Effects of WC Particles on the Wear Resistance Reinforcement Mechanism of Ni25 Coating by Laser Deposition

Wang Tao; Meng Kun; Wang Changhong; Wang Hao; Tang Jie; Zhang Ying

doi:10.15980/j.tzzz.2022.09.001

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Effects of WC Particles on the Wear Resistance Reinforcement Mechanism of Ni25 Coating by Laser Deposition
Vol. 42, Issue 9, Pages: 1057-1060(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.09.001

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Wang Tao, Meng Kun, Wang Changhong, et al. Effects of WC Particles on the Wear Resistance Reinforcement Mechanism of Ni25 Coating by Laser Deposition. [J]. Special Casting & Nonferrous Alloys 42(9):1057-1060(2022)
DOI：

Wang Tao, Meng Kun, Wang Changhong, et al. Effects of WC Particles on the Wear Resistance Reinforcement Mechanism of Ni25 Coating by Laser Deposition. [J]. Special Casting & Nonferrous Alloys 42(9):1057-1060(2022) DOI： 10.15980/j.tzzz.2022.09.001.

摘要

利用激光定向能量沉积在Q235钢表面分别制备了Ni25涂层和Ni25/WC复合涂层，并对两种涂层的微观组织、元素分布、摩擦磨损性能进行了对比分析与研究。结果表明，两种涂层成形良好，无裂纹缺陷；未完全溶解的WC颗粒在Ni25/WC复合涂层中分布较为均匀，部分WC在激光作用下分解。C与涂层中其他元素结合生成多种碳化物，在结晶过程中提供了更多形核点，使得Ni25/WC复合涂层与Ni25涂层相比，晶粒更加细化。部分WC颗粒保持完整形态，WC颗粒改变了涂层的摩擦磨损机理，与Ni25涂层相比，显著提高了涂层的耐磨性能。

Abstract

Ni25 and Ni25/WC coatings were prepared on the surface of Q235 steel by laser directed energy deposition. The element distribution

microstructure and friction-wear properties of the coatings were comparatively analyzed. The results indicate that the coatings are well formed without crack defects. The incompletely dissolved WC reinforcement particles are uniformly distributed in the coating

while a part of that are decomposed under the action of laser

and the C atoms combine with other elements to form a variety of carbides in the coating. During the crystallization process

more nucleation points are provided

making the coating grain more refine compared with Ni25 coating. A part of WC particles remain intact

which change the wear mechanism of the Ni25/WC coating and significantly improve the wear resistance compared with the Ni25 coating.