Novel ultrafine Fe(C) precipitates strengthen transformation-induced-plasticity steel

Title

Novel ultrafine Fe(C) precipitates strengthen transformation-induced-plasticity steel

 Author

Tirumalasetty, G.K.
Fang, C.M.
Xu, Q.
Jansen, J.
Sietsma, J.
Van Huis, M.A.
Zandbergen, H.W.

Faculty

Applied Sciences

 Department

Kavli Institute of Nanoscience

 Programme

High Resolution Electron Microscopy (HREM)

 Date

2012-10-05

 Abstract

A transmission electron microscopy study was conducted on nanoprecipitates formed in Ti microalloyed transformation-inducedplasticity-assisted steels, revealing the presence of Ti(N), Ti2CS and a novel type of ultra-fine Fe(C) precipitate. The matrix/precipitate orientation relationships, sizes and shapes were investigated in detail. The ultrafine, disc-shaped Fe(C) precipitates have sizes of 2–5 nm and possess a hexagonal close packed crystal structure with lattice parameters a = 5.73 ± 0.05A ? , c = 12.06 ± 0.05A ?. They are in a well-defined Pitsch–Schrader orientation relationship with the basal plane of the precipitate parallel to the [110] habit plane of the surrounding body-centred-cubic ferritic matrix. Detailed analysis of precipitate distribution, orientation relationship, lattice mismatch and inter-particle spacing suggests that these ultrafine precipitates contribute considerably to the strengthening of these steels.

 Subject

TRIP assisted steel
iron carbides
precipitation
transmission electron microscopy

 To reference this document use:

http://resolver.tudelft.nl/uuid:6fc0353e-2287-45d4-b330-b181d4d35c6f

 DOI

https://doi.org/10.1016/j.actamat.2012.09.025

 Publisher

Elsevier

 ISSN

1359-6454

 Source

http://www.sciencedirect.com/science/article/pii/S1359645412006489

 Source

Acta Materialia, 60 (20), 2012 “NOTICE: this is the author’s version of a work that was accepted for publication in Acta Materialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Acta materialia, vol. 60, no. 20, October 2012”

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

(c) 2012 The authors
Elsevier
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