Abstract
This thesis studied that seven kinds of residual elements(inclusions) had influenced on fracture toughness() obtained by Begley-Logsdon and Rolfe-Novak model equation using tensile an d impact test data of I%CrMoV HP(high pressure) rotor steel. design curve of ASME and fracture surface by SEM were also considered, obtained results are summarized as follows was linearly increased with increase of temperature, effect of the inclusions was significantly over FATT. at lower shelf temperature was quantitatively related to yield strength and was agreed well with Begley's equation. It was difficult to determine because of specimen size and tester capacity at upper shelf temperature, but for this view point Rolfe-Novak's equation was useful. The degree of brittle fracture was dependent on FATT fundamentally, adding S, Sb to matrix decreased impact energy and adding Cu, As increased yield(tensile) strength, and the influence of the others minority inclusion was comparatively insignificant.
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