High fatigue and wear performance can be obtained for PM steel if high density and optimal hardness are reached. To further increase dynamic performance, surface modification techniques are available and can be expected to provide improvements to PM steels so that it approaches that of wrought steel. This paper first explores fatigue and wear performance of different alloys at various densities and then evaluates improvements obtained after diffusion treatments. The impact of the diffusion treatments on microstructure and its influence on the endurance limit and dry rolling-sliding wear resistance is also analyzed. Failure analysis and residual stress measurements are carried out to understand the impact of the surface treatments on dynamic properties. Finally, the PM components results are then compared to wrought steel usually used in gear applications.
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