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The effect of deformation on the sigma phase occurrence in some stainless steels


O U Osuoji

Abstract



The effect of deformation on sigma phase occurrence has been studied in two stainless steels, a duplex stainless steel and a ferritic stainless steel. The samples were deformed by rolling at –700C and –1960C and subsequently annealed at 7000C for up to 48 hours. Results show that the α → γ2 reaction precedes the sluggish sigma (σ) phase occurrence. However γ2 latter becomes enveloped by s and the growth of the former is inhibited. The effect of deformation is increased rate of α → γ2 reaction. This results in more sites for the σ precipitation; σ precipitates at αγ2 and α α boundaries. The effect of deformation therefore is to increase the rate of occurrence of σ.



Journal of the Nigerian Association of Mathematical Physics Vol. 8 2004: pp. 327-330

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eISSN: 1116-4336