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Friction and wear study of lean powder metallurgy steel in a lubricated sliding contact
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A fairly new technology used to produce metallic components is powder metallurgy (PM). Among the advantages with this technique are decreased cost of production for complex-shaped parts, new alloys are made possible, reduced end processing, less material loss, and vibrational damping effects. The downside is the number of pores created which can alter the tribological properties of the material.

The focus of this report is to investigate how lean PM steel behaves under tribological contacts.  Friction and wear will be investigated using a pin-on-disc setup to mimic the sliding part of a gear tooth mesh.

Previous studies show that the amount of wear, and if the wear increases or decreases with increased density is dependent on the degree of porosity and the pore size. This means that the wear might be minimized by optimizing the number of pores in the material and their shape and size.

The result of this study shows that the friction coefficient decreases with increasing density. The wear coefficient show signs of the same correlations but further tests are needed. The main wear comes from adhesive wear, with signs of abrasive wear. The amount of abrasive wear seems to increase with an increase in density, supporting previous studies claiming that pores can trap wear debris and decrease the number of abrasive particles in the contact.

Place, publisher, year, edition, pages
2019. , p. 27
Series
UPTEC K, ISSN 1650-8297 ; 19019
Keywords [en]
Lean steel, Powder metallurgy (PM), Powder metallurgy steel (PM steel), Friction, Wear, Sliding contact, Lubricated, Porosity, Tribology, Adhesive wear, Abrasive wear, Gear, Gear tooth, Particles, Polyalphaolefin 8 (PAO 8), Contact pressure, Density, Light optical microscopy (LOM), Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), Vertical svanning interferometry (VSI), Pin on disc, Pin-on-disc
National Category
Materials Chemistry Inorganic Chemistry Other Chemistry Topics Other Engineering and Technologies Chemical Engineering Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-390557OAI: oai:DiVA.org:uu-390557DiVA, id: diva2:1342011
Educational program
Master Programme in Chemical Engineering
Supervisors
Examiners
Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-08-12Bibliographically approved

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Materials ChemistryInorganic ChemistryOther Chemistry TopicsOther Engineering and TechnologiesChemical EngineeringMaterials Engineering

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