaohu Hou 1
1
College of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2
College of Mechanical and Electric Engineering, Hulunbiur college, Hulunbiur 021000, China
3
Engineering Research Center for the Safe Exploitation and Comprehensive Utilization of Mineral Resources at Universities of Inner Mongolia Autonomous Region, Hulunbiur 021000, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1128; https://doi.org/10.3390/met9101128
Received: 2 September 2019 / Revised: 10 October 2019 / Accepted: 10 October 2019 / Published: 22 October 2019
The microstructure and precipitates of INCONEL 718 alloy (IN718) fabricated by selective laser melting (SLM) are investigated. The matrix is comprised of the elongated γ grains along Z direction, tilting a few degrees. The microstructure mainly consists of a cellular–columnar structure with fine first dendrite arm space of 1–1.5 µm originated from the rapid solidification rate locally. The precipitates of the SLMed IN718 are confirmed to be a significant amount of Laves in the form of irregular bulk distribution, small amount of carbonitride and spherical Al2O3 particles in nanoscale. Some of the carbonitrides grow separately and some of the carbonitrides enwrap the Al2O3 fully or partly, forming the shell structure of the Al2O3–carbonitride. The reheating effect from the following layers to the previous layers have not reached the solid-state transformation temperature of the γ′ and γ″. View Full-Text
Keywords: selective laser melting; IN718; microstructure and precipitation behavior; shell structure selective laser melting; IN718; microstructure and precipitation behavior; shell structure
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MDPI and ACS Style

Cao, Y.; Bai, P.; Liu, F.; Hou, X. Investigation on the Precipitates of IN718 Alloy Fabricated by Selective Laser Melting. Metals 2019, 9, 1128.

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