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Open AccessArticle

Comparison of Substrate Preheating on Mechanical and Microstructural Properties of Hybrid Specimens Fabricated by Laser Metal Deposition 316 L with Different Wrought Steel Substrate

by 1,2,3,*, 1,2, 1,2, 1,2 and 4
1
Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
2
Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
Taizhou Xinma Technology Industry Development Co., Ltd., Taizhou 225327, China
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(10), 891; https://doi.org/10.3390/cryst10100891
Received: 28 August 2020 / Revised: 27 September 2020 / Accepted: 28 September 2020 / Published: 1 October 2020
(This article belongs to the Special Issue Microstructural and Mechanical Characterization of Alloys Volume II)
The combination of additive manufacturing and conventional metal forming processes provides the possibility for improvements of forming efficiency and flexibility. Substrate preheating is an implementable technique to improve the interface adhesion properties of the hybrid forming method. The present experiment investigates the adhesion of additive manufactured 316 L steel on P20 and 1045 steel substrates under two substrate temperatures, and the geometrical characterization, interfacial microstructure and mechanical property of the hybrid specimens were compared. As a result, it was found that the ratio of deposition height to the width was reduced and the width was increased under substrate preheating. Tensile results show that the ultimate strength of 1045 and 316 L hybrid specimens was obviously increased, while the properties of hybrid specimens P20 and 316 L were similar, under different substrate temperature conditions. For the hybrid specimens with the metallurgically bonding characteristic, the tensile properties can reach the level of 316 L depositioned specimens fabricated by laser metal deposition (LMD). Furthermore, substrate preheating had little effect on the microstructure of the laser metal deposition zone, and significant influence on the microstructure of the heat affected zone, which was reflected in the difference of the hardness distribution. View Full-Text
Keywords: substrate preheating; hybrid forming; geometrical characteristics; microstructure; tensile properties substrate preheating; hybrid forming; geometrical characteristics; microstructure; tensile properties
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Zhao, Y.; Wang, Z.; Zhao, J.; He, Z.; Zhang, H. Comparison of Substrate Preheating on Mechanical and Microstructural Properties of Hybrid Specimens Fabricated by Laser Metal Deposition 316 L with Different Wrought Steel Substrate. Crystals 2020, 10, 891.

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