Abstract
Most widely used high strength sintered steel is the diffusion bonded Fe-4Ni-0.5Mo-1.5Cu alloy (Distaloy®AE). Recently volatility of Ni ingot price and supply issue forced the industry to consider using much leaner alloy. This paper describes the load bearing capacity of surface-rolled sintered metal gears made of a newly developed diffusion bonded Fe-0.5Ni-0.5Mo (Distaloy®AQ). Sintered metal gears were surface-rolled, and then case-carburized. The effects of surface rolling on surface properties were examined by measuring the porosities and hardness near the surfaces of the gears. Bending fatigue tests and running tests for the surface-rolled sintered metal gears were carried out. The effects of the surface-rolling on the load bearing capacity of sintered metal gears were determined, and the results were compared with the results for case-carburized wrought steel gears.
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