Cooling Rate Modeling and Evaluation during Centrifugal Atomization Process

Centrifugal atomization is a rapid solidification technique involving fast cooling rates to produce high-quality powders. The final microstructure of the atomized particles closely linked with thermal history and experienced during process. However, there insufficient research on temperature evolution metal produced by this technique, most works evaluate droplet through semi-empirical correlations that lie outside conditions where they were derived. In work, rate centrifugally Al-4%Cu was studied via mathematical modelling experimental validation. A heat transfer model implemented, value convective coefficient obtained from Whitaker correlation considering three cases study for thermophysical properties gas. validity experimentally evaluated means based Secondary Dendrite Arm Spacing (SDAS) technique. Reynolds Prandtl numbers at ambient gas conductivity film gave best agreement results, in order 105 Ks−1 <32.5 µm powders He atmosphere.