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Title: Surface Engineering of Sugar Cane Mill Rollers
Author: Buchanan, Vernon Everett
ISNI:       0000 0001 3507 3494
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2007
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There has been renewed interest in recent years to address the coating of sugarcane mill rollers, due to the advancement in the development of welding electrodes and wires for surfacing and the need to improve the productivity and extraction of 'Ul!!urcane juice. The aim ofthis study is to evaluate and compare the performance of .hlclded metal arc welding (SMAW) overlays with an experimental arc sprayed. ''(luting in order to identify an alternative process that performs equally or better than SMAW in terms of abrasive wear performance under specific environment. The ~,udy focussed on three main areas: solidification and microstructure, abrasive wear, hud corrosion. The SMAW and arc sprayed coatings were deposited using Fe-Cr-C electrodes amt ,m experimental Fe-Cr-B wire, respectively. Friction and abrasive wear tests Wlrt conducted using a modified block-on-ring tester that simulated the wear eoodltlons experienced in a sugarcane mill, while corrosion tests were performed lIltnJ Jmmcrsion and electrochemical methods. Microstructures of the as-deposited coatings were characterised using optical mt''''L'OPY, scanning electron microscopy (SEM), energy dispersive x-ray (EDX) IIld N=ret)' diffraction (XRD). The wear mechanisms were also investigated by lllminln~ the worn surfaces and subsurfaces using SEM. ('tmlpluison of the resulting SMAW coatings revealed that variations in the • .....hhm of the welding electrodes as well as welding procedure produced significant differences in the microstructure in terms of morphology of the carbides, distribution and proportion of the carbide phases, and microhardness. The arc- 'prayed coating exhibited better abrasive wear and corrosion resistance compared to the SMAW coatings. The amount and distribution of free chromium in the specimens were the primary factors that controlled the corrosion behaviour. The dominant wear m~~hnnisms controlling abrasion were found to be microploughing and microcutting In the hypoeutectic coating, and microcracking in the hypereutectic and are sprayed coatings.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available