Chemische Diffusion von Molybdän in hochlegierten austenitischen CrNiMo(N)-Stählen

Interdiffusion of Molybdenum in High-Alloy Austenitic CrNiMo(N)-Steels The Volume diffusion of Mo in austenitic CrNiMo(N)-steels was studied using the sandwich method. Accordingly the interdiffusion coefficients of Mo were found to be independent of its concentration for the given steel compositions with 12 to 19 wt.% Cr, 12 to 16wt.% Ni, 0 to 2 wt.% Mo and 0 to 0.27 wt.% N and within the temperature range from 1283 to 1523 K. The diffusivity of Mo is greater than that of Cr, Ni and Fe in such steels. The diffusion parameters of Mo are decreased by alloying addition of nearly 0.25 wt.% N in Steel; possibly as a result of lattice expansion or increasing vacancy concentration caused by N. Small variations in Cr and Ni initial contents of examined specimens showed negligible effect on the absolute values of interdiffusion coefficients of Mo.