Microstructure evolution and softening processes in hot deformed austenitic and duplex stainless steels

Cizek, Pavel 2013, Microstructure evolution and softening processes in hot deformed austenitic and duplex stainless steels, Materials science forum, vol. 753, pp. 66-71, doi: 10.4028/www.scientific.net/MSF.753.66.

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Title Microstructure evolution and softening processes in hot deformed austenitic and duplex stainless steels
Author(s) Cizek, Pavel
Journal name Materials science forum
Volume number 753
Start page 66
End page 71
Total pages 6
Publisher Trans Tech Publications
Place of publication Stafa-Zurich, Switzerland
Publication date 2013
ISSN 0255-5476
Keyword(s) austenitic stainless steel
deformation microstructure
duplex stainless steel
dynamic recrystallization
hot torsion
shear bands
subgrain coalescence
Summary The microstructure evolution and softening processes occurring in 22Cr-19Ni-3Mo austenitic and 21Cr-10Ni-3Mo duplex stainless steels deformed in torsion at 900 and 1200 °C were studied in the present work. Austenite was observed to soften in both steels via dynamic recovery (DRV) and dynamic recrystallisation (DRX) for the low and high deformation temperatures, respectively. At 900 °C, an "organised", self-screening austenite deformation substructure largely comprising microbands, locally accompanied by micro-shear bands, was formed. By contrast, a "random", accommodating austenite deformation substructure composed of equiaxed subgrains formed at 1200 °C. In the single-phase steel, DRX of austenite largely occurred through straininduced grain boundary migration accompanied by (multiple) twinning. In the duplex steel, this softening mechanism was complemented by the formation of DRX grains through subgrain growth in the austenite/ferrite interface regions and by large-scale subgrain coalescence. At 900 °C, the duplex steel displayed limited stress-assisted phase transformations between austenite and ferrite, characterised by the dissolution of the primary austenite, formation of Widmanstätten secondary austenite and gradual globularisation of the transformed regions with strain. The softening process within ferrite was classified as "extended DRV", characterised by a continuous increase in misorientations across the sub-boundaries with strain, for both deformation temperatures.
Language eng
DOI 10.4028/www.scientific.net/MSF.753.66
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861206 Structural Metal Products
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30055440

Document type: Journal Article
Collection: Institute for Frontier Materials
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