Abstract
AbstractFour 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 ferritic iron steels—in the austenitic range for FeP, FeMnP, FeCP and FePB alloys. Also, in Ni20% Cr the grain boundary segregation of P and its effects on carbide precipitation were investigated.On surfaces of ternary alloys FeMI, co‐segregation of the metal M and non‐metal element I can lead to the formation of two‐dimensional or three‐dimensional surface compounds, as demonstrated for the system FeCrN. The formation of such nitrides in the first transient state of the oxidation of high‐temperature alloys can strongly deteriorate the protective properties of the chromia layer formed—as shown for the oxidation of Fe20% Cr in N2H2OH2.
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