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Coatings 2016, 6(4), 63; doi:10.3390/coatings6040063

Fabrication of Microalloy Nitrided Layer on Low Carbon Steel by Nitriding Combined with Surface Nano-Alloying Pretreatment

1
Department of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
2
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yilei Zhang
Received: 14 October 2016 / Revised: 4 November 2016 / Accepted: 8 November 2016 / Published: 17 November 2016
(This article belongs to the Special Issue Surface Chemical Modification)
View Full-Text   |   Download PDF [2943 KB, uploaded 17 November 2016]   |  

Abstract

Surface mechanical attrition treatment (SMAT) is an effective method to accelerate the nitriding process of metallic materials. In this work, a novel technique named surface nano-alloying (SNA) was developed on the basis of surface mechanical attrition treatment, which was employed as a pretreatment for the nitriding of low carbon steel materials. The microstructure and surface properties of treated samples were investigated by SEM, XRD, TEM and the Vickers hardness test. Experimental results showed that a surface alloying layer (Cr element) of about 10–20 μm in thickness was formed on the low carbon steel sample after the surface nano-alloying treatment. After nitriding for the SNA sample, a complex compound layer composed of Fe2–3N, FeCr and Cr2N phases was fabricated. Moreover, the thickness of this compound layer was about 50 μm. Meanwhile, both the surface hardness and wear resistance of the SNA nitrided sample are better that those of the SMAT nitrided sample. This work offers a new approach for improving the nitriding process of steel materials. View Full-Text
Keywords: surface mechanical attrition treatment; surface nano-alloying; nitriding; diffusion; surface properties surface mechanical attrition treatment; surface nano-alloying; nitriding; diffusion; surface properties
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Sun, J.; Yao, Q. Fabrication of Microalloy Nitrided Layer on Low Carbon Steel by Nitriding Combined with Surface Nano-Alloying Pretreatment. Coatings 2016, 6, 63.

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