Abstract
The mechanical fracture toughness and subcritical crack growth properties of a CCrMnNiSi pressure vessel steel were evaluated using a compact specimen and a C-shaped specimen. It was determined that the material characteristics were highly directional. The transverse properties were generally below the longitudinal and differ by a factor of five in the reduction in area and a factor of at least two in fracture toughness. The crack growth characteristics were determined from the power relationship da dn = A(ΔK) n and were found to have different rates in the three directions of the material.
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