A TEM study of the crystallography of austenite precipitates in a duplex stainless steel

Qiu, D. and Zhang, W. -Z. (2007) A TEM study of the crystallography of austenite precipitates in a duplex stainless steel. Acta Materialia, 55 20: 6754-6764.


Author Qiu, D.
Zhang, W. -Z.
Title A TEM study of the crystallography of austenite precipitates in a duplex stainless steel
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2007-12
Sub-type Article (original research)
DOI 10.1016/j.actamat.2007.08.024
Volume 55
Issue 20
Start page 6754
End page 6764
Total pages 11
Place of publication Kidlington, Oxford, UK
Publisher Pergamon Elsevier Science
Language eng
Subject C1
861203 Metal Castings
091207 Metals and Alloy Materials
Formatted abstract The ferrite → austenite transformation in a duplex stainless steel serves as a good model alloy for studying body-centered cubic (bcc) → face-centered cubic (fcc) transformations in metals and alloys. However, the morphology and crystallography of austenite precipitates have not been well understood. A detailed TEM study was made on the crystallography of austenite precipitates to improve the understanding of this transformation. The orientation relationship (OR) was reassessed by an OR matrix to characterize the three-dimensional crystallography between austenite and ferrite. Meanwhile, interfacial dislocation structures were investigated for all of the three prominent facets by using the Δg method and the dislocation contrast extinction method. Each facet was found to contain a set of dislocations parallel to the long axis of precipitates. Their Burgers vectors have been characterized; one of them, the Burgers vector [0 0 1]fmid[0 0 1]b, is reported for the first time in an fcc/bcc system. The O-line model was applied to explain the observations, and produced consistent results. However, some features cannot be explained by the O-line model. These will be further rationalized in the next paper.
Keyword phase transformations
Crystallography
Interface
Dislocation structure
TEM
Q-Index Code C1
Additional Notes Available online 24 October 2007. -- Referred to by: Corrigendum to “A TEM study of the crystallography of austenite precipitates in a duplex stainless steel” [Acta Mater. 55 (2007) 6754–6764] Acta Materialia, Volume 56, Issue 8, May 2008, Page 1897, D. Qiu, W.-Z. Zhang

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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