Abstract
We studied the effect of high temperatures on the crack resistance of a 0.4-mm-thick cold-rolled sheet of the modified steel 09Kh16N15M3B. We carried out axial tension (tensile) tests at 823/sup 0/K using 40-mm-wide flat specimens having a 15-mm-long central through cut. Load was applied perpendicular to the plane of the cut. In order to determine the moment of crack extension (displacement) from the initial cut during the process of specimen loading, we recorded the difference in the electrical potentials. Based on this difference, we calculated the crack length using the calibration curve obtained by modeling the crack growth process on an EGDA electrical integrator. A decrease was found in the fracture toughness of the 09Kh16N15M3B thin sheets used for fuel element jackets at elevated temperatures as compared to the room temperature crack resistance characteristics.
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