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Five-parameter crystallographic characteristics of the interfaces formed during ferrite to austenite transformation in a duplex stainless steel

journal contribution
posted on 2018-01-01, 00:00 authored by N Haghdadi, Pavel CizekPavel Cizek, Peter HodgsonPeter Hodgson, V Tari, G S Rohrer, Hossein BeladiHossein Beladi
The crystallography of interfaces in a duplex stainless steel having an equiaxed microstructure produced through the ferrite to austenite diffusive phase transformation has been studied. The five-parameter interface character distribution revealed a high anisotropy in habit planes for the austenite–ferrite and austenite–austenite interfaces for different lattice misorientations. The austenite and ferrite habit planes largely terminated on (1 1 1) and (1 1 0) planes, respectively, for the austenite–ferrite interfaces associated with Kurdjumov–Sachs (K–S) and Nishiyama–Wasserman (N–W) orientation relationships. This was mostly attributed to the crystallographic preference associated with the phase transformation. For the austenite–ferrite interfaces with orientation relationships which are neither K–S nor N–W, both austenite and ferrite habit planes had (1 1 1) orientations. Σ3 twin boundaries comprised the majority of austenite–austenite interfaces, mostly showing a pure twist character and terminating on (1 1 1) planes due to the minimum energy configuration. The second highest populated austenite–austenite boundary was Σ9, which tended to have grain boundary planes in the tilt zone due to the geometrical constraints. Furthermore, the intervariant crystallographic plane distribution associated with the K–S orientation relationship displayed a general tendency for the austenite habit planes to terminate with the (1 1 1) orientation, mainly due to the crystallographic preference associated with the phase transformation.

History

Journal

Philosophical magazine

Volume

98

Issue

14

Season

Part A: Materials Science

Pagination

1284 - 1306

Publisher

Taylor & Francis

Location

Abingdon, Eng.

ISSN

1478-6435

eISSN

1478-6443

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, Informa UK Limited