Abstract
The deleterious effects on the mechanical properties of phosphorus segregation to grain boundaries in ferritic alloys are well documented in the metallurgical literature. An understanding of this recurring problem has profited from the recent application of analytical electron microscopy (AEM). EDS analysis has allowed the detection of phosphorus in thin films at prior austenite grain boundaries and in association with intergranular carbides. Although austenitic alloys also suffer from property degradation due to segregated impurity elements, comparable studies have not been conducted on these materials. The purpose of this paper, therefore, is to report the results from an AEM investigation of phosphorus segregation in an austenitic stainless steel. Of particular concern is the effect of grain boundary type on phosphorus segregation and precipitation.An Fe-18 Cr-10 Ni-0.3P (weight percent) steel was quenched from 1150°C and aged between 400-700°C. Samples were prepared by standard polishing techniques; those samples analyzed by EDS were lightly ion-beam milled to remove surface films formed by the electropolishing.
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