Solidification microstructures induced by laser surface alloying: influence of the substrate

Surface-treated alloys have been realized on both aluminium-based and iron-based substrates, by laser melting of a nickel predeposited layer. Microstructures have been characterized by optical and scanning electron microscopies and microanalyses. Phases observed are in agreement with equilibrium pha...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1991-03, Vol.134, p.1283-1287
Main Authors: Pelletier, J.M., Renaud, L., Fouquet, F.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Solidification
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Summary:Surface-treated alloys have been realized on both aluminium-based and iron-based substrates, by laser melting of a nickel predeposited layer. Microstructures have been characterized by optical and scanning electron microscopies and microanalyses. Phases observed are in agreement with equilibrium phase diagrams. The microstructures are mainly dendritic and various phases have been identified. A major difference exists between the two kinds of alloys: a plane front growth occurred at the beginning of the solidification process (interface between the substrate and the melted zone) in iron-based surface alloys, but not in aluminium-based ones. This difference is explained using the constiutional supercooling criterion.
ISSN:0921-5093
1873-4936
DOI:10.1016/0921-5093(91)90974-R