Surface morphology and mechanical strength of AISI M2 tool steel treated in abnormal glow region of plasma

Naz, M.Y. and Shukrullah, S. and Ghaffar, A. and Shakir, I. and Ullah, S. and Sagir, M. and Pervaiz, M. (2015) Surface morphology and mechanical strength of AISI M2 tool steel treated in abnormal glow region of plasma. Surface Engineering and Applied Electrochemistry, 51 (1). pp. 58-64.

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Abstract

Plasma ion nitriding is a flexible and multi-functional casehardening technique used in the given study for surface modifications of AISI M2 tool steel (0.9 C, 4.2 Cr, 5.0 Mo, 6.0 W, and 2.0 V). By varying the plasma treatment time from 1 to 4 hour and the filling gas pressure from 1 to 4 mbar, the surface nitriding was carried out in the abnormal glow region of a pulsed DC discharge. Pre-plasma treatment heating of the samples was performed by a heating unit; the substrate temperature was raised to 500°C, with the ramping rate of 15°C. The resultant microscopic changes in the surface properties of the plasma treated tool steel were studied with different surface characterization techniques such as X-ray Diffraction, Scanning Electron Microscopy and Vickers�s micro-hardness testing. These investigations confirmed the formation of a compound layer on the plasma exposed surface. It was observed that the layer thickness initially increases and then decreases with nitriding time. Similar results were obtained for increasing filling gas pressure. The X-ray Diffraction results showed a down-shift in the original diffraction peaks, which confirms the nitrogen diffusion into the exposed surface and a compound layer formation. A significant improvement in the surface hardness was also vivid, which might be due to the nitrogen diffusion and the formation of a compound layer on the target surface. © 2015, Allerton Press, Inc.

Item Type: Article
Impact Factor: cited By 0
Uncontrolled Keywords: Electric discharges; Glow discharges; Hardness; Ion implantation; Nitriding; Nitrogen; Plasma applications; Scanning electron microscopy; Steel; Steel testing; Tool steel; Tools; Vickers hardness testing; X ray diffraction, abnormal glow region; DC glow discharge; Plasma ion nitriding; Plasma-exposed surfaces; Pulsed-DC discharge; Substrate temperature; Surface characterization; Surface hardness, Surface discharges
Depositing User: Ms Sharifah Fahimah Saiyed Yeop
Date Deposited: 30 Aug 2021 08:52
Last Modified: 30 Aug 2021 08:52
URI: http://scholars.utp.edu.my/id/eprint/26120

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