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Calorimetric study and microstructure analysis of the order-disorder phase transformation in silicon steel built by SLM

Lemke, J.N.; Simonelli, M.; Garibaldi, M.; Ashcroft, I.; Hague, R.; Vedani, M.; Wildman, Ricky D.; Tuck, C.

Calorimetric study and microstructure analysis of the order-disorder phase transformation in silicon steel built by SLM Thumbnail


Authors

J.N. Lemke

M. Garibaldi

IAN ASHCROFT IAN.ASHCROFT@NOTTINGHAM.AC.UK
Professor of Mechanics of Solids

RICHARD HAGUE RICHARD.HAGUE@NOTTINGHAM.AC.UK
Professor of Additive Manufacturing

M. Vedani

RICKY WILDMAN RICKY.WILDMAN@NOTTINGHAM.AC.UK
Professor of Multiphase Flow and Mechanics

CHRISTOPHER TUCK CHRISTOPHER.TUCK@NOTTINGHAM.AC.UK
Professor of Materials Engineering



Abstract

Innovative Additive Manufacturing (AM) technologies like Selective Laser Melting (SLM) could prove to be efficient for the processing of brittle silicon steel (Fe-Si) with high silicon content. This research elucidates the effects of heat-treatment on the microstructure of SLM-built high silicon steel, with particular emphasis on the formation of ordered phases, which are known to cause undesired material embrittlement.

Silicon steel with 6.9 wt % Si is produced by SLM and investigated performing Differential Scanning Calorimetry (DSC), microstructure analysis and hardness measurements. As-built Fe-Si parts are found to consist primarily of disordered A2 phase as the high cooling rates typical of SLM suppress the ordering phase transformations. It is shown how heat treatments can be applied to modify the state of ordering and morphology of the rapidly solidified microstructure. By shedding light on the phase-ordering mechanisms and the effect of heat treatments on microstructure of high-Si steel built by SLM, the present study paves the way towards the optimisation of the mechanical and magnetic properties of this alloy.

Journal Article Type Article
Acceptance Date Jun 7, 2017
Online Publication Date Jun 10, 2017
Publication Date Oct 25, 2017
Deposit Date Jun 14, 2017
Publicly Available Date Jun 14, 2017
Journal Journal of Alloys and Compounds
Print ISSN 0925-8388
Electronic ISSN 1873-4669
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 722
Pages 293-301
DOI https://doi.org/10.1016/j.jallcom.2017.06.085
Keywords Selective Laser Melting (SLM); Differential Scanning Calorimetry (DSC); Microstructure; Silicon steel; Heat-treatment; Ordering phase transformations
Public URL https://nottingham-repository.worktribe.com/output/889254
Publisher URL http://www.sciencedirect.com/science/article/pii/S092583881732073X
Additional Information This article is maintained by: Elsevier; Article Title: Calorimetric study and microstructure analysis of the order-disorder phase transformation in silicon steel built by SLM; Journal Title: Journal of Alloys and Compounds; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jallcom.2017.06.085; Content Type: article; Copyright: © 2017 Elsevier B.V. All rights reserved.

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