New M.E. Thesis Submitted from Prod. Student

ENHANCEMENT OF WEAR RESISTANCE OF CARBON STEEL WITH THE APPLICATION OF THERMAL SPRAY COATINGS By Rakesh Goyal,Production

Abstract
Degradation of material by wear cost a very high loss, whether it is of reputation or economic loss to all the countries. As the wear is a surface phenomenon and occurs mostly at outer surfaces, therefore it is more appropriate and economical to use method of surface modification.
In the present study, detonation gun spray surface modification technique has been used to enhance the wear resistance of two carbon steels namely EN8 and mild steel (MS). After an exhaustive literature survey, alloy powders CrC - 20NiCr32, WC – 10Co -4Cr, Ni-20Cr have been selected to deposit on the substrate steel specimens with the help of detonation gun spray process. Coatings deposited on the substrates were characterized by microstructure analysis. The wear behavior of the coated and uncoated specimens was investigated according to ASTM standard G99-03 on a Pin –On –Disc Wear Test Rig. Cumulative Wear rate and Cumulative wear volume were calculated for the coated, as well as, uncoated specimens for 50N, 60N and 70N normal loads. SEM/EDAX analysis of the worn surfaces was carried out.
The wear performance of WC – 10Co -4Cr was found to be better than the CrC - 20NiCr32, Ni-20Cr coating for both EN8 and MS. It has been concluded that alloy powders CrC - 20NiCr32, WC – 10Co -4Cr and Ni-20Cr deposited with the help of detonation spray process have been found very useful to minimize the wear problem of carbon steels.

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