FABRICATION AND CHARACTERIZATION OF PLASMA ELECTROLYTIC BOROCARBURIZED LAYERS ON Q235 LOW-CARBON STEEL AT DIFFERENT DISCHARGE VOLTAGES

Bin Wang (), Jie Wu, Xiaoyue Jin, Xiaoling Wu, Wu Zhenglong () and Wenbin Xue
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Bin Wang: College of Arts and Science, Shanxi Agricultural University, Taigu 030801, Shanxi, P. R. China
Jie Wu: #x2020;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China‡Beijing Radiation Center, Beijing 100875, P. R. China
Xiaoyue Jin: #x2020;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China‡Beijing Radiation Center, Beijing 100875, P. R. China
Xiaoling Wu: #x2020;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China‡Beijing Radiation Center, Beijing 100875, P. R. China
Wu Zhenglong: #xA7;Analytical and Testing Center, Beijing Normal University, Beijing 100875, P. R. China
Wenbin Xue: #x2020;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China‡Beijing Radiation Center, Beijing 100875, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 06, 1-9

Abstract: The influence of applied voltage on the plasma electrolytic borocarburizing (PEB/C) layer of Q235 low-carbon steel in high-concentration borax solution was investigated. XRD and XPS spectra of PEB/C layer confirmed that the modified boride layer mainly consisted of Fe2B phase, and the FeB phase only exists in the loose top layer. The applied voltage on Q235 steel played a key role in determining the properties of hardened layers. The thickness and microhardness of boride layers increased with the increase of the applied voltage, which led to superior corrosion and wear resistances of Q235 low-carbon steel. The diffusion coefficient (D) of boride layer at 280, 300 and 330V increased with borocarburizing temperature and ranged from 0.062×10−12m2/s to 0.462×10−12m2/s. The activation energy (Q) of boride layer growth during PEB/C treatment was only 52.83kJ⋅mol−1, which was much lower than that of the conventional boriding process.

Keywords: Plasma electrolytic borocarburizing; Q235 low-carbon steel; corrosion; wear; kinetics (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500883

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