Abstract：Based on the carbon diffusivity obtained from the metal dusting corrosion experiment of Cr5Mo at 600 ℃ in H2/CO mixture gas,a coupling calculation method for thermal-elastic-plastic-diffusion has been developed with ABAQUS finite element code and its user subroutines of USDFLD,UEXPAN and UDIFF. According to this method,the internal stress of metal dusting corrosion layer for Cr5Mo was simulated and compared with that without consideration of diffusion-induced stress. The results show that the carbon diffusion-induced stress during the process of metal dusting is in a higher level. The surface of metal dusting corrosion layer and the interface between this layer and base material are the main high stress zone. The diffusion-induced stress possesses a high percent in the final internal stress of metal dusting corrosion layer. And it is one important reason to cause the metal dusting corrosion layer broken.
2009, Vol. 30 
