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Fatigue properties of Ca-treated and non-Ca-treated AISI 8620 carburising steel casts with different inclusion distributions were investigated by rotating bending fatigue testing with stress ratio R = -1. The applicability of Murakami-Endo model in predicting the fatigue strength and the lower bound of fatigue limit was examined. Extreme value statistics approach was used to predict the maximum inclusion size and a comparison was made with cleanliness level estimations by ENV 10247 standard and Stahl-Eisen Prufplatt method. The results of these cleanliness level estimations were inconsistent with the results of the statistics of extreme method. The sizes of the inclusions, which initiated the fatigue cracks were clearly larger than the maximum inclusion sizes predicted by the statistics of extreme method. The reason for this may be that the inclusion distribution of the casts is not exponential or that the largest inclusions follow a distribution of their own.

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Bibliographic Reference: Oral Report delivered at: Euromat 2000 Conference on Advances in Mechanical Behaviour, Plasticity and Damage, Hosted at: Tours (FR) 7-9 November 2000
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