(α+γ)2相混合組織をもつFe-Cr-Ni合金の引張性質と破壊

概要

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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℃ 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 σ_<0.2> 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 σ_<0.2> 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.
社団法人日本材料学会の論文
1982-06-15