Microstructure characteristics of the (111) oriented grains in a Fe-30Ni-Nb model austenitic steel deformed in hot uniaxial compression

Poddar, Debasis, Cizek, Pavel, Beladi, Hossein and Hodgson, Peter D 2016, Microstructure characteristics of the (111) oriented grains in a Fe-30Ni-Nb model austenitic steel deformed in hot uniaxial compression, Materials characterization, vol. 118, pp. 382-396, doi: 10.1016/j.matchar.2016.06.015.

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Title Microstructure characteristics of the (111) oriented grains in a Fe-30Ni-Nb model austenitic steel deformed in hot uniaxial compression
Author(s) Poddar, Debasis
Cizek, Pavel
Beladi, HosseinORCID iD for Beladi, Hossein orcid.org/0000-0003-0131-707X
Hodgson, Peter D
Journal name Materials characterization
Volume number 118
Start page 382
End page 396
Total pages 15
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-08
ISSN 1044-5803
Keyword(s) Austenite
Hot compression
〈111〉 fibre grains
Deformation bands
Microbands
Summary The work presents a detailed investigation of the microstructure characteristics of the (111) oriented grains in a Fe-30Ni-Nb austenitic model steel subjected to hot uniaxial compression at 925 °C at a strain rate of 1 s- 1. The above grains exhibited a tendency to split into deformation bands having alternating orientations and largely separated by transition regions comprising arrays of closely spaced, extended sub-boundaries collectively accommodating large misorientations across very small distances. On a fine scale, the (111) oriented grains typically contained a mix of "microbands" (MBs) closely aligned with {111} slip planes and those significantly deviated from these planes. The above deformation substructure thus markedly differed from the microstructure type, comprising strictly non-{111} aligned MBs, expected within such grains on the basis of the uniaxial compression experiments performed using aluminium. Both the crystallographic MBs and their non-crystallographic counterparts typically displayed similar misorientations and formed self-screening arrays characterized by systematically alternating misorientations. The crystallographic MBs were exclusively aligned with {111} slip planes containing slip systems whose sum of Schmid factors was the largest among the four available slip planes. The corresponding boundaries appeared to mainly display either a large twist or a large tilt component.
Language eng
DOI 10.1016/j.matchar.2016.06.015
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30084795

Document type: Journal Article
Collections: Institute for Frontier Materials
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