Active screen plasma surface engineering of austenitic stainless steel for enhanced tribological and corrosion properties

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/671 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/671 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/671 archive 4031 disk0/00/00/02/75 2009-10-07 11:53:10 2019-01-23 09:51:50 2011-07-19 16:15:03 thesis show 0 Corujeira Gallo Santiago Dong Hanshan University of Birmingham Active screen plasma surface engineering of austenitic stainless steel for enhanced tribological and corrosion properties unpub TN 10col_ephy carburising, nitriding, plasma diagnostics, gas discharges Low temperature plasma surface engineering has been a useful method for increasing the hardness and wear resistance of austenitic stainless steel without reducing the corrosion resistance of this alloy. Plasma carburising is of particular interest as it produces thicker hardened layers than plasma nitriding, and an equivalent improvement in the tribological and corrosion performance of the base material. In this project, the active screen (AS) plasma technique was used to carburise austenitic stainless steel AISI 316 and the obtained layer of carbon expanded austenite was compared with the one produced by conventional DC plasma treatments. The hardening and wear resistance produced by AS and DC plasma carburising were equivalent. With regard to corrosion, the AS treated material performed better than its DC counterpart as a consequence of the improved surface quality of the former. The mechanism of AS carburising was comparatively studied with its AS nitriding counterpart. Different experimental arrangements and two plasma diagnostic techniques were used for this purpose: optical emission spectroscopy and electrostatic probes. The evidence shows that AS nitriding relies on the deposition of iron nitrides and the active species in the plasma to produce hardening, whilst AS carburising requires the plasma activation and moderate ion bombardment. 2009-07-16 2009-01 graduation eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. Roberto Rocca Education Program public 289 University of Birmingham School of Metallurgy and Materials d_ph FALSE european_commission other AlBan Programme Scholarship E05M060379AR 2009-07-16 graduation