Oloyede, O, Bigg, TD, Cochrane, RF et al. (1 more author) (2016) Microstructure evolution and mechanical properties of drop-tube processed, rapidly solidified grey cast iron. Materials Science and Engineering A, 654. pp. 143-150. ISSN 0921-5093
Abstract
The microstructure, phase composition and microhardness of rapidly solidified grey cast iron BS1452 Grade 250 are compared against the conventionally solidified alloy. Powder samples were prepared using containerless processing via the drop-tube technique. The rapidly cooled droplets were collected and sieved into size range from ≥850μm to ≤53μm diameters corresponding to estimated rates of 200-23,000Ks-1. Microstructure evaluations were made by optical and scanning electron microscopy, while XRD was used for identification and analysis of evolved phases. The control sample showed extensive graphite flake formation which was absent in virtually all the droplets samples. With decreasing particle size (increasing cooling rate) we observed an increase in the proportion of Fe3C present and the retention of γ-Fe in preference to α-Fe, with the proportion of retained austenite increasing with increasing cooling rate. At the highest cooling rates utilised a Martensitic or acicular ferrite structure was observed. Cooling rates of 200Ks-1 resulted in a doubling of the measured microhardness relative to the as-received (slowly cooled) material. Cooling at the highest rates achieved resulted in a further doubling of the measured microhardness.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c)2015 Elsevier B.V. All rights reserved.This is an author produced version of a paper published in Materials Science and Engineering: A. Uploaded in accordance with the publisher's self-archiving policy |
Keywords: | Rapid solidification; Drop tube; Grey cast iron; Cooling rate; Microstructure; Microhardness |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Materials Research (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Jan 2016 15:23 |
Last Modified: | 12 Dec 2016 20:40 |
Published Version: | http://dx.doi.org/10.1016/j.msea.2015.12.020 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.msea.2015.12.020 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:93623 |