Abstract
AbstractWelded duplex stainless steel castings are used widely in the pressurised water reactor primary coolant circuit at operational temperatures close to 300°C and design lifetimes of several hundred thousand hours. Under these conditions microstructural changes that affect the tensile and fracture properties are known to occur. Results are presented from aging studies over a range of temperatures from 300 to 425°C for durations up to 10000 h. Hardness, impact fracture, and microstructural data are given for weldmetal, heat affected zone (HAZ),and parent casting microstructures. Particular emphasis is placed on HAZ properties and the determination of the fracture mechanism in aged materials. Comparison is made of the activation energy associated with aging induced changes in hardness and impact fracture properties for parent casting and HAZ microstructures. The weldmetal was found to be highly resistant to the effects of aging, thus preventing any determination of activation energy.MST/1183
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