Effect of equal channel angular pressing on the microstructure and tribocorrosion characteristics of 316L stainless steel. (April 2023)

• Record Type: Journal Article
• Authors: Nagaraj, M.; Ravi Kumar, D.; Suresh, K.S.; Neelakantan, Suresh
• Is Part Of: Vacuum. Volume 210(2023)
• Publication Date: 2023-04
• Subjects: Equal channel angular pressing -- SS316L austenitic stainless steel -- Grain refinement -- Wear resistance -- Tribocorrosion; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2023.111908
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: The tribocorrosion behaviour of equal channel angular pressed (ECAP) 316L austenitic stainless steel was studied. ECAP process had resulted in significant grain reduction from 38 ± 9 μm to 3 ± 1 μm after the 4th pass. Grain refinement had improved hardness up to ∼141% and enhanced the strength by at least ∼64% in the 4th pass sample. The 4th pass sample shows minimum wear volume loss and a low coefficient of friction during the tribocorrosion due to refined grains that show high resistance to plastic deformation. The open circuit potential (OCP) curve of ECAP-processed samples shifts to a more negative potential (∼0.39 V) than the solutionized (∼0.35 V) one. Due to the high wear resistance or less wear depth of ECAP processed samples, a minimal shift was observed. The surface morphology of the wear track confirms that abrasive wear prevails in all the samples. Highlights: Equal channel angular pressing (ECAP) effect on tribocorrosion of SS316L captured. ECAP induced a significant grain refinement from 38 μm to 3 μm in SS316L material. ECAP imposed equivalent strain of 2.67 resulted in maximum wear resistance. Open circuit potential curve reveals not so severe corrosion even with fine grains.