Abstract
Differential scanning calorimetry (DSC) measurements are used to estimate the fractional latent heat release during phase changes. There are temperature lags inherent to the instruments due to the temperature measurement at a di.erent location than that of the sample and reference materials. Recently, Dong and Hunt[1] showed that signi.cant improvement in estimating the fractional latent heat can be obtained when detailed simulations of the heat transfer within the instrument are performed. The Netzsch DSC 404C instrument, with a high accuracy heat capacity sensor, is considered in this study. This instrument had a di.erent con.guration than that studied by Dong and Hunt. The applicability of Dong and Hunt's approach to this instrument is investigated. It was found that the DSC instrument could be described by numerous parameters but that model parameters were difficult to estimate. Numerical simulation results are presented and compared with experimental results for the fractional latent heat of a commercial A356 aluminum alloy. Once the thermal lag was signi.cantly reduced, the onset temperature of the eutectic phase transformation was in excellent agreement with previously reported values. The use of this new fractional latent heat data allowed accurate predictions of the cooling curves during casting solidification.
| Original language | English |
|---|---|
| Pages (from-to) | 1546-1554 |
| Number of pages | 9 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 38 A |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2007 |