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Materials 2018, 11(1), 137; doi:10.3390/ma11010137

Micro-Structures and High-Temperature Friction-Wear Performances of Laser Cladded Cr–Ni Coatings

1
and
1,2,*
1
College of Mechanical Engineering, Changzhou University, Changzhou 213164, China
2
Changzhou High Technology Research Key Laboratory of Mould Advanced Manufacturing, Changzhou University, Changzhou 213164, China
*
Author to whom correspondence should be addressed.
Received: 2 December 2017 / Revised: 11 January 2018 / Accepted: 12 January 2018 / Published: 15 January 2018
(This article belongs to the Section Structure Analysis and Characterization)

Abstract

Cr–Ni coatings with the mass ratios of 17% Cr–83% Ni, 20% Cr–80% Ni and 24% Cr–76% Ni were fabricated on H13 hot work mould steel using a laser cladding (LC). The surface–interface morphologies, chemical elements, surface roughness and phase composition of the obtained Cr–Ni coatings were analysed using a scanning electron microscope (SEM), energy disperse spectroscopy (EDS), atomic force microscope (AFM) and X–ray diffractometer (XRD), respectively. The friction–wear properties and wear rates of Cr–Ni coatings with the different mass ratios of Cr and Ni at 600 °C were investigated, and the worn morphologies and wear mechanism of Cr–Ni coatings were analysed. The results show that the phases of Cr–Ni coatings with mass ratios of 17% Cr–83% Ni, 20% Cr–80% Ni and 24% Cr–76% Ni are composed of Cr + Ni single-phases and their compounds at the different stoichiometry, the porosities on the Cr–Ni coatings increase with the Cr content increasing. The average coefficient of friction (COF) of 17% Cr–83% Ni, 20% Cr–80% Ni and 24% Cr–76% coatings are 1.10, 0.33 and 0.87, respectively, in which the average COF of 20% Cr–80% Ni coating is the lowest, exhibiting the better anti-friction performance. The wear rate of 17% Cr–83% Ni, 20% Cr–80% Ni and 24% Cr–76% Ni coatings is 4.533 × 10−6, 5.433 × 10−6, and 1.761 × 10−6 N−1·s−1, respectively, showing the wear resistance of Cr–Ni coatings at a high temperature increases with the Cr content, in which the wear rate is 24% Cr–76% Ni coating with the better reducing wear. The wear mechanism of 17% Cr–83% Ni and 20% Cr–80% Ni and 24% Cr–76% coatings at 600 °C is primarily adhesive wear, and that of 24% Cr–76% coating is also accompanied by oxidative wear. View Full-Text
Keywords: Cr–Ni coating; laser cladding (LC); coefficient of friction (COF); high temperature wear; wear mechanism Cr–Ni coating; laser cladding (LC); coefficient of friction (COF); high temperature wear; wear mechanism
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jiahong, L.; Dejun, K. Micro-Structures and High-Temperature Friction-Wear Performances of Laser Cladded Cr–Ni Coatings. Materials 2018, 11, 137.

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