Abstract: ABSTRACT The effect of supercooling on the solidification microstructure and solute distribution in Fe-Ni alloys containing 7, 10, 15, 35, and 45 wt.% Ni were investigated. A levitation technique was used to melt and supercool the alloys up to 320 K. X-ray microanalysis and optical techniques were used to determine the fraction of partitioniess solidification as a function of supercooling and alloy composition. It was found that supercooling the alloys below the γ-To curve, but above the metastable extension of the δ-To curve, results in partitioniess solidification of γ in the form of solute-rich crosses at the dendrite cores. On the other hand, when the supercooling was below the metastable δ-To extension, the crosses were not found and a martensitic structure was observed instead of the solute-rich crosses. We attribute this phenomenon to the activation of the alternative δ-Fe phase, instead of γ-Fe, when the supercooling is below the extended δ-To.
Publication Year: 1988
Publication Date: 1988-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 4
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