Determination of the latent heat of fusion and solid fraction evolution of metals and alloys by an improved cooling curve analysis method

2019 ◽  
Vol 140 (4) ◽  
pp. 1825-1836 ◽  
Author(s):  
Carlos González-Rivera ◽  
Anthony Harrup ◽  
Carla Aguilar ◽  
Adrián M. Amaro-Villeda ◽  
Marco A. Ramírez-Argáez
Keyword(s):  
Latent Heat ◽  
Solid Fraction ◽  
Metals And Alloys ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Heat Of Fusion ◽  
Analysis Method ◽  
Latent Heat Of Fusion ◽  
Cooling Curve Analysis

scholarly journals Cooling Curve Analysis Method using a Simplified Energy Balance

2018 ◽  
Vol 3 (1) ◽  
pp. 383
Author(s):  
C. González Rivera ◽  
A. Amaro Villeda ◽  
M. Ramírez Argáez
Keyword(s):  
Energy Balance ◽  
Latent Heat ◽  
Curve Analysis ◽  
Phase Changes ◽  
Cooling Curve ◽  
Analysis Method ◽  
Cooling Process ◽  
Solidification Kinetics ◽  
Cooling Curve Analysis ◽  
Metallic Sample

In this work is described a new cooling curve analysis method focused on the experimental determination of the latent heat of phase changes and phase transformation kinetics.The method analyses the cooling process of a metallic sample, initially liquid that is contained into a cylindrical metallic mold, both of known weight, thermally isolated at its top and bottom. The method is based on a simplified energy balance associated with the experimental measurement of the temperature change of the sample during its cooling process. The method was applied experimentally to zinc and tin of commercial purity, initially liquids and contained into stainless steel molds in order to determine its ability to determine the latent heat of solidification. In order to validate the method, the obtained values of latent heat were compared with the values reported in thermochemical databases. The obtained results suggest that this method can be used to characterize the solidification of metals..Keywords: Solidification, Kinetics; Cooling curve analysis.

Assessment of Latent Heat and Solid Fraction of Al-22Si Alloy Using Newtonian and Fourier Analysis Techniques

2015 ◽  
Vol 830-831 ◽  
pp. 321-324 ◽  
Author(s):  
Vijeesh Vijayan ◽  
K.N. Prabhu
Keyword(s):  
Fourier Analysis ◽  
Latent Heat ◽  
Solid Fraction ◽  
Solidification Process ◽  
Cooling Curve ◽  
Base Line ◽  
Analysis Techniques ◽  
Cooling Curve Analysis ◽  
Temperature Time

Computer aided cooling curve analysis (CACCA) is an online prediction tool for the determination of solidification characteristics of metals or alloys. The results of CACCA can be used to accurately determine latent heat and solid fraction needed for modeling of the solidification process. Newtonian and Fourier analysis techniques adopt a data base line fitting technique to the first derivative curve for calculation of the solid fraction and latent heat of solidification. This paper describes the theoretical and experimental procedures involved Newtonian and Fourier analysis techniques with reference to an Al-22% Si alloy. The correlations between the solid fraction and temperature/time for the alloy were determined.

scholarly journals Comparison of Newtonian and Fourier thermal analysis techniques for calculation of latent heat and solid fraction of aluminum alloys

10.30544/379 ◽  
2004 ◽  
Vol 10 (2) ◽  
pp. 91-106 ◽  
Author(s):  
DARYOUSH EMADI ◽  
LAURENCE V. WHITING ◽  
MILE DJURDJEVIC ◽  
WITOLD T. KIERKUS ◽  
JERRY SOKOLOWSKI
Keyword(s):  
Latent Heat ◽  
Solid Fraction ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Fourier Thermal Analysis ◽  
Liquid Phases ◽  
Cooling Curve Analysis ◽  
Curve Determination ◽  
Casting Industry ◽  
Thermal Analysis Techniques

The cooling curve analysis (CCA) has been used extensively in the metal casting industry, usually to predict alloy compositio n and microstructure constituents. The use of CCA can be expanded to other areas of solidification if the zero curves can be properly calculated. In this paper the Newtonian and Fourier techniques of zero curve determination are described. These techniques were developed to calculate latent heat and to determine the correlations between solid fraction and temperature/time for Al-7 wt%Si alloy. The importance of the changes in heat capacity and density of solid and liquid phases during solidification on the latent heat calculations was examined. The latent heat calculated by Computer-Aided Cooling Curve Analysis (CA-CCA) method is compared with those reported in the literature. The effect of experimental procedure and type of sampling cup on the latent heat calculations were studied for both techniques.

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