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Metals 2019, 9(3), 282; https://doi.org/10.3390/met9030282

Mechanical Properties of Tool Steels with High Wear Resistance via Directed Energy Deposition

1
Department of Mechanical Engineering, Chonnam National Univ., 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Korea
2
Smart Manufacturing Process Technology Center, KITECH, Wolchul-dong, Buk-gu, Gwangju 500-460, Korea
3
Division of Mechanical Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-Gu, Busan 49112, Korea
*
Author to whom correspondence should be addressed.
Received: 19 December 2018 / Revised: 14 January 2019 / Accepted: 14 January 2019 / Published: 1 March 2019
(This article belongs to the Special Issue Additive Layer Manufacturing using Metal Deposition)
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Abstract

This study focused on the mechanical and metallurgical characteristics of high-wear-resistance steel (HWS) deposited using directed energy deposition (DED) for metal substrate hardfacing or repairing. As post-deposition heat treatment changes the metallurgical characteristics of deposits, the effect of post-deposition heat treatment on the mechanical properties was investigated via microstructure observation and by conducting hardness, wear, and impact tests. The obtained micro-images showed that the deposited HWS layers exhibit cellular and columnar dendrites, and the microstructure of heat-treated HWS (HT-HWS) transformed its phase during quenching and tempering. The hardness and wear resistance of the HT-HWS deposits were higher than those of the HWS deposited specimen, whereas the latter exhibited a higher fracture toughness. The matrix microstructure and carbide characteristics, which are characterized by the chemical composition of the materials, significantly influenced the mechanical properties. View Full-Text
Keywords: laser deposition; tool steel; hardness; wear; toughness laser deposition; tool steel; hardness; wear; toughness
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Baek, G.Y.; Shin, G.Y.; Lee, K.Y.; Shim, D.S. Mechanical Properties of Tool Steels with High Wear Resistance via Directed Energy Deposition. Metals 2019, 9, 282.

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