Abstract
An attempt was made to produce microduplex structures for Fe-Cr-Ni alloys with two different volume fractions of γ that is, 28%Cr-9%Ni and 32%Cr-8%Ni steels. The influences of grain size, ageing at 475°C and volume fraction of γ on their tensile properties and fracture were studied.The main results obtained are as follows;(1) A better combination of strength and ductility was obtained for 28%Cr-9%Ni steel (volume fraction of γ; 70%) than that for 32%Cr-8%Ni steel (volume fraction of γ; 30%). This results from the finer microstructures produced by the thermomechanical treatments in the former.(2) The relation between σ0.2 and d-1/2 showed Petch's type equation for the aged specimens with high volume fraction of γ and all unaged specimens. On the other hand, d-1/2 dependence of σ0.2 for the large grained specimens differed from that of the fine ones when the volume fraction of γ was low. This may be caused by the difference in the deformation mode within the α matrix that is, twin or slip deformations.(3) The influence of d on the ductility for the unaged specimens differed from that of the aged ones. The ductility decreased with the decrease in d in the former, whereas it increased in the latter.
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