The Influence of Carbon Diffusion on the Character of the γ-α Phase Transformation in Steel

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概要

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• During the austenite-ferrite phase transformation the excess amount of carbon that can not be dissolved in the growing ferrite phase accumulates in the austenite phase ahead of the moving interface. This local carbon enrichment along the interface in the austenite decreases the driving force for transformation. Two processes therefore determine the actual interface velocity: the transformation rate of the iron lattice from fcc to bcc and the diffusion of the carbon along its gradient into the austenite grain. If the diffusion of the carbon is the rate-determining process, the transformation occurs in the diffusion-controlled mode. If the rate of transformation is determined by the lattice transformation, this is called the interface-controlled or mean-field mode. When the transformation rate is not determined by a single process, this is referred to as the mixed mode of transformation.The mixed-mode character can be identified by the carbon concentration in the austenite at the α-γ interface, xCγ, γα. If xCγ, γα is close to the concentration given by the local α-γ equilibrium, the character of the transformation is predominantly diffusion controlled. On the other hand, if diffusion is relatively fast, xCγ, γα is close to the average concentration in the austenite, and the transformation has a interface-controlled character. Due to the build-up of concentration gradients, the transformation character can gradually change during the transformation. In this paper, a two-dimensional study of a mixed-mode transformation is performed for Fe-C alloys of different carbon contents, and the character of the transformation is quantitatively determined.

• 社団法人 日本鉄鋼協会の論文
• 2003-05-15

著者

• SIETSMA Jilt

  Department of Materials Science & Engineering, Delft University of Technology

• Zwaag Sybrand

  Department Of Materials Science & Engineering Delft University Of Technology

• Sietsma Jilt

  Department Of Materials Science & Engineering Delft University Of Technology

• LEEUWEN Yvonne

  Department of Materials Science & Engineering, Delft University of Technology

• Leeuwen Yvonne

  Department Of Materials Science & Engineering Delft University Of Technology

関連論文

• Recovery Processes in the Ferrite Phase in C-Mn Steel
• Mobility Analysis of the Austenite to Ferrite Transformation in Nb Microalloyed Steel by Phase Field Modelling
• The Influence of Carbon Diffusion on the Character of the γ-α Phase Transformation in Steel
• Acoustic Emission as a Probe of the Kinetics of the Martensitic Transformation in a Shape Memory Alloy
• Effect of Inhomogeneous Deformation on the Recrystallization Kinetics of Deformed Metals

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