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1	Friction and wear study of lean powder metallurgy steel in a lubricated sliding contact Lejonklo, Caroline January 2019 (has links) 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. 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) Vertical svanning interferometry (VSI) Pin on disc Pin-on-disc Materials Chemistry Materialkemi Inorganic Chemistry Oorganisk kemi Other Chemistry Topics Annan kemi Other Engineering and Technologies Annan teknik Chemical Engineering Kemiteknik Materials Engineering Materialteknik

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Friction and wear study of lean powder metallurgy steel in a lubricated sliding contact