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Open AccessArticle

Evolution of the Microstructure and Properties of Pre-Boronized Coatings During Pack-Cementation Chromizing

by Jing Zeng 1, Jianjun Hu 1,2,*, Xian Yang 1, Hongbing Xu 2, Hui Li 1 and Ning Guo 3,*
1
College of Material Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
2
Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology, Chongqing 400054, China
3
School of Materials and Energy, Southwest University, Chongqing 400715, China
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(2), 159; https://doi.org/10.3390/coatings10020159
Received: 6 January 2020 / Revised: 29 January 2020 / Accepted: 8 February 2020 / Published: 9 February 2020
(This article belongs to the Section Corrosion, Wear and Erosion)
The effect of chromizing time on the microstructure and properties of B–Cr duplex-alloyed coating prepared by a two-step pack-cementation process was investigated. The phases, microstructure, and element distribution of three coatings obtained were characterized by X-ray diffraction (XRD), secondary electron imaging (SEI), backscattering electron imaging (BSEI), and energy dispersive spectroscopy (EDS), respectively. The results show that as the chromizing time increases, the net-like Fe2B and rod-like CrFeB phases in the coating gradually disappear, and finally completely transform into the block-like Cr2B and CrxCy (Cr7C3 and Cr23C6) phases. The growth kinetics analysis shows that interface reaction dominates the coating growth during the early stage of chromizing, while atomic diffusion gradually controls the coating growth at the later stage. The evolution mechanism of the B-Cr duplex-alloyed coating was also discussed.
Keywords: boronizing; chromizing; microstructure evolution; growth kinetics; wear resistance boronizing; chromizing; microstructure evolution; growth kinetics; wear resistance
MDPI and ACS Style

Zeng, J.; Hu, J.; Yang, X.; Xu, H.; Li, H.; Guo, N. Evolution of the Microstructure and Properties of Pre-Boronized Coatings During Pack-Cementation Chromizing. Coatings 2020, 10, 159.

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