Abstract
In this paper, the tensile strength and impact toughness of the friction welded Super304H joints were studied after aging at 625°C for different time. As the aging time increased, the welding zone, heat affected zone and base metal were still austenite, and the number of precipitates gradually increased. The impact toughness of the joints decreased, the tensile strength of the joints increased firstly, than decreased after aged for 500 h, this is attributed to the aggregation and growth of the Cr23C6 carbides. The rupture mode of tensile strength and impact toughness samples changed from ductile fracture to brittle fracture.
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