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Hot deformation and restoration mechanisms in duplex stainless steels: effect of strain rate

conference contribution
posted on 2017-09-01, 00:00 authored by N Haghdadi, Pavel CizekPavel Cizek, Hossein BeladiHossein Beladi, Peter HodgsonPeter Hodgson
In the current study, the microstructural evolution has been investigated for a 2205 duplex stainless steel during uniaxial hot compression at a temperature of 1000 C at different strain rates in the range of 0.1-50 s−1. It was found that the strain rate changed the dynamic restoration mechanism in ferrite. At strain rates below 1 s-1, ferrite underwent continuous dynamic recrystallization characterized by a gradual increase in misorientation angles between adjacent subgrains. When the strain rate exceeded the above value, ferrite tended to soften through the discontinuous dynamic recrystallization (DDRX) mechanism associated with nucleation and growth of new grains. Austenite showed rather similar microstructure characteristics for different strain rates. The majority of austenitic grains experienced dynamic recovery accompanied at high strain values by a small fraction of new DDRX grains. The main feature of the austenite phase was the profuse formation of deformation bands separated by transition regions and locally containing microband (MB) arrays. It was found that, independent of the orientation of austenite grains, MB boundaries were typically aligned with high Schmid factor {111} slip planes.

History

Pagination

5-16

Location

Bergamo, Italy

Start date

2017-05-25

End date

2017-05-27

ISBN-13

9788898990122

Language

eng

Publication classification

E1 Full written paper - refereed

Copyright notice

2017, AIM - Associazione Italiana di Metallurgia

Editor/Contributor(s)

[Unknown]

Title of proceedings

ESSC and DUPLEX 2017 : Proceedings of the 9th European Stainless Steel Conference - Science and Market and the 5th European Duplex Stainless Steel Conference and Exhibition

Event

Italian Association for Metallurgy. Conference (2017 : Bergamo, Italy)

Issue

9

Publisher

Italian Association for Metallurgy

Place of publication

Milano, Italy

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