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Core-Shell Structure of Intermediate Precipitates in a Nb-Based Z-Phase Strengthened 12% Cr Steel

Masoud Rashidi (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Hans-Olof Andrén (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Fang Liu (Institutionen för fysik, Materialens mikrostruktur (Chalmers))
Microscopy and Microanalysis (1431-9276). Vol. 23 (2017), 2, p. 360-365.
[Artikel, refereegranskad vetenskaplig]

In creep resistant Z-phase strengthened 12% Cr steels, MX (M=Nb, Ta, or V, and X=C and/or N) to Z-phase (CrMN, M=Ta, Nb, or V) 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.

Nyckelord: 9-12% Cr steels, Atom probe tomography, local magnification, phase transformation, precipitates, Z-phase



Denna post skapades 2017-08-11. Senast ändrad 2017-08-11.
CPL Pubid: 251071

 

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Institutioner (Chalmers)

Institutionen för fysik, Materialens mikrostruktur (Chalmers)

Ämnesområden

Fysik
Materialteknik

Chalmers infrastruktur