Abstract
Ductile to brittle transition (DBT) behavior in two cast duplex stainless steels was investigated; one prepared from a real large -scaled product and the other from small-sized test sample. DBT temperature was higher in the latter specimen than the former specimen. SEM/EBSD observations of the fracture surface and the cross-sectioned plane reveal that microstructure difference brings different fraction of cleavage fracture of ferrite phase. That is, the small-sized test specimen fractures mostly along ferrite cleavage plane, while the specimen prepared from the real product fractures along both ferrite and austenite grains.
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