In this study, fracture toughness of cast austenitic stainless steel aged at 300–450°C for up to 15000 h were investigated using fracture toughness test, Charpy impact test and indentation hardness test. Test material was statically casted grade CF-3M stainless steel. As a result of the tests, it was found that the fracture toughness and the Charpy absorbed energy tended to decrease with the increase of aging time. However, the behavior of thermal embrittlement varied at each aging temperature. In particular, the fracture toughness of the specimens aged at 300°C was almost the same as that of the unaged specimens. At elevated temperature, the differences of the fracture toughness between unaged specimens and aged specimens were smaller than that of tested at room temperature.

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