Abstract
A study has been made on the evaluation of the mechanistic condition for the critical behavior of Quasi-Cleavage (QC) and Intergranular (IG) cracks in the hydrogen charged quenched and tempered ASTM A-490 steel. SEM fractographic examination revealed that the QC facet can be regarded as the critical length of the Griffith Crack independent of the variety of hydrogen charging condition ; i.e., the transitional behaviour of QC to IG can be formulated as the following equation. σ·d0.51max=6.2{σ : stress [MPa], dmax : QC fracture length [m]} Transition of fracture mode from IG crack to MVC could be dependent on the amount of hydrogen. This transitional behaviour of the crack from IG to MVC was also discussed with the measurements of the distance from the surface to the crack front of both QC and IG facets on the fractured surface.
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