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Concurrent phase separation and clustering in the ferrite phase during low temperature stress aging of duplex stainless steel weldments

J. Zhou ; J. Odqvist ; Mattias Thuvander (Institutionen för teknisk fysik, Mikroskopi och mikroanalys ; Institutionen för teknisk fysik, Materialens mikrostruktur ) ; S. Hertzman ; P. Hedstrom
Acta Materialia (1359-6454). Vol. 60 (2012), 16, p. 5818-5827.
[Artikel, refereegranskad vetenskaplig]

The concurrent phase separation and clustering of alloying elements in the ferrite phase of duplex stainless steel weldments after stress aging at 325 degrees C have been investigated by atom probe tomography analysis. Both phase separation, into Fe-rich and Cr-rich ferrite, and solute clustering were observed. Phase separation in the heat-affected zone (HAZ) is most pronounced in the high alloyed SAF 2507, followed by SAF 2205 and SAF 2304. Moreover Cu clustering was observed in the HAZ of SAF 2507. However, decomposition in the weld bead (25.10.4L) was more pronounced than in the HAZs, with both phase separation and clustering of Ni-Mn-Si-Cu. The observed differences in the decomposition behaviors in the HAZ and weld bead can be attributed to the high Ni content and the characteristic microstructure of the weld bead with high internal strains. In addition, an applied tensile stress during aging of weldments has been found to further promote the kinetics of phase separation and clustering.

Nyckelord: Duplex stainless steels, Phase separation, Atom probe tomography, Spinodal decomposition, fe-cr system, spinodal decomposition, atom-probe, electron-microscopy, evolution, alloys, ni



Denna post skapades 2012-11-08. Senast ändrad 2014-09-02.
CPL Pubid: 165697

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Mikroskopi och mikroanalys (2005-2012)
Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Materialteknik

Chalmers infrastruktur