EFFECT OF SLIDING VELOCITY IN WEAR STUDIES OF PLASMA NITRIDED AISI 316 LN
Keywords:
Sliding wear, Plasma Nitriding, AISI 316 LN, Abrasive wearAbstract
SS 316L (N) is employed in PFBR grid plate sleeves. The suitability study of Chrome nitriding for PFBR grid plate sleeves for subassemblies and tribological testing of SS316L (N) discs were carried out. Discs and pins of SS 316L (N) were subjected to chrome nitriding at 525°C and for 24 hours time duration. The surface modification has resulted in fine surfaces with homogenously hardened structure with a case depth of 50 micron in an average. The micro hardness measurements clearly indicated that the appreciable increase was achieved in hardness. Subsequently friction and wear tests were carried out under high vacuum at PFBR working temperatures. Sliding wear experiments were carried out at various elevated temperatures at constant load (40N) and with sliding speeds of 0.8 and 1.2 m/s using the high vacuum pin-on-disc test rig as per ASTM standard G99-05. SEM analysis of the worn track with respect to sliding velocity revealed that the mode of material loss is more severe in higher sliding velocity. The worn tracks depicted a clear ploughing type of material removal in the SEM analysis, which is a typical feature of an abrasive wear.
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References
Richter E, Gunzel R, Parasacandola S, Telbizova T., Kruse O and Moller W (2000), Nitriding of stainless steel and aluminium alloys by plasma immersion ion implantation, Surface Coatings and Technology, Vol. 128-129, 21-27.
Ensinger W (1996), Plasma immersion ion implantation for metallurgical and semiconductor research and development, Nuclear Instruments and Methods in Physics research B, Vol.120. 270-281.
Arup Dasgupta, Kuppusami P, Vijayalakshmi M, Raghunathan V S (2007), Pulsed plasma nitriding of large components and coupons of chrome plated SS316LN stainless steel, Journal of Material Science, Vol. 42, 8447– 8453.
Fernandes F A P, Heck S C, Pereira R G, Lombardi-Neto A, Totten G E and Casteletti L C (2010), Wear of plasma nitrided and nitrocarburized AISI 316L austenitic stainless steel, Journal of Achievements in Materials and Manufacturing Engineering, Vol. 40, (2), 175-179.
Li Y, Wang L, Xu and Zhang D (2012), Plasma nitriding of AISI 316L austenitic stainless steels at anodic potential, Surface Coatings and Technology Vol 206, 2430–2437.
Devaraju A, Elaya Perumal A, Alphonsa J, Satish V. Kailas and Venugopal S (2012), Sliding wear behavior of plasma nitrided Austenitic Stainless Steel Type AISI 316LN in the temperature range from 25 to 400°C at 10−4 bar, Wear , Vol 288, 17– 26.
Triwiyanto A, Hussain P, Rahman A and Ismail MC (2013), The Influence of Nitriding Time of AISI 316 L Stainless Steel on Microstructure and Tribological Properties, Asian Journal of Scientific Research, Vol 6, 323-330.
