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A (ferrite+carbide) microduplex structure formed by dynamic recrystallization of ferrite during warm deformation of martensite was found to exhibit superplastic characteristics. The value of m=0.4 was obtained at 973K and a strain rate of 10 −4 s −1 . Microstructural analysis shows that submicron carbides are located at the ferrite grain boundary, while nanometer ones are dispersed...
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