Precipitation ofσPhase Using General Diffusion Equation with Comparison to Vitek Diffusion Model in Dissimilar Stainless Steels

[摘要] This study performs a precipitation examination of theσphase using the general diffusion equation with comparison to the Vitek model in dissimilar stainless steels during multipass welding. Experimental results demonstrate that the diffusivities (DCrδ,DNiδ, andDSiδ) of Cr, Ni, and Si are higher inδ-ferrite than (DCrγ,DNiγ, andDSiγ) in theγphase, and that they facilitate the precipitation of theσphase in the third pass fusion zone. The Vitek diffusion equation can be modified as follows:(Diffusivity)General=Modified  Constant×(Diffusivity)Vitek.

[学科分类] 工业化学