S. H. Razavi, Sh. Mirdamadi
A mathematical model was developed to investigate the influence of rapid induction heating on the nucleation and growth of secondary phases in diffusion-controlled processes. The study derived the total stress from the electromagnetic field affecting a specimen's volume and integrated it into the equations governing nucleation and growth phenomena. Additionally, an experimental investigation was conducted on the age hardening treatment of the nickel-based superalloy IN738LC, comparing two rapid aging methods—induction aging and salt bath aging—under equivalent heating rates. The microstructural characteristics of the c9 precipitates and their hardening behavior were analyzed using scanning electron microscopy (SEM), electron image analysis, transmission electron microscopy (TEM), and hardness testing. The findings indicated that despite equal heating rates, the nucleation and growth rates of c9 precipitates in induction aging were significantly faster than those in salt bath aging, particularly in the initial stages. Furthermore, the c9 precipitates formed during induction aging exhibited more advantageous characteristics compared to those produced through salt bath or normal aging. Notably, the growth kinetics of c9 under induction aging diverged from the traditional t1/3 growth law as described by the modified Lifshitz, Slyozov, and Wagner theory, attributed to the external electromagnetic force's influence resulting from rapid induction heating.
@article{1cd42305-11d6-4d02-a3e6-1899c3e06997,
title={Mathematical model of influence of rapid induction heating on nucleation and growth of precipitates},
author={S. H. Razavi and Sh. Mirdamadi},
year={2001},
language={en}
}TY - JOUR TI - Mathematical model of influence of rapid induction heating on nucleation and growth of precipitates AU - S. H. Razavi AU - Sh. Mirdamadi PY - 2001 LA - en ER -
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