Optimisation of novel bath for plasma electrolytic nitrocarburising of 316L stainless steel and study of tribological properties of treated steel surfaces
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
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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: PLASMA ELECTROLYSIS; NITROCARBURISING; WEAR RESISTANCE; MICROHARDNESS
Document Type: Research article
DOI: 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
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