Contributions of AES in four metallurgical studies

Abstract

Four recent studies are reported characterizing the possible contributions of surface science to metallurgy. The grain boundary segregation of phosphorus was studied by AES analyses of fractured specimens-after many studies on femtic iron steels-in the austenitic range for Fe-P, Fe-Mn-P, FeC-P and Fe-P-B alloys. Also, in N~2 0 % C r the grain boundary segregation of P and its effects on carbide precipitation were investigated. On surfaces of ternary alloys Fe-M-I, co-segregation of the metal M and ooo-metal element I can lead to the formation of two-dimensional or three-dimensional surface compounds, as demonstrated for the system FeCr-N. The formation of such nitrides in the first transient state of tbe oxidation of high-temperature alloys can strongly deteriorate the protective properties of the chromia layer formed-as shown for the oxidation of Fe-tO%Cr in