Abstract
The aim of this work was to analyze the effect of biodiesel and diesel–biodiesel blends on the sliding wear behavior of AISI 440B martensitic stainless steel. Lubricated tests were performed on AISI 440B martensitic stainless steel samples using Brazilian commercial diesel (containing 7 vol.% biodiesel), pure biodiesel, and diesel–biodiesel blends with biodiesel additions of 20% v/v, 30% v/v, and 50% v/v. Non-lubricated tests were also performed. The stainless steel was analyzed in the as-received condition (annealed) and after heat treatments (quenched and tempered at different temperatures), using a pin-on-disk device with an alumina pin, at a 1.8 m/s sliding speed, 14.7 N load, and 4400 m sliding distance, following the ASTM G99-04 Standard. Wear track widths, wear coefficients, and wear track surfaces were analyzed by optical and scanning electron microscopy. The results showed that AISI 440B presented the worst wear behavior in the dry condition with a microstructure characterized by a ferritic matrix and dispersed carbides (annealed condition). The wear resistance increased with the increase in biodiesel content due to the matrix strengthening by the martensitic transformation (heat-treated condition). When the biodiesel content was superior to 50% v/v, a reverse result was found. The observed wear mechanism was abrasive in all conditions. A − 1.35 power law coefficient characterized the wear coefficient as a function of biodiesel content for the annealed condition and a − 0.95 power law coefficient for the heat-treated conditions.
Published Version
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