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Metallic Materials Vol. 48 (2010), no. 2, pp. 105 -116

Title: Role of plasma nitriding temperature and time in the corrosion behaviour and microstructure evolution of 15-5 PH stainless steel
Author: BERNARDELLI, E. A., BORGES, P. C., FONTANA, L. C
Abstract: Normal 0 21 false false false SK X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Normálna tabuľka"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Simultaneous plasma nitriding and ageing were performed on 15-5 PH stainless steel, being the treatment time (2, 4 and 6 h) and temperature (390, 440 and 490 °C) the control variables. The highest value for core hardness was obtained at the longest time (6 h) and the lowest temperature (390 °C). A long treatment time (6 h) and high temperature (490 °C) have favoured the surface layer formation. The formation of expanded martensite aN and expanded austenite gN was observed using low nitriding temperature, while raising the temperature favoured the formation of the g’ and CrN phases. When the treatment was carried out at temperatures of 440 and 490 °C, a drop in the corrosion resistance was observed. Treatment at 390 °C led to an improvement in the corrosion potential EI = 0), however, the samples processed at 390 °C  did not show a clear passive region.
Keywords: plasma nitriding, ageing, 15-5 PH stainless steel, phase formation, corrosion
Year: 2010, Volume: 48, Issue: 2 Page From: 105, Page To: 116
doi:10.4149/km_2010_2_105
Price: 6.00 €





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