Title of article :
Diffusion Layer Growdl Mechaniw.inASPN Method Using an Iron Cage for St52 Steel
Author/Authors :
Kiani Salavat, M Department of Materials and Metallurgical Engineering - Iran University of Science and Technology, Tehran , Soltanieh, M Department of Materials and Metallurgical Engineering - Iran University of Science and Technology, Tehran , Hasheminiasari, M Department of Materials and Metallurgical Engineering - Iran University of Science and Technology, Tehran
Abstract :
The mechanism of diffusion layer growth inplasma nitrided coatings applied on a St52 steel using an active screen is investigated. The nitriding was performed at 450,500 and 550 "C temperature nitriding times of 5, 10 and 15 h, in a gas mixture containing 20 vol. % H2: 80 vol. % N2 and DC-pu/sed plasma nitriding unit.
The swface, cross section and the thickness of diffusion of specimens was studied in terms of optical and scanning electron microscopy. According to the measurements of diffusion layer thickness, values of Q and DO for nitrogen diffusion in substrate were calculated as 50585 OlmoV and 4.1Jx 10-10 (m2/s)respecttve/y. The variations of depth of hardness during nitriding period was determined.
Keywords :
plasma nitriding , AISI St52 tool steel , Diffusion zone , Growth mechanism , microhardness , Active Screen
Journal title :
Astroparticle Physics
