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A Study on Wear Resistance and Surface Hardening of 3%Cr-Mo-V Steel by Two-step Gas Nitriding  

Jung, G.B. (Defense Agency for technology and Quality(DTAQ), Changwon Center, Dept. of Materials Engineering, Changwon National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.22, no.6, 2009 , pp. 361-367 More about this Journal
Abstract
The two-step gas nitriding was adopted to increase the depth of surface hardening in 3%Cr-Mo-V steel. The two-step gas nitriding consisted of Step I; $520^{\circ}C{\times}20\;hrs$ and Step II; $550^{\circ}{\times}70\;hrs$. The layer of two-step gas nitriding showed better uniformity and deeper nitriding layer than one-step gas-nitriding layer. The maximum surface hardness showed the value of 850 Hv. The maximum depth of nitrogen permeation showed $750\;{\mu}m$ (350 Hv). X-ray diffraction analysis showed that compound layer was mainly consisted of CrN and $\varepsilon-Fe_3N$ phases. These phases were presumed contributing to surface hardening and wear resistance. However, the corrosion resistance of gas-nitrided Cr-Mo-V steel were not improved in the solution of 1 N HCl and NaOH. Therefore, it is necessary that the continuous study for improvement of corrosion resistance hereafter.
Keywords
two-step gas nitriding; compound layer; wear resistance; corrosion resistance; CrN; $\varepsilon-Fe_3N$;
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