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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/19003

Title: Inclusion Characterization in High Strength Low Alloy Steel
Authors: Wu, Chao Peng Paul
Advisor: McLean, Alexander
Department: Materials Science and Engineering
Keywords: Steel Cleanliness
Non-metallic Inclusions
Issue Date: 17-Feb-2010
Abstract: The cleanliness of high strength low alloy (HSLA) steel was assessed qualitatively and quantitatively. The determination of inclusion type and inclusion morphology were carried out using Selective Potentiostatic Etching by Electrolytic Dissolution (SPEED) method allowing in-situ examination of inclusion morphology by analytical techniques such as SEM/EDS. Inclusion size analysis mainly involved a combination of an analytical technique to provide images of the sample surface and an image analysis system to accurately measure the inclusion size. Four analytical methods were compared in order to evaluate their suitability for subsequent quantitative analysis. It was found that images taken with backscattered electron imaging mode from the scanning electron microscope provides the most accurate representation of inclusion distribution. The various techniques were used to evaluate HSLA steel grades of similar chemistry produced with and without gas shrouding. The results confirmed that with reoxidation minimized by gas shrouding between ladle and tundish, the steel cleanliness was significantly improved.
URI: http://hdl.handle.net/1807/19003
Appears in Collections:Master
Department of Materials Science & Engineering - Master theses

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