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http://dx.doi.org/10.5695/JKISE.2018.51.4.249

Surface Hardening and Wear Properties of AISI 410 Martensitic Stainless Steel by High & Low Temperature Gaseous Nitriding  

Son, Seok-Won (Heat Treatment R&D Group, Korea Institute of Industrial Technology (KITECH))
Lee, Won-Beom (Heat Treatment R&D Group, Korea Institute of Industrial Technology (KITECH))
Publication Information
Journal of the Korean institute of surface engineering / v.51, no.4, 2018 , pp. 249-255 More about this Journal
Abstract
High temperature and low temperature gaseous nitriding was performed in order to study of the surface hardening and wear properties of the nitrided AISI 410 Martensitic stainless steels. High temperature gaseous nitiridng (HTGN) was carried out using partial pressure $N_2$ gas at $1,100^{\circ}C$ for 10 hour, and Low temperature gaseous nitiridng (LTGN) was conducted in a gas mixture of NH3 and N2 at $470^{\circ}C$ for 10 hour. The nitrided samples were characterized by microhardness measurements, optical microscopy and scanning electron microscopy. The phases were identified by X-ray diffraction and nitrogen concentration was analyzed by GD-OES. The HTGN specimen had a surface hardness of about $700HV_{0.1}$, $350{\mu}m$ of case depth. A ${\sim}50{\mu}m$ thick, $1,250HV_{0.1}$ hard nitrided case formed at the surface of the AISI 410 steel by LTGN, composed nitrogen supersaturated expanded martensite and ${\varepsilon}-Fe_{24}N_{10}$ iron nitrides. Additionally, the results of the wear tests, carried out LTGN specimen was low friction coefficient and high worn mass loss of ball. The increase in wear resistance can be mainly attributed to the increase in hardness and to the lattice distortion caused by higher nitrogen concentration.
Keywords
Gaseous nitridng; Martensitic stainless steels; AISI 410; Surface hardening; Wear properties;
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