Assessment and Evaluation of Mobilities for Diffusion in the bcc Cr-Mo-Fe System

Abstract

An assessment of the diffusion mobility functions for diffusion in the bcc Cr-Fe-Mo system is presented. The optimization of the mobility parameters is performed by utilizing experimental diffusion data available in literature. New diffusion data for the Mo diffusion is produced by a diffusion couple experiment and is accounted for in the optimization. Agreement between calculated and measured diffusion coefficients is found. An M 6 C coarsening experiment is performed and the measured coarsening rate can be reproduced by diffusion calculation using the DICTRA software and the developed kinetic description. The mobility parameters are shown to have a strong influence on the calculated coarsening rate.

Interdiffusion of Solute Elements in the <i>α</i>-Fe Phase of the Fe–Cr–Mo and Fe–Cr–Si Ternary Systems

“…Cr is in good agreement with the results revealed by Lindwall and Frisk 33) , where tracer diffusion coefficients of Mo in the α-Fe phase of Fe-Cr alloys decrease as that of Cr increases with range of 8 -12 or 1.75 -17.1 wt. %.…”

“…%) Mo, 2.65 × 10 −16 m 2 s −1 , slightly decreases to be 2.19 × 10 −16 m 2 s −1 in -1.5Mo reported by Nitta et al. 31) In the regards of Fe-Cr-Mo ternary system, the tracer diffusion of Mo in the α-Fe of Fe-Cr alloy with variation of Cr content 33) and interdiffusion of solute elements in the γ-Fe phase of Fe-Cr-Mo 34) have been studied. However, information on the interdiffusion of solute elements in αFe of Fe-Cr-Mo system have not been unavailable now.…”