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Abstract The sensitization process of austenitic stainless steel in, indeed, the one during which carbide (Fe, Cr)_(23)C_6 precipitates along grain boundaries from the oversaturated austenite, and meanwhile, solute atoms, such as Cr, Ni and C, redistribute in the matrices.This process is simulated by computer calculation as reported in this paper.It is considered that the precipitation of the carbide is controlled by the diffusion of substitutional solute atoms, and the interface between the austenite and carbide can reach a thermodynamic equilibrium at a time.Through a dynamic supply of phase equilibrium information in Fe-Cr-Ni-G system, the boundary conditions of the diffusion process are determined; the distribution curves of solutes in the matrices are solved; and still further, the Temperature-Time-Sensitization (TTS) curves are predicted.The practical application of the above simulation has been conducted in austenitic stainless steels.A quantitative theoretical basis has been provided for the Cr-depleted theory on intergranular corrosion.
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Received: 25 August 1989
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