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Atom probe study of MX to Z-phase transformation in Z-phase strengthened 12%Cr steels

Masoud Rashidi (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Hans-Olof Andrén (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Fang Liu (Institutionen för industri- och materialvetenskap, Material- och tillverkningsteknik)
Microscopy and Microanalysis (1431-9276). Vol. 23 (2017), p. 360-365.
[Artikel, refereegranskad vetenskaplig]

In creep resistant Z-phase strengthened 12% Cr steels, MX to Z-phase transformation plays an important role in achieving a fine distribution of Z-phase precipitates for creep strengthening. Atom probe tomography was employed to investigate the phase transformation in a Nb-based Z-phase strengthened trial steel. Using iso-concentration surfaces with different concentration values, and subtracting the matrix contribution enabled us to reveal the core-shell structure of the transient precipitates between MX and Z-phase. It was shown that Z-phase forms by diffusion of Cr into NbN upon ageing, and Z-phase has a composition corresponding to Cr1+xNb1-xN with x=0.08.



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Denna post skapades 2017-06-21.
CPL Pubid: 250040