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

journal contribution
posted on 2016-08-01, 00:00 authored by D Poddar, Pavel CizekPavel Cizek, Hossein BeladiHossein Beladi, Peter HodgsonPeter Hodgson
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.

History

Journal

Materials characterization

Volume

118

Pagination

382 - 396

Publisher

Elsevier

Location

Amsterdam< The Netherlands

ISSN

1044-5803

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2016, Elsevier