Abstract
The tensile properties and fracture of the (a+γ) two phase stainless steel with very fine r grains were investigated. Two different microstructures with very fine r grains can be obtained by the thermomechanical treatments ; One has both very fine r and a grains, and the other has very fine r and large a grains. The specimens were prepared in quenched and aged (475° conditions. The results obtained are as follows. The 0.2% proof stress and tensile strength increase with the aging at 475°C for all specimens. The refinement of the γ grains plays an important role for the increase of strength in both quenched and aged conditions, and also for the ductility in the quenched condition. The refinement of α grains, however, contributes to the increase of the ductility in the aged condition. Accordingly, it is found that very good combinations of tensile strength and ductility can be achieved by the aging and the refinement of the γ and α grains (micro duplex structure).
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