Influence of chromium and molybdenum content on wear resistance in steel samples fabricated via powder metallurgy
2025
Ibrahim, Kaysse | Matar, Michel | Aly, Hayam
This study examined the impact of different combinations of chromium (5, 10, and 15%) and molybdenum (0.5, 2, 4, and 6%) content on steel samples fabricated using powder metallurgy. The powder amalgamation was compacted using a uniaxial press at a pressure of 686.7 MPa. The samples were sintered in a sealed furnace under argon gas, with a heating rate of 7°C/min, annealing temperature of 500 °C, and sintering temperature of 1150 °C for two hours, followed by cooling at 10 °C/min. The Rockwell surface hardness (HRC) was assessed for the sintered specimens. The dry sand/rubber wheel wear test (ASTM G65) was performed with a normal load of 130 N, a rubber wheel rotational speed of 200 rpm, and 1000 and 6000 revolutions, during which volume loss and wear coefficients were determined. Chromium and molybdenum concentrations directly influence the surface hardness and abrasive wear resistance of samples produced via powder metallurgy. Sintered samples exhibiting surface hardness of up to 80 HRC and exceptional abrasive wear resistance, with wear coefficients not surpassing 2.5×10-14 mm²/N, were produced. The findings indicated an enhancement in hardness and wear resistance with elevated levels of molybdenum and chromium.
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