Ductile cast iron was austenitized at four different temperatures and subsequently austempered at six different temperatures. Plane strain fracture toughness was evaluated under all the heat treatment conditions and correlated with the microstructural features such as the austenite content and the carbon content of the austenite. Fracture mechanism was studied by scanning electron microscopy. It was found that the optimum austempering temperature for maximum fracture toughness decreased with increasing austenitizing temperature. This could be interpreted in terms of the microstructural features. A study of the fracture mechanism revealed that good fracture toughness is unlikely to be obtained when austempering temperature is less than half of the austenitizing temperature on the absolute scale. © 2002 Elsevier Science B.V. All rights reserved.

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dc.contributor.authorPrasad Rao, R.
dc.contributor.authorPutatunda, S.K.
dc.date.accessioned2026-02-05T11:00:22Z
dc.date.issuedInvestigations on the fracture toughness of austempered ductile irons austenitized at different temperatures
dc.description.abstract2003
dc.identifier.citationMaterials Science and Engineering: A, 2003, 349, 46054, pp. 136-149
dc.identifier.issn9215093
dc.identifier.urihttps://doi.org/10.1016/S0921-5093(02)00633-0
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/27975
dc.publisherElsevier BV
dc.subjectCast iron
dc.subjectDuctile fracture
dc.subjectMicrostructure
dc.subjectScanning electron microscopy
dc.subjectStrain measurement
dc.subjectAustempering
dc.subjectAustenite
dc.subjectFracture toughness
dc.titleDuctile cast iron was austenitized at four different temperatures and subsequently austempered at six different temperatures. Plane strain fracture toughness was evaluated under all the heat treatment conditions and correlated with the microstructural features such as the austenite content and the carbon content of the austenite. Fracture mechanism was studied by scanning electron microscopy. It was found that the optimum austempering temperature for maximum fracture toughness decreased with increasing austenitizing temperature. This could be interpreted in terms of the microstructural features. A study of the fracture mechanism revealed that good fracture toughness is unlikely to be obtained when austempering temperature is less than half of the austenitizing temperature on the absolute scale. © 2002 Elsevier Science B.V. All rights reserved.

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