Influence of Alloying on the Diffusion of Elements in Chromium-Nickel Steels

摘要

The dependence of diffusion coefficients of iron, chromium, and nickel on temperature in austenitic chromium-nickel steels containing up to 4% silicon and and up to 2% molybdenum are measured. It is shown that alloying of steel with silicon leads to the increase of the activation energy of diffusion of iron, chromium, and nickel and to the decrease of the diffusion coefficients of the indicated elements in temperatures lower than 900C. The addition of up to 2% molybdenum to steel, which contains 2.5% silicon, also increases the activation energy of self-diffuson of iron and decreases the self-diffusion coefficients by the decrease of temperature. However alloying with molybdenum shows an opposite effect on the diffusion of chromium.