On the Microstructural Basis of Cleavage Fracture Initiation in Ferritic and Bainitic Steels

[+] Author and Article Information
T. Saario, K. Wallin, K. Törrönen

Technical Research Centre of Finland, SF-02150 Espoo 15, Finland

J. Eng. Mater. Technol 106(2), 173-177 (Apr 01, 1984) (5 pages) doi:10.1115/1.3225695 History: Received May 20, 1983; Online September 15, 2009


The microstructural basis of the critical tensile stress criterion of cleavage fracture is discussed. It is shown that cleavage can be carbide induced in bainitic steels as well as in ferritic steels. The plastic work expended in brittle crack propagation is shown to be somewhat smaller for bainitic steels than for ferritic steels. This is proposed to be caused by the much higher dislocation density of the bainitic microstructure. The statistical nature of the cleavage fracture initiation process is shown to result in a test piece geometry dependent cleavage fracture stress.

Copyright © 1984 by ASME
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