[논문]Correlation between Microstructure and Tribological Properties of Laser Surface Heat-Treated Stellite Coatings

Park, Chang-Kyoo; Lee, Jung-Hoon; Kang, Nam-Hyun; Chun, Eun-Joon

doi:10.3390/coatings10050433

[해외논문] Correlation between Microstructure and Tribological Properties of Laser Surface Heat-Treated Stellite Coatings 원문보기

Coatings, v.10 no.5, 2020년, pp.433 -

Park, Chang-Kyoo (Laser and Electron Beam Application Department, Korea Institute of Machinery and Materials, Daejeon 34103, Korea) , Lee, Jung-Hoon (Department of Materials Science and Engineering, Pusan National University, Busan 46241, Korea) , Kang, Nam-Hyun (Department of Materials Science and Engineering, Pusan National University, Busan 46241, Korea) , Chun, Eun-Joon (Department of Nano Materials Science and Engineering, Kyungnam University, Changwon 51767, Korea)

Abstract ▼ AI-Helper

To manufacture superior-performance continuous casting mold components, high-velocity oxygen fuel spraying of a Stellite-1 coating was followed by its laser heat treatment at 1373-1473 K using a diode laser. The effects of the laser irradiation conditions on the macro- and microstructural variations along with the hardness and wear resistance within the Stellite-1 coating were evaluated. After the heat treatment, micro-voids within the sprayed coating decreased in number slightly with an increase in the heat treatment temperature. The hardness of the sprayed Stellite-1 coating increased from that of the as-sprayed coating (680 HV) after the laser heat treatment, with a hardness of 860 HV obtained at 1473 K. The cause of the increase in hardness could be the formation of nano-sized W- and Cr-based carbides such as WC, M7C3, and M23C6, as suggested by transmission electron microscopy analysis. The tribological properties of as-sprayed and laser heat-treated samples were investigated by a pin-on-disk tribometer. The laser heat treatment of Stellite-1 coating enhanced wear resistance. This resulted in a lower coefficient of friction and wear rate for the laser heat-treated sample than those for the as-sprayed sample.

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