DIFFUSION LAYER GROWTH MECHANISM IN ASPN METHOD USING AN IRON CAGE FOR ST52 STEEL

Soltanieh, M.; Kiani, M.; Hasheminiasari, M.

doi:10.22068/ijmse.14.2.24

Volume 14, Issue 2 (June 2017) IJMSE 2017, 14(2): 24-31 | Back to browse issues page

‎ 10.22068/ijmse.14.2.24

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Soltanieh M, Kiani M, Hasheminiasari M. DIFFUSION LAYER GROWTH MECHANISM IN ASPN METHOD USING AN IRON CAGE FOR ST52 STEEL. IJMSE 2017; 14 (2) :24-31
URL: http://ijmse.iust.ac.ir/article-1-870-en.html

DIFFUSION LAYER GROWTH MECHANISM IN ASPN METHOD USING AN IRON CAGE FOR ST52 STEEL

M. Soltanieh

, M. Kiani

, M. Hasheminiasari

Abstract: (20318 Views)

- The mechanism of diffusion layer growth in plasma 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-pulsed plasma nitriding unit.

The surface, 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 D₀ for nitrogen diffusion in substrate were calculated as 50585 (j/mol) and 4.11×10^-10 (m²/s)respectively. The variations of depth of hardness during nitriding period was determined

Keywords: plasma nitriding, A St52 steel, Diffusion zone, Growth mechanism