Abstract: Considering the effect of intergranular carbides density,a modified model has been proposed to try to suit any common case of the fraction of intergranular carbides to total grain bounda- ry less than I,on the basis of the previous model for the grain boun dary precipitation strengthening.This modified model may by avilable to predict the changes in creep rate and its stress and temperature dependence of alloys due to intergrnular carbides.

Key words: intergranular carbide, creep, Fe-15Cr-25Ni alloy, boundary obstacle stress