选区激光熔化制备Ni-Cr-B-Si合金粉末的微观组织与性能

doi:10.11896/cldb.18110100

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Abstract Since the mold inserts are prone to failure in service processes, this study proposed a new method for preparing mold inserts. Ni-Cr-B-Si alloy powders specially manufactured were processed by selective laser melting (SLM) with different parameters in this research to obtain metal parts for mould repairing. It has been found that both the surface quality and relative density of the metal parts were improved with the increase of laser energy input. The metal part samples with fine surface roughness (R_a≤3.5 μm) and high relative density (98.6%) were obtained. Rapid melting and solidification in the SLM process resulted in fine gains and microstructures of the metal parts. The main phases of the microstructures included FeNi₃, γ-Ni and Ni₃Si, etc. and the strengthening phases such as M₇C₃, M₂₃C₆ and Cr₂B in the SLM samples. The combination of fine grains with strengthening phases contributes to the excellent mechanical properties of the metal parts. The average microhardness of the SLM prepared metal parts could reach 848.1HV_0.5. Correspondingly, the wear resistance of the metal parts was much better than that of the common hot-work die steel H13 under the same test conditions.

Key words： Ni-Cr-B-Si alloy powders selective laser melting surface morphology microstructures mechanical properties

Published: 03 January 2020

CLC number:

TB36

About author:: Wenquan Wang, a professor and doctoral tutor of the School of Materials Science and Engineering, Jilin University (JLU), has long been engaged in the teaching and research work in the field of materials joining and surface modification. He worked at the postdoctoral workstation of Changchun Railway Vehicle Co., Ltd. from 2010 to 2012, worked as a visiting scholar at the Institute of Surface Engineering of Aachen University in Germany in 2009, worked as a visiting scholar at the Material Connection Laboratory of Busan National University in South Korea in 2007 and conducted a professional project training on “Steel Properties and Applications” in JICA, Japan in 2001. The research results of “ Stainless Steel Car Body Structure Laser Welding Technology Research” and “ Stainless Steel Car Body CMT Welding Technology Research ” have been indust-rialized in Changchun Railway Vehicle Co., Ltd. Also, his project, “ Research on the development and application of new materials for plasma spray welding mold repair ”, has been applied in the Forging Company of FAW Group. He has published more than 20 papers on SCI and EI journals, responsible for completing 17 scientific research projects and authorizing 5 invention patents.

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	WANG Wenquan
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Cite this article:

WANG Wenquan,LI Yaqian,LI Xin, et al. Microstructures and Properties of Ni-Cr-B-Si Alloy Powders Prepared by Selective Laser Melting[J]. Materials Reports, 2020, 34(2): 2077-2082.

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http://www.mater-rep.com/EN/10.11896/cldb.18110100 OR http://www.mater-rep.com/EN/Y2020/V34/I2/2077

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