Growth Kinetics of Al-Si-Fe Intermetallics during Hot Dipping of Steel
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Published:2008-02
Issue:
Volume:273-276
Page:58-62
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ISSN:1662-9507
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Container-title:Defect and Diffusion Forum
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language:
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Short-container-title:DDF
Author:
Rodriguez-Calvillo Pablo1,
Rouco R.2,
Houbaert Yvan2
Affiliation:
1. CTM - Technologic Centre
2. Ghent University
Abstract
Electrical steels are used in flux carrying machines, divided in grain oriented and non
oriented electrical steels mainly used in transformers and electrical motors, respectively. Their
industrial production is not always easy due to the alloying elements which produce brittle order
structures in the steel. Therefore hot dipping was found to be an alternative way of producing
electrical steel with a high concentration of Al and/or Si: in a first series of experiments different
steel substrates were coated by immersion in an Al + 23 m.-% Si hypereutectic alloy, followed by a
high temperature diffusion annealing.
The present contribution reports on the growth kinetics of Al-Si-Fe intermetallics formed during
the dipping process in a hypoeutectic Al – 5 m.-% Si bath of Fe-substrates with 3 m.-% Si,
previously cold rolled to different thickness. This bath composition allows a liquid phase at
temperatures lower than the hypereutectic one with 23 m.-% Si and also less amount of eutectic
formation. No Na-addition was made to the bath (the occurrence of a needle-like morphology of the
Al-Si eutectic was not relevant for these experiments), furthermore this element might lower the
magnetic properties of the steel. The preheating of samples and bath temperatures were not varied
and set to 670°C. Short dipping times of 1 to 60 sec. were applied. The different layers formed were
characterised by Scanning Electron Microscopy (SEM), using the Back Scattered Electron (BSE)
detector and Energy Dispersive Spectroscopy (EDS).
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Radiation
Cited by
1 articles.
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