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Investigation on the behavior of austenite and ferrite phases at stagnation region in the turning of duplex stainless steel alloys

Nomani, J., Pramanik, A., Hilditch, T. and Littlefair, G. 2016, Investigation on the behavior of austenite and ferrite phases at stagnation region in the turning of duplex stainless steel alloys, Metallurgical and materials transactions a, vol. 47, no. 6, pp. 3165-3177, doi: 10.1007/s11661-016-3472-0.

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Title Investigation on the behavior of austenite and ferrite phases at stagnation region in the turning of duplex stainless steel alloys
Author(s) Nomani, J.
Pramanik, A.
Hilditch, T.ORCID iD for Hilditch, T. orcid.org/0000-0003-0300-5774
Littlefair, G.
Journal name Metallurgical and materials transactions a
Volume number 47
Issue number 6
Start page 3165
End page 3177
Total pages 13
Publisher Springer
Place of publication New York, N.Y.
Publication date 2016-06
ISSN 1073-5623
Summary This paper investigates the deformation mechanisms and plastic behavior of austenite and ferrite phases in duplex stainless steel alloys 2205 and 2507 under chip formation from a machine turning operation. SEM images and EBSD phase mapping of frozen chip root samples detected a build-up of ferrite bands in the stagnation region, and between 65 and 85 pct, more ferrite was identified in the stagnation region compared to austenite. SEM images detected micro-cracks developing in the ferrite phase, indicating ferritic build-up in the stagnation region as a potential triggering mechanism to the formation of built-up edge, as transgranular micro-cracks found in the stagnation region are similar to micro-cracks initiating built-up edge formation. Higher plasticity of austenite due to softening under high strain is seen responsible for the ferrite build-up. Flow lines indicate that austenite is plastically deforming at a greater rate into the chip, while ferrite shows to partition most of the strain during deformation. The loss of annealing twins and activation of multiple slip planes triggered at high strain may explain the highly plastic behavior shown by austenite.
Language eng
DOI 10.1007/s11661-016-3472-0
Field of Research 091207 Metals and Alloy Materials
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, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083529

Document type: Journal Article
Collection: School of Engineering
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