Authors: Lei, M. K.; Zhou, Q.; Ou, Y. X.; Song, T. K.; Guo, Y.

Source: Surface Engineering, Volume 26, Number 4, May 2010 , pp. 277-283(7)

Publisher: Maney Publishing

Abstract:

Tribological properties of a single high nitrogen face centred cubic phase ?_N layer formed on the plasma based low energy nitrogen ion implanted AISI 316 austenitic stainless steel were investigated on a ball on disc tribometer against the same stainless steel counterface under a normal load of 2 N with a sliding speed from 0·16 to 0·39 m s^?1. The microhardness of the ?_N phase layer with a thickness of ?13 ?m and a nitrogen peak concentration of ?35 at-% was measured to be ?22 GPa. During the sliding for 1 h, the faint wear tracks of the ?_N phase layer against the same stainless steel ball were observed with all the sliding speeds. The friction coefficient of the ?_N phase layer changed in the range from 0·85 to 0·70 with increasing sliding speed. Formation of the ?_N phase layer on the stainless steel significantly improved the wear resistance of the stainless steel against the same stainless steel. An oxidative wear mechanism of the ?_N phase was found instead of an adhesive wear mechanism of the original stainless steel because the ?_N phase was prone to tribochemical oxidation on the worn surface due to the nitrogen supersaturation in austenite matrix.Tribological properties of a single high nitrogen face centred cubic phase ?_N layer formed on the plasma based low energy nitrogen ion implanted AISI 316 austenitic stainless steel were investigated on a ball on disc tribometer against the same stainless steel counterface under a normal load of 2 N with a sliding speed from 0·16 to 0·39 m s^?1. The microhardness of the ?_N phase layer with a thickness of ?13 ?m and a nitrogen peak concentration of ?35 at-% was measured to be ?22 GPa. During the sliding for 1 h, the faint wear tracks of the ?_N phase layer against the same stainless steel ball were observed with all the sliding speeds. The friction coefficient of the ?_N phase layer changed in the range from 0·85 to 0·70 with increasing sliding speed. Formation of the ?_N phase layer on the stainless steel significantly improved the wear resistance of the stainless steel against the same stainless steel. An oxidative wear mechanism of the ?_N phase was found instead of an adhesive wear mechanism of the original stainless steel because the ?_N phase was prone to tribochemical oxidation on the worn surface due to the nitrogen supersaturation in austenite matrix.

Keywords: WEAR MECHANISM; HIGH NITROGEN FACE CENTRED CUBIC PHASE; PLASMA BASED LOW ENERGY ION IMPLANTATION; AUSTENITIC STAINLESS STEEL; TRIBOLOGICAL PROPERTIES

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708410X12671039164606

Affiliations: Surface Engineering Laboratory, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

Publication date: 2010-05-01

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