Abstract
Isothermal diffusion of carbon in ferritic and austenitic iron-chromium alloys has been investigated as a function of chromium concentrations ranging from 0 to 3.5 at% using C14 and conventional sectioning and counting techniques. Measurements at four temperatures from 716°C to 1082°C revealed that the diffusion coefficient for carbon decreases roughly 10% per at% of chromium concentration when a linear variation is assumed. A non-linear analysis shows a small maximum near 1 at% chromium in the austenitic alloys. These results are discussed in terms of a simple model for trapping of carbon atoms by chromium.
