Abstract
This study examines the wear characteristics of INCO939 specimens spanning temperatures from 24 °C to 600 °C. Hardness measurements revealed higher values for laser powder bed fusion (LPBF) fabricated and heat-treated samples compared to cast ones. Friction tests indicated increasing coefficient of friction (COF) values for cast samples at high temperatures, while LPBF-fabricated and heat-treated samples exhibited gradual decreases. SEM and EDS mapping analyses highlighted oxidation as a protective mechanism against wear at elevated temperatures. Surface roughness worsened with temperature for cast samples but remained superior for LPBF-fabricated ones. Heat-treated specimens showed improved surface roughness at lower temperatures, decreasing from 30 µm at room temperature to smoother surfaces at 500 °C, but increased to 44 µm at 600 °C.
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