Browsing by Author "Kempaiah, U.N."

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Investigations on the effect of ball burnishing parameters on surface hardness and wear resistance of HSLA dual-phase steels
(2008) Rao, D.S.; Hebbar, H.S.; Komaraiah, M.; Kempaiah, U.N.
Surface finish has a vital influence on most functional properties of a component like fatigue life, wear resistance, corrosion resistance, etc. This has given birth to processes such as lapping, honing, burnishing, etc. Burnishing is a fine finishing operation involving the cold working plastic deformation of surface layers to enhance the surface integrity and the functional utility of a component. The present study has been carried out to establish the effect of burnishing parameters viz. feed rate, speed, force, ball diameter and lubricant on surface hardness, and wear resistance of HSLA dual-phase steel specimens. The result indicates that burnishing parameters have significant effect on the surface hardness and wear resistance.
Microstructure and microhardness of copper coated multiwalled carbon nanotube-graphene reinforced aluminium 6061 alloy nanocomposites
(Transstellar Journal Publications and Research Consultancy Private Limited (TJPRC) editor@tjprc.org, 2020) Kumar, V.; Kempaiah, U.N.; Bopanna, B.; Vijay Kumar, V.K.
Multiwalled Carbon Nanotubes (MWCNTs) and graphene reinforced with Aluminium 6061alloy was synthesized by using powder metallurgy route. MWCNTs were copper (Cu) coated by electroless deposition to increase interfacial bonding between matrix and reinforcement. Aluminium 6061alloy (Al6061) powder was reinforced with 2 wt.% of coated and uncoated MWCNTs with varying Graphene of 0.5 wt.%, & 1 wt.%. High energy ball milling was used to mix the powders followed by compaction and sintering. The samples were characterized using FESEM-EDS and X-ray diffraction technique. Microhardness of the nanocomposites samples was determined. It was found that the hybrid nanocomposites showed accentuated properties than the base alloy. © TJPRC Pvt. Ltd.
Studies on the effect of ball burnishing parameters on surface hardness of HSLA dual-phase steels using factorial design
(2008) Rao, D.S.; Hebbar, H.S.; Komaraiah, M.; Kempaiah, U.N.
Burnishing is used increasingly as a finishing operation which gives additional advantages such as increased hardness, fatigue strength and wear resistance. Experimental work based on 34 factorial design was carried out to establish the effects of ball burnishing parameters on the surface hardness of HSLA dualphase steel specimens. Statistical analysis of the results shows that the speed, feed, lubricant and ball diameter have significant effect on surface hardness.
Studies on the effect of ball burnishing parameters on surface hardness of HSLA dual-phase steels using factorial design
(Indian Institute of Metals, 2008) Rao, D.S.; Hebbar, H.S.; Komaraiah, M.; Kempaiah, U.N.
Burnishing is used increasingly as a finishing operation which gives additional advantages such as increased hardness, fatigue strength and wear resistance. Experimental work based on 34 factorial design was carried out to establish the effects of ball burnishing parameters on the surface hardness of HSLA dualphase steel specimens. Statistical analysis of the results shows that the speed, feed, lubricant and ball diameter have significant effect on surface hardness.