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Kamaraj M
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Kamaraj M
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Kamaraj M
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Kamaraj, Muthusamy
Kamaraj, M.
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5 results
Now showing 1 - 5 of 5
- PublicationEffect of aging treatment on microstructure and wear behaviour of a nickel based hardfaced coating(17-03-2011)
;Kesavan, D.The nickel based Colmonoy 5 alloy powder was deposited on 316 L (N) austenitic stainless steel substrate. In order to examine the effects of aging treatment on the wear behavior of a nickel based hardfacing alloy, the as-deposited coating was aged at 580°C for 5000h in ambient atmosphere. Coating microstructures were characterised by scanning and transmission electron microscopy. Sliding tests were conducted under self mated condition at room temperature and 550°C using a pin-on disc type apparatus. The wear loss of the aged coating was found to be higher than that of the as deposited coating. The coarse grained structure with carbide (Cr23C6) precipitation in the aged coating would account for the higher sliding wear loss. However, the aged coating, with reduced hardness exhibits similar wear behavior of as deposited coating during sliding at 550°C. © (2011) Trans Tech Publications. - PublicationStudy on the Aesthetic Behavior of Anodic Oxidation in ADC12 Aluminum Alloy(01-01-2019)
;Shanmugham, S.; ;Seshadri, S. K. ;Balaji, V. P.Karthi, S.Anodizing/Anodic oxidation is the most common surface treatment of aluminum and its alloys for automobile and aerospace applications. Poor aesthetic appearance (scattered patches on the surface) is the common problem in pressure die-cast ADC12 aluminum alloy when it is subjected to anodic oxidation at higher temperature due to surface segregation. Surface segregation is inevitable in this material where it is a commercial aluminum alloy and having a high level of impurity contents. High impurity will ease to form alloy segregation in surface and subsurface during pressure die-casting and reflect poor surface appearance like yellow color patches. This case study deals to solve the poor aesthetic behavior in ADC12 alloy during the anodic oxidation process. Process condition study was done to eliminate this problem. - PublicationLaves phase control in inconel 718 weldments(01-01-2012)
;Manikandan, S. G.K. ;Sivakumar, D.; Rao, K. PrasadThe detrimental laves formation in fusion zone during welding of Inconel 718 is controlled with compound current pulsing technique along with helium shielding gas. Also solid solution filler wire is used to minimize the niobium segregation. Welds were produced in 2mm thick sheets by GTA welding process and subjected to the characterization techniques. The results show, refined fusion zone microstructure, reduced amount of laves phase, minimum niobium segregation and softer fusion zone in the as welded condition. © (2012) Trans Tech Publications. - PublicationEffect of boron carbide addition on wear behaviour of cobalt based hardfacings by plasma transferred arc process(01-01-2010)
;Achar, D. R.G.; Ganesh Bavisetty, Ch S.Cobalt based alloy with the addition of 5 and 10 wt% boron carbide have been deposited by PTA process on stainless substrates effectively. The dry sliding wear performances of the coated alloys have been studied at room as well as at elevated temperatures. Addition of boron carbide to satellite 6 resulted in refinement of grains and formation of complex carbides and borides, which has lead to increase in hardness and wear resistance of the hardfaced layers. Superior wear resistance has been found to be at the composition of Stellite 6 with 5 wt% addition of boron carbide. © (2010) Trans Tech Publications. - PublicationFretting fatigue studies of surface modified biomedical titanium alloys(01-01-2007)
;Vadiraj, AravindFretting fatigue is a form of adhesive wear damage caused due to tangential micro motion ol two contact bodies under normal pressure and cyclic load. Biomedical implants such as hip joints and bone plates undergo fretting fatigue damage leading to premature in-vivo failure and revisior surgeries. Surface modification of implants delays the process of fretting and thereby improves the life of these medical devices. This work involves investigation of fretting fatigue damage of surface treated titanium alloys couple. The surface treatment involves PVD TiN coating, Plasma nitriding, Ion Implantation, Laser nitriding and thermal oxidation. Fretting of all surface treated alloys have shown both adhesive and abrasive mode of contact damage. Friction coefficient of all the surface treated pairs is less compared to uncoated alloys. Plasma nitrided pairs have shown the best performance in terms of fretting fatigue life and friction coefficient compared to all other coatings Ion implanted pairs have shown little improvement in fretting fatigue lives due to shallow modified layer. PVD TiN coated pairs have irregular friction pattern due to abrasive particles at contact Thermal oxidation and Laser nitriding have shown poor fretting fatigue performance due to high case thickness.