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Orientation dependence of the deformation microstructure in a Fe-30Ni-Nb model austenitic steel subjected to hot uniaxial compression

Poddar, Debasis, Cizek, Pavel, Beladi, Hossein and Hodgson, Peter D. 2015, Orientation dependence of the deformation microstructure in a Fe-30Ni-Nb model austenitic steel subjected to hot uniaxial compression, Metallurgical and materials transactions A, vol. 46, no. 12, pp. 5933-5951, doi: 10.1007/s11661-015-3182-z.

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Title Orientation dependence of the deformation microstructure in a Fe-30Ni-Nb model austenitic steel subjected to hot uniaxial compression
Author(s) Poddar, Debasis
Cizek, Pavel
Beladi, Hossein
Hodgson, Peter D.
Journal name Metallurgical and materials transactions A
Volume number 46
Issue number 12
Start page 5933
End page 5951
Total pages 19
Publisher Springer
Place of publication New York, N.Y.
Publication date 2015-12
ISSN 1073-5623
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
PLANE-STRAIN COMPRESSION
INTERSTITIAL-FREE STEEL
SUBSTRUCTURE CHARACTERISTICS
DISLOCATION-STRUCTURES
GRAIN-ORIENTATION
ROLLED ALUMINUM
SINGLE-CRYSTAL
EVOLUTION
ALLOY
FE
Summary The present work was aimed at a detailed investigation of the orientation dependence of the microstructure characteristics in a Fe-30Ni-Nb austenitic model steel subjected to hot uniaxial compression at 1198 K (925 °C) at a strain rate of 1 s−1 to several strain levels up to 1.0. The quantification of the substructure evolution as a function of strain was performed for the stable 〈011〉 oriented grains. Other grain orientations were also investigated in detail at a strain of 0.2. The 〈110〉 oriented grains contained self-screening arrays of “microbands” (MBs) aligned with high Schmid factor {111} slip planes. The MB crystallographic alignment was largely maintained up to a strain of 1.0, which suggests that the corresponding boundaries kept continuously rearranging themselves during straining and did not follow the sample shape change. The mean MB spacing decreased and misorientation angle increased with strain towards saturation, indicating the operation of the “repolygonization” dynamic recovery mechanism. The non-〈011〉 oriented grains displayed a strong tendency to split during deformation into deformation bands having alternating orientations and being mutually rotated by large angles. The bands were separated by transition regions comprising arrays of closely spaced, extended sub-boundaries collectively accommodating large misorientations across very small distances.
Language eng
DOI 10.1007/s11661-015-3182-z
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0306 Physical Chemistry (Incl. Structural)
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 ©2015, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30082135

Document type: Journal Article
Collection: Institute for Frontier Materials
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