The microstructural evolution and wear properties of Ni60/high-aluminum bronze composite coatings with directional struc
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The microstructural evolution and wear properties of Ni60/highaluminum bronze composite coatings with directional structure Xiao-Tian Yang* , Xiu-Qian Li, Qiang-Bin Yang, Jun-Ling Duan, Xiao-Yue Fu, Heng-Li Wei, Wen-Sheng Li
Received: 22 September 2019 / Revised: 2 December 2019 / Accepted: 4 August 2020 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The directional structure of Ni60/high-aluminum bronze composite coating was formed using induction remelting and forced cooling. The microstructural evolution and the characteristics of interface growth were studied. The results showed that the remelted coating formed metallurgical bonding with the substrate. The microstructures changed from plane crystal to dendrite, cellular dendrite, fine cellular dendrite, and then to dendrite again with the increase in the cooling rate. The crystal grew along the heat flow direction and had (111) and (200) preferred orientations when the cooling rate was 1.886 mlmin-1mm-2. The plane crystal, dendrite and cellular dendrite were mainly composed of compounds and solid solutions with Ni, Fe and Cu, and they were surrounded by strengthening phases composed of Cr, C and B.
X.-T. Yang*, X.-Q. Li, J.-L. Duan, X.-Y. Fu, H.-L. Wei, W.-S. Li College of Materials Science and Engineering, State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China e-mail: [email protected] X.-T. Yang Wenzhou Engineering Institute of Pump & Valve, Lanzhou University of Technology, Wenzhou 325105, China Q.-B. Yang Chongqing Key Laboratory of Environmental Materials & Remediation Technologies, College of Chemistry & Environmental Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China X.-Y. Fu Department of Material and Chemical Engineering, College of Technology and Engineering. Lanzhou University of Technology, Lanzhou 730050, China
The grain boundary of directional structure coatings showed the characteristic of regular eutectic growth, but grain boundary of remelted coating presented characteristic of divorced eutectic growth. The wear resistance of directional structure coatings is better than that of remelted coating. Keywords Aluminum bronze composite coating; Induction remelting; Directional structure; Grain boundaries; Preferred orientation
1 Introduction At present, the coatings with high hardness and wear resistance are the research hot spots in the field of surface engineering. Ni60 self-fluxing alloy powder has good processing properties, corrosion resistance, oxidation resistance and excellent wear resistance at both room and high temperatures [1–3]. Hence, it is widely used as the coating materials. However, due to complex specifications of products in industries, the single coating cannot meet the requirements of severe working conditions. To improve the coating anti-wear properties, the researchers have added various reinforcements to the ma
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