Phase Transformations in Ni-Al-Cr System.

This WWW page illustrates that it is indeed possible to predict the reactions that occur during weld solidification.  Following plots pertains to solidification of Ni-0.20Al-0.05Cr (mole fractions) alloy at two different cooling rates (10 and 100 K/s).  First the variations in phase volume % are shown for two different cooling rates.  Then, the typical composition profiles for aluminum and cromium (mole fractions) are shown. The calculations assumes no diffusion in gamma prime phase. The calculations are done with Dictra software.

Phase fractions at different cooling rates.

  • Variation of phase percentage for a weld cooling rate of 10 K/s and 100 K/s
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    Composition Profiles at different cooling rates:

  • Cooling rate 10 deg c per sec (composition profiles at 0,6,10,20,30,40 seconds)
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  • Cooling rate 100 deg C / s (composition profiles at 0,0.6,1,2,3,4 seconds)
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    Based on the work by Babu, Vitek, and David.