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

한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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Gigacycle Fatigue Crack Initiation in Cr-Mo Prealloy 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)
  • 발행 : 2006.09.24
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초록

Crack initiation and short crack propagation was studied on the polished notched surfaces of Cr-Mo prealloy sintered steels with 7.35 $g.cm^{-3}$ sintered density. An ultrasonic resonance test system operating in push-pull mode at 20 kHz and R=-1 was used. It showed that crack initiation took place in several places, small cracks growing oriented to the local pore structure rather than to stress orientation. Their growth rate is markedly higher than the corresponding one of long cracks. Finally, several microcracks join to form a dominant crack.

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