Abstract
Stainless steel samples doped with various contents of Sb were crept under the same conditions. With respect to the base material, a low content of Sb (0.1 wt pct or 0.2 wt pct) is found to improve creep strength and creep ductility of the alloys whereas the addition of 1 wt pct Sb decreases the mechanical properties. The microstructure of the samples was examined quantitatively by scanning electron microscopy. The improvement of mechanical properties is attributed to a reduction of the nucleation rate and of the growth rate of cavities. In order to predict the strain to fracture, a criterion on the fraction of grain boundary area cavitated is proposed.
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