RETRACTED: Ductile to Brittle Transition Temperature of Functionally Graded Steels

Abstract

In this study, ductile-to-brittle transition temperature of functionally graded steels produced by electroslag remelting in both crack divider and crack arrester configurations has been investigated. In crack divider configuration, the results indicate that the brittle behavior depends on the containing phase where brittleness of a specific phase in a certain temperature plays the main role in the fracture of the specimen. In crack arrester configuration, for the specimens with the notch tip placed at graded ferritic region, the closer the notch tip to the bainite layer, the lower the transition temperature. For the specimens with the notch tip placed at graded austenitic region, no transition temperature was observed. It has been found that by situating a crack at bainiteferrite while it propagates into graded austenitic region, no transition temperature is observed. On the other hand, a crack situated at austenitebainite interface propagating into graded ferritic region experiences tran- sition temperature.