Austenitic stainless-steel specimens reinforced with aluminium oxide (Al2O3) nanoparticles added in (0.5, 1.0 and 2.5) w/% concentrations were produced by a conventional casting route. The produced composite specimens were analysed in terms of microstructural properties and wear resistance. The pin-on-disc testing method was used to study the wear behaviour of the composite at room temperature, including steady-state coefficient of friction, the running-in behaviour and wear resistance. A

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... ed stainless-steel ball (X47Cr14) with a diameter of 10 mm and hardness of 490 HV1 was used as a loading counter-body, sliding against an investigated disk specimen. Microstructure observations revealed that the concentration and size of the particles have an impact on the distribution of the reinforcement within the matrix as well as on the wear behaviour. The Al2O3 particles increased the hardness and consequently led to improved tribological properties of the composites. Z metodo konvencionalnega litja je bilo izdelano avstenitno nerjavno jeklo z dodatki nanodelcev aluminijevega oksida (Al2O3), v koncentracijah (0.5, 1.0 in 2.5) w/%. Izdelane kompozitne vzorce smo analizirali z vidika mikrostrukture in odpornosti proti obrabi. Pri sobni temperaturi so bili izvedeni "pin-on-disc" obrabni testi za preu~evanje obna{anja obrabe kompozita in dolo~itve obrabne odpornosti, vklju~no z bele'enjem koeficienta trenja v za~etnem in ustaljenem re'imu. Kot protitelo smo uporabili kaljeno nerjavno jekleno kroglico (X47Cr14) s premerom 10 mm in trdoto 490 HV1, ki je drsela po preiskovanem vzorcu. Opazili smo, da ima koncentracija in velikost delcev vpliv tako na porazdelitev armature v matrici kot tudi na obrabno obna{anje kompozita. Dodani Al2O3 nanodelci so pove~ali trdoto in posledi~no izbolj{ali tribolo{ke lastnosti kompozitov.