ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Review
Mechanism behind Brittle-to-ductile Transition Understood by the Interaction between a Crack and Dislocations
Kenji HigashidaMasaki Tanaka
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2012 Volume 52 Issue 4 Pages 704-709

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Abstract

Fundamental mechanism governing the fracture toughness of materials is reviewed in terms of a concept of the interaction between a crack and dislocations. The mechanism behind brittle-to-ductile transition (BDT) is demonstrated using a simple model based on dislocation dynamics and the theory of crack-tip shielding by dislocations. The effects of dislocation mobility as well as dislocation sources on the BDT behavior are discussed, which enables us to understand the various factors such as grain refinement influencing fracture toughness.

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© 2012 by The Iron and Steel Institute of Japan
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