NDLI: A Facile Nitriding Approach for Improved Impact Wear of Martensitic Cold-Work Steel Using $H_{2}/N_{2}$ Mixture Gas in an AC Pulsed Atmospheric Plasma Jet

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A Facile Nitriding Approach for Improved Impact Wear of Martensitic Cold-Work Steel Using $H_{2}/N_{2}$ Mixture Gas in an AC Pulsed Atmospheric Plasma Jet

Content Provider	MDPI
Author	Guo, Jhao-Yu Kuo, Yu-Lin Wang, Hsien-Po
Copyright Year	2021
Description	In this study, we propose a rapid plasma-assisted nitriding process using $H_{2}/N_{2}$ mixture gas in an atmospheric pressure plasma jet (APPJ) system to treat the surface of SKD11 cold-working steel in order to increase its surface hardness. The generated NH radicals in the plasma region are used to implement an ion-bombardment for nitriding the tempered martensite structure of SKD11 within 18 min to form the functional nitride layer with an increased microhardness around 1095 $HV_{0.3}$. Higher ratios of H/E and $H^{3}/E^{2}$ were obtained for the values of 4.514 × $10^{−2}$ and 2.244 × $10^{−2}$, referring to a higher deformation resistance as compared with the pristine sample. After multi-cycling impact tests, smaller and shallower impact craters with less surface oxidation on plasma-treated SKD11 were distinctly proven to have the higher impact wear resistance. Therefore, the atmospheric pressure plasma nitriding process can enable a rapid thermochemical nitriding process to form a protective layer with unique advantages that increase the deformation-resistance and impact-resistance, improving the lifetime of SKD11 tool steel as die materials.
Starting Page	1119
e-ISSN	20796412
DOI	10.3390/coatings11091119
Journal	Coatings
Issue Number	9
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-09-15
Access Restriction	Open
Subject Keyword	Coatings Manufacturing Engineering Atmospheric Pressure Plasma Jet (appj) Nitriding Functional Nitride Layer Cold-working Steel Surface Hardness Impact Wear
Content Type	Text
Resource Type	Article

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