Analytical electron microscopy was used to measure the composition of GBs (grain boundaries) and IBs (interconstituent boundaries) of X52 pipeline steel using specimens about 40-60 nm in thickness. All elements of interest were examined with the exception of carbon. With this caveat, there was no segregation at proeutectoid ferrite GBs. This indicated that the commonly expected species S and P are not responsible for preferential corrosion of GBs during intergranular stress corrosion cracking of pipeline steels. Manganese was the only species measured to segregate at the IBs. Manganese segregated to the IBs between proeutectoid ferrite and pearlitic cementite, and desegregated from IBs between proeutectoid ferrite and pearlitic ferrite. The pearlitic cementite was Mn rich. There was no Mn segregation at the IBs between pearlitic ferrite and perlitic cementite. The pattern of Mn segregation could be explained in terms of diffusion in the process zone ahead of the pearlite during the austenite to perlite transformation and diffusion in the IBs between the proeutectoid ferrite and pearlite.
Measurement of grain boundary composition for X52 pipeline steel
Messung der Korngrenzenzusammensetzung am X52-Pipelinestahl
Acta Materialia ; 46 , 16 ; 5677-5687
1998
11 Seiten, 13 Bilder, 2 Tabellen, 40 Quellen
Aufsatz (Zeitschrift)
Englisch
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