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Tribological studies on various materials under mixed-boundary lubrication regime
2009 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Specimens of ferritic-pearlitic, fully ferritic and austempered ductile irons, as well as aluminium bronze, quenched and tempered steel and case hardened steel were studied by pin on disc testing under mixed-boundary lubrication conditions. The aim was to determine their tribological behaviour at two different contact pressures. The weight loss of the samples (pins and discs)was determined when possible and the wear coefficient was calculated for all of the tests. In addition, optical microscopy observations of the wear scars were performed and hardness profiles of the pins were taken from underneath the worn surface into the bulk. The study has shown that, at the lower contact pressure of 50 MPa, ADI outperformed all of the other materials in showing the lowest total wear coefficient for all of the tribo-pairs (pin + disc), and also for all individual samples (pin or disc), except for the ferritic-pearlitic ductile iron pin when paired against quenched and tempered steel. At the higher contact pressure of 1 GPa, ADI outperformed bronze when paired against case hardened steel, and showed a valuable increase in wear resistance when paired against itself. At 50 MPa the increased wear resistance of ADI is attributed to a higher initial hardness and slightly larger deformation hardening, while at 1 GPa the better properties are attributed not only to a higher hardness but may also in a small part be due to the deformation induced transformation into martensite.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Wear, Tribology, ADI, austempered ductile iron, pin on disc, lubricated sliding
Keyword [sv]
URN: urn:nbn:se:ltu:diva-49317ISRN: LTU-PB-EX--09/015--SELocal ID: 6ac297e6-55e5-4c1f-8b77-51eab757a8b3OAI: diva2:1022664
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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