Please use this identifier to cite or link to this item: https://idr.l1.nitk.ac.in/jspui/handle/123456789/10823
Title: Dependence of Fracture Toughness of Austempered Ductile Iron on Austempering Temperature
Authors: Prasad, Rao, P.
Putatunda, S.K.
Issue Date: 1998
Citation: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 1998, Vol.29, 12, pp.3005-3016
Abstract: Ductile cast iron samples were austenitized at 927 C and subsequently austempered for 30 minutes, 1 hour, and 2 hours at 260 C, 288 C, 316 C, 343 C, 371 C, and 399 C. These were subjected to a plane strain fracture toughness test. Fracture toughness was found to initially increase with austempering temperature, reach a maximum, and then decrease with further rise in temperature. The results of the fracture toughness study and fractographic examination were correlated with microstructural features such as bainite morphology, the volume fraction of retained austenite, and its carbon content. It was found that fracture toughness was maximized when the microstructure consisted of lower bainite with about 30 vol pet retained austenite containing more than 1.8 wt pet carbon. A theoretical model was developed, which could explain the observed variation in fracture toughness with austempering temperature in terms of microstructural features such as the width of the ferrite blades and retained austenite content. A plot of KIC2 against ?? (X?C?)1/2 resulted in a straight line, as predicted by the model.
URI: http://idr.nitk.ac.in/jspui/handle/123456789/10823
Appears in Collections:1. Journal Articles

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