Influence of ball milling process on microstructure and properties of Ni-based coating by laser cladding
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Influence of ball milling process on microstructure and properties of Ni‑based coating by laser cladding Chao Zhou1 · Min Li1 · Jing Chi1 · Shufeng Wang1 · Mingyang Zhang1 · Min Fang1 · Liangshuai Ren1 Received: 2 July 2020 / Accepted: 7 November 2020 / Published online: 26 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Ni50/(Ti, W)C composite coating was produced by laser cladding. The effect of ball milling process on the homogenization of coating microstructure and coating properties was studied. The microstructure, phase composition, microhardness, and wear resistance of the coating were investigated. The formation and growth of in situ synthesized ceramic particles were analyzed. The results showed that the coating presented a dense and homogeneous microstructure with few pores and no cracks. Ceramic particles (Ti, W)C were in situ synthesized in Ni-based coating. The fining of different kinds of powders can also lead to different microstructure of coatings. A large number of fine and irregular (Ti, W) C precipitated from the composite coating by laser cladding with ball milled Ti + W powder. When the composite powders were milled, the coating was not only reinforced phase, but also the matrix phase γ-(Fe, Ni) content increased. After laser cladding, the composite powders which only ball milling Ti + W powders, the microhardness and wear resistance of the composite coating were improved. Keywords Ni-based coating · Laser cladding · Ball milling
1 Introduction In recent years, with the rapid development of automobile manufacturing, aerospace, petrochemical industry and various parts processing and manufacturing industries, steel has become one of the most commonly used functional materials in industrial production. However, the wear resistance of some steels is poor [1, 2], Many steel products such as shafts, bearings, gears, cutters, etc., often fail due to wear on the surface of the workpiece [3, 4]. In metallurgy, transportation, machinery, energy, aviation and other fields, coatings are usually used to protect the surface of metal parts from corrosion and wear [5–7]. Therefore, in many harsh environments, which are easy to damage the surface of metal parts, coating plays an important role in improving the life of metal matrix [8, 9]. Generally, Ni-based coatings have excellent high-temperature oxidation resistance and wear resistance, which can be used continuously above 600 ℃. They are widely used in bearing, * Min Li [email protected] 1
School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
engine, piston cylinder and other fields and in some hightemperature environments [10–13]. Zheng et al. [14] investigated NiCrBSiWFeCoC coatings, which were prepared by high-speed oxygen fuel (HVOF) technology. The wear properties of sprayed composite coatings were studied. The major crystalline phases consisted of γ-Ni solid solution, Cr7C3, Ni3B and WC. The wear velocity of uncoated ones was approximately two time
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