A Novel Method to Predict Phase Fraction Based on the Solidification Time on the Cooling Curve
The phase fraction plays a critical role in determining the solidification characteristics of metallic alloys. In this study, we propose a novel method (<i>f</i><sub>s</sub> = (<i>t</i> − <i>t</i><sub>l</sub>)/(<i>t</i><sub&g...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/6/652 |
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| Summary: | The phase fraction plays a critical role in determining the solidification characteristics of metallic alloys. In this study, we propose a novel method (<i>f</i><sub>s</sub> = (<i>t</i> − <i>t</i><sub>l</sub>)/(<i>t</i><sub>s</sub> − <i>t</i><sub>l</sub>)) for estimating the phase fraction based on the solidification time in cooling curves. This method was validated through an experimental analysis of Al-18 wt%Cu and Fe<sub>42</sub>Ni<sub>42</sub>B<sub>16</sub> alloys, where the phase fractions derived from cooling curves were compared with quantitative microstructure evaluations using computer-aided image analysis and the box-counting method. Then, a comparison between the analysis using the present novel method and Newtonian thermal analysis demonstrates good agreement between the results. The present method is easier to operate, since it does not need derivative and integral operations as in Newtonian thermal analysis. In addition, based on the characteristics of the cooling curve, we also found two other relationships—<i>V</i>/<i>R<sub>c</sub></i> = <i>D</i>/Δ<i>T<sub>c</sub></i> and <i>R</i>Δ<i>t</i> = constant, where <i>V</i> is the solidification rate, <i>R</i><sub>c</sub> is the recalescence rate, <i>D</i> is the diameter of the focal area of the pyrometer, Δ<i>T<sub>c</sub></i> is the recalescence height, <i>R</i> is the cooling rate, and Δ<i>t</i> is the solidification plateau time. These findings establish an operational framework for quantifying phase fractions and solidification rates in rapid solidification. |
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| ISSN: | 2075-4701 |