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Influence of As-sintered material strength on the improvement of fatigue behaviour by surface rolling

: Tengzelius, J.; Schlieper, G.; Sonsino, C.M.

Institute of Metals, London:
P/M into the 1990's. International Powder Metallurgy Conference. Vol.I
London, 1990
pp.497-508 : Abb.,Tab.,Lit.
International Powder Metallurgy Conference <1990, London>
Conference Paper
Fraunhofer LBF ()
constant amplitude loading; fatigue behaviour; fatigue life estimation; fatigue strength; material property; mechanical property; powder metallurgy; sintering; steel; stress concentration; surface treatment; variable amplitude loading

In 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.