Abstract
Creep behavior of carbon free 17Cr-14Ni austenitic steels containing tungsten up to twelve per cent has been studied in relation to precipitation processes of μ and Laves phases.
Decrease in minimum creep rate with the addition of up to about three per cent tungsten was attributed to the solid solution strengthening due to tungsten. On the other hand, in the case of steels with more than five per cent tungsten, the remarkable decrease in minimum creep rate was found with increase in tungsten content, and intergranular precipitation of μ phase (Fe7W6) was also observed. Then it has been concluded that the intergranular precipitation of μ phase plays an important role in high temperature creep resistance of austenitic heat resisting steels containing tungsten.
