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한국생산제조학회 학술지 영문 홈페이지
[ Papers ]
Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 31, No. 1, pp.28-36
ISSN: 2508-5107 (Online)
Print publication date 15 Feb 2022
Received 29 Nov 2021 Revised 03 Jan 2022 Accepted 25 Jan 2022
DOI: https://doi.org/10.7735/ksmte.2022.31.1.28

SiC 나노파우더로 레이저 클래딩 된 Ti-6Al-4V 합금의 표면 물성에 대한 환경 가스 및 공정 변수의 영향

최현석a ; 강타오a ; 김홍석b, *
Effect of Environmental Gas and Process Variables on Surface Properties of Laser-clad Ti-6Al-4V Alloy with SiC Nanopowders
Hyunseok Choia ; Tao Jianga ; Hong Seok Kimb, *
aDepartment of Mechanical Engineering, Graduate School of Seoul National University of Science and Technology
bDepartment of Mechanical and Automotive Engineering, Seoul National University of Science and Technology

Correspondence to: *Tel.: +82-2-970-6333 E-mail address: hongseok@seoultech.ac.kr (Hong Seok Kim).

Abstract

The aim of this study was to improve the surface properties of a Ti-6Al-4V alloy using laser cladding with SiC nanopowders. In an argon environment laser cladding, the TiC and Ti5Si3 reinforcement phases were generated, and the hardness of the coating layer was improved up to three times. Increasing the laser scanning speed further improved the hardness as the grain size decreased. However, the friction characteristics did not improve as the reinforcement phases on the surface fell off during sliding contact and caused wear and tear. In an air environment laser cladding, an increase in the hardness due to the reinforcement phases and an improvement of the friction characteristics due to the formation of the oxide phases were observed simultaneously. The coefficient of friction was reduced by up to 91%. In addition, the quantitative correlation between the friction coefficient and the oxygen content change on the coating surface was analyzed.

Keywords:

Laser cladding, Hardness, Wear, Oxide layer, Friction coefficient

Acknowledgments

이 연구는 서울과학기술대학교 교내 학술연구비 지원으로 수행되었습니다.

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Hyunseok Choi

M.S. student in the Department of Mechanical Engineering, Seoul National University of Science and Technology. His research interest includes laser cladding and laser induced synthesis of nanocomposite materials.

E-mail: seoksa@seoultech.ac.kr

Tao Jiang

M.S. graduate in the Department of Mechanical Engineering, Seoul National University of Science and Technology. His research interest includes laser cladding and metal surface modification.

E-mail: 2981514715@qq.com

Hong Seok Kim

Professor in the Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology. His research interest includes laser surface modification, synthesis of nanocomposite materials, and micro/nanoscale manufacturing.

E-mail: hongseok@seoultech.ac.kr