同一強度水準のADIの疲労信頼性に及ぼす凝固時の冷却速度の影響

概要

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The influence of cooling rate on the fatigue reliability of austempered ductile iron (ADI) was investigated with special attention given to a mesoscopic factor of fracture origin. The main results were as follows. (1) The fatigue strength of ADI could be improved by increasing the cooling rate. (2) Different kinds of casting defects were observed at the origin of fatigue crack in three types of ADI, which were produced through rapid, medium and slow cooling rates (designated as R, M and S materials, respectively). These are larger dross, spheroidal graphite and porosity in R, M and S materials, respectively. (3) The mesoscopic factors of fracture origin, which consisted of casting defects and matrix microstructure, could be quantitatively related to the fatigue life.
社団法人日本機械学会の論文
1996-03-25