Tengzelius, J.J.TengzeliusSchlieper, G.G.SchlieperSonsino, C.M.C.M.Sonsino2022-03-082022-03-081990https://publica.fraunhofer.de/handle/publica/317586In this investigation fatigue-life curves of two low- and high-strength PM-steels Fe-1.5%Cu (Phi = 7.15 g/ccm) and Fe-8.0%Ni-1.0%Mo-0.5%C (Phi = 7.35 g/ccm) are compared for three different notch factors in as-sintered and surface rolled conditions under constant amplitude as well as under variable amplitude loading. The results are interpreted on the basis of microstructural features, microhardness and residual-stress distributions. The paper presents statistically based design data about the improvement of fatigue strength by surface rolling of PM-parts under consideration of stress concentration and loading mode.enconstant amplitude loadingfatigue behaviourfatigue life estimationfatigue strengthmaterial propertymechanical propertypowder metallurgysinteringsteelstress concentrationsurface treatmentvariable amplitude loading620conference paper