Authors: Mahzoon, F.¹; Bahrololoom, M. E.²; Javadpour, S.²

Source: Surface Engineering, Volume 25, Number 8, November 2009 , pp. 628-633(6)

Publisher: Maney Publishing

Abstract:

A wear resistant nitrocarburised layer was formed on 316L austenitic stainless steel substrate by dc plasma electrolytic nitrocarburising process (PEN/C). A urea based solution was modified such that the temperature of the bath remained around 400°C under the negative bias voltage of 180 V. To get the best tribological properties, the process was performed in three baths containing 5%NH₄Cl and 3, 2 and 1% sodium carbonate. The structural phases, microhardness and wear behaviour of the produced layers were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, a microhardness tester and a wear testing machine. A compound oxide layer, consisting of Fe₂O₃, Fe₃O₄ and Fe(Cr₂O₄)₂, was formed on the surface. The results showed that a sample treated in a bath containing 5%NH₄Cl and 3%Na₂CO₃ exhibited an improvement of tribological behaviour compared to samples which have been PEN/C treated at higher voltages.

Keywords: NITROCARBURISING; PLASMA ELECTROLYSIS; MICROHARDNESS; WEAR RESISTANCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174329409X397778

Affiliations: 1: Department of Materials Science and Engineering, Shiraz University, Shiraz, Iran;, Email: mahzon@shirazu.ac.ir 2: Department of Materials Science and Engineering, Shiraz University, Shiraz, Iran

Publication date: 2009-11-01

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