Fracture Toughness of 4130 Quenched and Tempered Steel

[+] Author and Article Information
Phuc Nguyen-Duy, Serge Bayard

Materials Science Directorate, Institut de Recherche d’Hydro-Qúebec (IREQ), Varennes, Quebec, Canada

J. Eng. Mater. Technol 103(1), 55-61 (Jan 01, 1981) (7 pages) doi:10.1115/1.3224972 History: Received June 04, 1980; Online September 15, 2009


The fracture-energy criterion JIc was determined by the single specimen method on quenched and tempered 4130 steel used for tower anchor bars of high voltage transmission lines. A thermodynamic approach was used to rationalize JIc as a stable crack initiation criterion. Slow-bend testing was performed on three-point bend specimens of different dimensions. The effect of microstructure (martensite and bainite + ferrite) on the value of JIc is not significant. Specimen dimensions (1.5 × 3 × 15 cm; 2 × 4 × 20 cm) seem not to affect JIc values. Critical stretch zone width, WSZc , was evaluated on broken specimen halves using scanning electron microscopy. With some assumptions, relationships between WSZc , CTOD and JIc were established. Values of JIc calculated via WSZc compare favorably with JIc determined from a single specimen.

Copyright © 1981 by ASME
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