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Open AccessArticle

Effect of Heating Treatment on the Microstructure and Properties of Cr–Mo Duplex-Alloyed Coating Prepared by Double Glow Plasma Surface Alloying

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 Material Science and Energy, Southwest University, Chongqing 400715, China
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(5), 336; https://doi.org/10.3390/coatings9050336
Received: 18 May 2019 / Revised: 23 May 2019 / Accepted: 23 May 2019 / Published: 25 May 2019
In this study, Cr–Mo duplex-alloyed coating was prepared on carbon steel by double glow plasma surface alloying (DGPSA). The effect of annealing and quenching and tempering (Q&T) treatments on the microstructure and performance of the coating was investigated by X-ray diffraction (XRD), energy dispersive spectrometry (EDS), backscattering electron imaging (BSEI) and electron backscattering diffraction (EBSD) techniques. The results show that a gradient structured coating composed of an Fe–Cr–Mo solid solution (Fe–Cr–Mo SS) layer and an alloyed pearlite layer was obtained on the steel surface. The affected layer was adjacent to the coating. After annealing or Q&T, more carbides precipitated in the Fe–Cr–Mo SS layer and alloyed pearlite layer. Most of the C atoms in the subsurface were dragged into the coating to form carbides in the Fe–Cr–Mo SS and alloyed pearlite layers of the coating, transforming the affected layers into a carbon-poor zone. Annealing and Q&T hardly modified the thickness of the coating, but greatly changed the hardness and corrosion resistance of the coating. The Q&T treated samples had higher hardness and better corrosion resistance than the as-DGPSA treated and the annealed samples. View Full-Text
Keywords: Cr–Mo coating; double glow plasma surface alloying; hardness; heat treatment Cr–Mo coating; double glow plasma surface alloying; hardness; heat treatment
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MDPI and ACS Style

Hu, J.; Wang, J.; Jiang, J.; Yang, X.; Xu, H.; Li, H.; Guo, N. Effect of Heating Treatment on the Microstructure and Properties of Cr–Mo Duplex-Alloyed Coating Prepared by Double Glow Plasma Surface Alloying. Coatings 2019, 9, 336.

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