Abstract
How the solid fraction fS increases with decreasing temperature T during solidification, i.e., the fS(T) of an alloy, can play a critical role in its susceptibility to cracking during solidification as demonstrated by various models of solidification cracking. In the present study the classic analytical modeling of microsegregation during rapid solidification was used to calculate fS(T) using Al–Cu alloys as an example. The present study showed significant undercooling can occur during fast cooling and affect fS(T) significantly. For the purpose of illustration, |dT/d(fS)1/2| near (fS)1/2 = 1 was used in the present study as a simple index for the susceptibility to solidification cracking. The fS(T) calculated by any solidification model (e.g., the present analytical model or a phase-field model with undercooling, or the Scheil–Gulliver model without undercooling) can be used to calculate the curve of T vs (fS)1/2 and hence the index. The present study showed undercooling can increase the index and hence the cracking susceptibility significantly. It can also change the composition most susceptible to solidification cracking.
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Acknowledgments
The study was supported by the National Science Foundation of the United States (Grant No. DMR 1904503). Soumyadeep Dasgupta, formerly Graduate Student at the University of Wisconsin-Madison supervised by Professor Sindo Kou, is now Graduate Student at the University of Michigan-Ann Arbor.
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Dasgupta, S., Kou, S. Undercooling and Cracking During Solidification. Metall Mater Trans A (2024). https://doi.org/10.1007/s11661-024-07486-6
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DOI: https://doi.org/10.1007/s11661-024-07486-6