Effects of Composite Microstructures on Threshold of Fatigue Crack Propagation, ΔK_<th> in Toughened Austempered Ductile Cast Iron

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  • 強靭化ADIの疲労き裂進展の下限界値ΔK_<th>に及ぼす複合組織の影響

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The rolls of matrix microstrucure and graphite at fatigue crack tip in retarding the initiation and growth of fatigue crack was examined with the objective of achieving maximum resistance to fatigue in toughened austempered ductile cast iron, ADI. Especially, composite microstructures, ferritebainite structure has been developed as typical examples of toughened ADI by alloying and heat treatment. It is found that the fatigue threshold, ΔK_<th> in toughened ADI with composite microstructures can be increased by 50 % to 15 MPa √<m>. From fractography it could be interpreted that the above increasing in fatigue threshold should be caused by the crack closure induced by zigzag crack path in composite microstructures.

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