Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Gigacycle Fatigue Endurance Strength of High Density Mo and Cr-Mo Prealloyed Sintered Steel

  • Xu, Chen (Institute of Chemical Technologies and Analytics, Vienna University of Technology) ;
  • Danninger, Herbert (Institute of Chemical Technologies and Analytics, Vienna University of Technology) ;
  • Khatibi, Golta (Institute of Material Physics, University of Vienna) ;
  • Weiss, Brigitte (Institute of Material Physics, University of Vienna)
  • Published : 2006.09.24
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Abstract

For attaining optimum fatigue resistance of PM steels, high density levels are necessary. In this work, sintered steels Fe-1.5%Mo-0.6%C and Fe-1.5%Cr-0.2%Mo-0.6%C were produced with density levels of 7.1 to $7.6\;g.cm^{-3}$. Ultrasonic fatigue testing with 20 kHz was performed in push-pull mode up to 10E9 cycles. It was shown that the fatigue endurance strength is strongly improved by higher density levels, but also higher sintering temperatures are beneficial. The Cr-Mo steels proved to be superior to the plain Mo alloyed, due to a more favourable as-sintered matrix microstructure.

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