S. karimzadeh - Department of Materials Engineering, Faculty of Mechanical Engineering, University of Tabriz,۵۱۶۶۶- ۱۴۷۶۶, Tabriz, Iran
F. Mahboubi - Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, P.O Box ۱۵۸۷۵-۴۴۱۳, Tehran, Iran
G. Daviran - Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, P.O Box ۱۵۸۷۵-۴۴۱۳, Tehran, Iran

In the present investigation effects of time and temperature on plasma nitriding behavior of DIN ۱.۲۳۴۴ (AISI H۱۳) steel are studied. Pulsed plasma nitriding process with a gas mixture of N۲ = ۲۵% + H۲ = ۷۵% and duty cycle of ۷۰% is applied to cylindrical samples of DIN ۱.۲۳۴۴ hot work tool steel. X-ray diffraction, surface roughness, microhardness and ball on disc wear test are performed and behavior of plasma nitrided samples are compared. Scanning electron microscopy and optical microscopy are used in order to observe the microstructure of samples after nitriding. XRD results showed that the compound layer is dual phase. Hardness near the surface dropped by rising the process temperature and it rose in longer process durations. The comparison of µ results showed frictional properties in longer durations with lower temperatures is approximately the same in higher temperatures with shorter durations.

Plasma nitriding, Friction coefficient, Effects of parameters, DIN ۱.۲۳۴۴ tool steel.