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The fracture toughness of SA508-III steel was studied in the temperature range from room temperature to 320°C using the J-integral method. The fracture behavior of the steel was also investigated. It was found that the conditional fracture toughness (JQ) of the steel first decreased and then increased with increasing test temperature. The maximum and minimum values of JQ were 517.4 kJ/m2 at 25°C...
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