Structural characterization of rapidly solidified white cast iron powders

Three white cast iron alloy powders (2.4, 3.0 and 3.0% carbon + 1.5% Cr) manufactured by a rapid solidification processing technique were investigated. It was found that the microstructures of all three alloy powders were similar. The primary constituent of these powders was found to be retained aus...

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Bibliographic Details
Published in:Journal of materials science 1983-02, Vol.18 (2), p.483-492
Main Authors: Eiselstein, L E, Ruano, O A, Sherby, O D
Format: Article
Language:English
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Summary:Three white cast iron alloy powders (2.4, 3.0 and 3.0% carbon + 1.5% Cr) manufactured by a rapid solidification processing technique were investigated. It was found that the microstructures of all three alloy powders were similar. The primary constituent of these powders was found to be retained austenite. Only small amounts of carbide and martensite were found. The primary austenite cells and dendrites that nucleate and grow from the melt are retained upon cooling to room temp. with little carbide precipitation. A fine dispersion of carbides in an austenite matrix is formed as a result of the solidification of the eutectic liquid in the intercellular and interdendritic regions. Annealing of the powders at 650 deg C transforms the metastable austenite into alpha iron and carbide. The carbides have a bimodal distribution with small carbides precipitating within the primary austenite cells and dendrites and large carbides precipitating within the intercellular and interdendritic regions. 26 ref.--AA
ISSN:0022-2461
1573-4803
DOI:10.1007/bf00560637