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Effects of sintering temperature on the microstructural evolution and wear behavior of WCp reinforced Ni-based coatings

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Abstract

This article focuses on the microstructural evolution and wear behavior of 50wt%WC reinforced Ni-based composites prepared onto 304 stainless steel substrates by vacuum sintering at different sintering temperatures. The microstructure and chemical composition of the coatings were investigated by X-ray diffraction (XRD), differential thermal analysis (DTA), scanning and transmission electron microscopy (SEM and TEM) equipped with energy-dispersive X-ray spectroscopy (EDS). The wear resistance of the coatings was tested by thrust washer testing. The mechanisms of the decomposition, dissolution, and precipitation of primary carbides, and their influences on the wear resistance have been discussed. The results indicate that the coating sintered at 1175°C is composed of fine WC particles, coarse M6C (M=Ni, Fe, Co, etc.) carbides, and discrete borides dispersed in solid solution. Upon increasing the sintering temperature to 1225°C, the microstructure reveals few incompletely dissolved WC particles trapped in larger M6C, Cr-rich lamellar M23C6, and M3C2 in the austenite matrix. M23C6 and M3C2 precipitates are formed in both the γ/M6C grain boundary and the matrix. These large-sized and lamellar brittle phases tend to weaken the wear resistance of the composite coatings. The wear behavior is controlled simultaneously by both abrasive wear and adhesive wear. Among them, abrasive wear plays a major role in the wear process of the coating sintered at 1175°C, while the effect of adhesive wear is predominant in the coating sintered at 1225°C.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, 210009, China

    Chuan-hui Chen, Yang Bai & Xu-chu Ye

  2. State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing, 210009, China

    Chuan-hui Chen, Yang Bai & Xu-chu Ye

Authors
  1. Chuan-hui Chen
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  2. Yang Bai
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  3. Xu-chu Ye
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Correspondence to Xu-chu Ye.

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Chen, Ch., Bai, Y. & Ye, Xc. Effects of sintering temperature on the microstructural evolution and wear behavior of WCp reinforced Ni-based coatings. Int J Miner Metall Mater 21, 1254–1262 (2014). https://doi.org/10.1007/s12613-014-1035-1

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  • DOI: https://doi.org/10.1007/s12613-014-1035-1

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