Effect of Laser Heat-treatment on WC-CoFe Coated Surface by HVOF

Yunkon Joo; Jaehong Yoon; Jehyun Lee

doi:10.3740/MRSK.2019.29.1.52

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2019 Vol.29, Issue 1 Preview Page Next Page

Effect of Laser Heat-treatment on WC-CoFe Coated Surface by HVOF 초고속화염용사 WC-CoFe 코팅층의 레이저 표면 열처리 효과

January 2019. pp. 52-58

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Abstract

The microstructure, hardness, and wear behaviors of a High Velocity Oxygen Fuel(HVOF) sprayed WC-CoFe coating are comparatively investigated before and after laser heat treatments of the coating surface. During the spraying, the binder metal is melted and a small portion of WC is decomposed to W₂C. A porous coating is formed by evolution of carbon oxide gases formed by the reaction of the free carbon and the sprayed oxygen gas. The laser heat treatment eliminates the porosity and provides a more densified microstructure. After laser heat treatment, the porosity in the coating layer decreases from 1.7% to 1.2 and the coating thickness decreases from 150 μm to 100 μm. The surface hardness increases from 1440 Hv to 1117 Hv. In the wear test, the friction coefficient of coating decreases from 0.45 to 0.32 and the wear resistance is improved by the laser heat treatment. The improvement is likely due to the formation of oxide tribofilms.

Keywords

HVOF

wear

laser heat treatment

hardness

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 29
No :1
Pages :52-58
Received Date : 2018-11-26
Revised Date : 2018-12-13
Accepted Date : 2018-12-13
DOI :https://doi.org/10.3740/MRSK.2019.29.1.52

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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