Softening mechanisms in two duplex stainless steels deformed in hot torsion

Cizek, P. 2004, Softening mechanisms in two duplex stainless steels deformed in hot torsion, Materials science forum, vol. 467 - 470, Recrystallization and grain growth, pp. 1157-1162.

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Title Softening mechanisms in two duplex stainless steels deformed in hot torsion
Author(s) Cizek, P.
Journal name Materials science forum
Volume number 467 - 470
Season Recrystallization and grain growth
Start page 1157
End page 1162
Publisher Trans Tech
Place of publication Stafa-Zurich, Switzerland
Publication date 2004-10
ISSN 0255-5476
Keyword(s) dislocation substructure
duplex stainless steels
dynamic recovery
dynamic recrystalization (DRX)
hot torsion
transmission electron microscopy (TEM)
Summary The aim of the present work was to undertake a detailed investigation of the softening mechanisms during hot deformation of a 21Cr-10Ni-3Mo (steel A) and a 21Cr-8Ni-3Mo (steel B) austenite/ferrite duplex stainless steels containing about 60% and 30% of austenite, respectively. The steels were subjected to hot deformation in torsion performed at 900 ºC and 1200 ºC using a strain rate of 0.7 s-1 to several strain levels. Quantitative optical and transmission electron microscopy were used in the investigation. Austenite was observed to soften via dynamic recovery (DRV) and dynamic recrystallisation (DRX) accompanied by DRV for the deformation temperatures of 900 °C and 1200 °C, respectively, for the both steels studied. DRX of austenite largely occurred through strain-induced grain boundary migration, complemented by (multiple) twinning, and developed significantly faster in steel A than in steel B, indicating that considerably larger strains partitioned into austenite in the former steel during deformation at 1200 °C. The above softening mechanism was accompanied by the formation of DRX grains from subgrains along the austenite/ferrite interface and by large-scale subgrain coalescence. At 900°C, stressassisted phase transitions between austenite and ferrite were observed, characterised by dissolution of the primary austenite, formation of Widmanstätten secondary austenite and gradual globularisation of the microstructure with increasing strain. These processes appeared to be significantly more widespread in steel B. The softening mechanism within ferrite for the both steels studied was classified as “continuous DRX”, characterised by a gradual increase in misorientations between neighbouring subgrains with strain, for the both deformation temperatures.
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2004, Trans Tech Publications, Switzerland
Persistent URL http://hdl.handle.net/10536/DRO/DU:30025769

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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