Macro-Micro Modeling and Simulation of Solidification Kinetics of Pb-Sn Alloys

2006 ◽  
Vol 509 ◽  
pp. 171-176
Author(s):  
L. López ◽  
H. Cruz ◽  
B. Campillo ◽  
Carlos González-Rivera
Keyword(s):  
Heat Transfer ◽  
Solidification Rate ◽  
Primary Phase ◽  
Experimental Results ◽  
Eutectic Solidification ◽  
Cooling Curves ◽  
Solidification Kinetics ◽  
Eutectic Morphology ◽  
Micro Modeling ◽  
Kinetics Of

The purpose of this work is to explore the effect of the presence of two different primary phases on the microstructure and solidification kinetics of Pb-Sn alloys. The experimental results have been compared with predictions obtained from the Newton Thermal Analysis of cooling curves generated by a conventional heat transfer-solidification kinetics model. Three Pb-Sn alloys have been considered in this work in order to explore the solidification characteristics of the eutectic in hypoeutectic, hypereutectic and eutectic compositions. Experimental results indicate that the Pb-Sn eutectic morphology and the solidification rate depend on the nature of the pre-existent primary phase during eutectic solidification. From the observed discrepancies between experimental and simulated results it is concluded that further improvements are needed to simulate the solidification kinetics of eutectic microconstituents in the presence of pre-existing primary phases.

Thermal and Kinetic Analysis of the solidification of a near eutectic Al-Cu Alloy

2014 ◽  
Vol 1611 ◽  
pp. 105-110
Author(s):  
M. Morua ◽  
M. Ramirez-Argaez ◽  
C. Gonzalez-Rivera
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Kinetic Analysis ◽  
Eutectic Growth ◽  
Eutectic Solidification ◽  
Cooling Curves ◽  
Transfer Coefficients ◽  
Fourier Thermal Analysis ◽  
Cu Alloy ◽  
Solidification Kinetics

ABSTRACTIn this work the thermal and kinetic analysis of the cooling and solidification of a near eutectic Al-Cu alloy is performed using inverse thermal and solidification kinetics analysis. The Fourier thermal analysis is applied to experimental cooling curves to obtain data on solid fraction evolution and latent heat of solidification. Inverse thermal analysis is applied to calculate the global heat transfer coefficients that allow correct simulation of the cooling of experimental probes. The free growth method is used to obtain the eutectic growth coefficients. All the obtained parameters are feed into a heat transfer-solidification kinetics model to validate the methodology and results generated from this work. It is found a relatively good agreement between experimental and predicted cooling curves which suggest that this methodology could be used to generate useful information needed to simulate eutectic solidification.

On the characterization of eutectic grain growth during solidification

2012 ◽  
Vol 1485 ◽  
pp. 161-166
Author(s):  
M. Morua ◽  
M. Ramirez-Argaez ◽  
C. Gonzalez-Rivera
Keyword(s):  
Heat Transfer ◽  
Cast Iron ◽  
Kinetic Parameters ◽  
Grain Growth ◽  
Eutectic Solidification ◽  
Cooling Curves ◽  
Density Data ◽  
Solidification Kinetics ◽  
Grain Growth Kinetics

ABSTRACTThe purpose of this work is to compare the results obtained from three methodologies intended to estimate kinetic parameters describing quantitatively the grain growth during equiaxed eutectic solidification in order to identify the best procedure to characterize grain growth kinetics. A heat transfer / solidification kinetics model is implemented to simulate the cooling and solidification of eutectic Al-Si and eutectic cast iron in sand molds. Using simulated cooling curves and volume grain density data generated by the model, the three methods are applied to obtain their predicted grain growth coefficients. The predicted results are compared with the grain growth coefficients used in the model. The outcome of this work suggests that two of the three methods under study represent the best option to obtain the kinetic parameters of equiaxed growth during eutectic solidification.

Influence of Ti on Graphite Morphological Transition in Flake Graphite Cast Iron

2010 ◽  
Vol 457 ◽  
pp. 25-30 ◽  
Author(s):  
Hideo Nakae ◽  
Kyohei Fujimoto
Keyword(s):  
Cast Iron ◽  
Volume Fraction ◽  
Solidification Rate ◽  
Eutectic Solidification ◽  
Morphological Transition ◽  
Cooling Curves ◽  
Shell Mold ◽  
Solidification Mode ◽  
Volume Fractions ◽  
Ti Addition

The morphological transition from the A-type to D-type graphite (undercooled graphite) in cast iron has been studied using Fe-3.5%C-2.0%Si-0/0.1%Ti samples. The samples were prepared using a high frequency induction furnace flowing Ar atmosphere using 0.25% steel rods with or without Ti addition. The samples had Ti contents that ranged from 0 to 0.10% at 5 different levels by the addition of sponge titanium. The cooling curves of these melts were measured in a shell mold with an inside diameter of 30mm and 50mm height and in four BN-coated steel cup molds with a volume of 30ml each. The cooling curves were measured by CA thermocouples located at the center. The cooling curves were differentiated to determine the transition points, namely the onset and end points of the eutectic solidification. Three out of the four samples, solidifying in steel molds, were quenched during the eutectic solidification and their macro-structures and micro-structures were observed for the determining the solidification mode. The volume fractions of the D-type graphite area in the samples were measured using 30 microscope images of 50× magnification, and their eutectic temperature was also determined using their cooling curves. The volume fraction of the shell mold samples increased with the Ti addition from 5% to 55%, and if the Ti content was greater than 0.05%, the acceleration occurred with their maximum undercooling, ΔTMAX. The critical undercooling temperature, TA/D, and the critical solidification rate, RA/D, of the A-type to D-type graphite transition were determined by comparing the volume fractions to the solidification time. The ΔTMAX　and TA/D values increased with the Ti addition. This is the main reason why the Ti addition accelerates the D-type graphite increase.

The Effect of Heat Transfer on Local Solidification Kinetics of Eutectic Al-Si Cast Alloy

1999 ◽  
Vol 8 (1) ◽  
pp. 103-110 ◽  
Author(s):  
C. González-Rivera ◽  
H. Cruz M ◽  
A. García H ◽  
J.A. Juarez-Islas
Keyword(s):  
Heat Transfer ◽  
Cast Alloy ◽  
Solidification Kinetics ◽  
Kinetics Of

Effect of Latent Heat Related to Solidification Kinetics on Heat Transfer during Solidification of Al Alloy

2014 ◽  
Vol 884-885 ◽  
pp. 273-276
Author(s):  
Seok Jae Lee
Keyword(s):  
Heat Transfer ◽  
Latent Heat ◽  
Temperature Compensation ◽  
Solid Phase ◽  
A356 Alloy ◽  
Cooling Curve ◽  
Al Alloy ◽  
Cooling Curves ◽  
Solidification Kinetics ◽  
Heat Transfer Simulation

The effect of the latent heat related to the rate of the solidification kinetics during solidification was investigated by using the heat transfer simulation. The latent heat was generated proportional to the amount of the fraction of transformed solid phase and directly affected the temperature compensation during solidification. The importance of the solidification kinetics was discussed by comparing cooling curves calculated using different solidification kinetics with experimentally measured cooling curve of A356 alloy.

Differential Scanning Calorimetry Studies on Ni-Ni3B Alloys

2015 ◽  
Vol 817 ◽  
pp. 556-559
Author(s):  
Jun Feng Xu ◽  
Feng Liu ◽  
Man Zhu ◽  
Zeng Yun Jian
Keyword(s):  
Differential Scanning Calorimetry ◽  
Primary Phase ◽  
Experimental Results ◽  
Small Samples ◽  
Cooling Curves ◽  
Scanning Calorimetry ◽  
Three Phases

Solidification behaviors of hypoeutectic Ni-3.3wt% B and hypereutectic Ni-4.5wt% B alloys were investigated by using differential scanning calorimetry (DSC) technology. Experimental results showed that the solidification behaviors are similar for the two kinds of alloys with small sizes, i.e. three transformed peaks (corresponding to L→α-Ni, L→Ni-Ni23B6and Ni23B6→Ni+Ni3B, respectively) appear in the cooling curves, and three phases (primary phase α-Ni, rod eutectic and dot precipitates) appear in the microstructures, which are different from that of the alloys with large sizes. It can be attributed to the fact that the nucleation of α-Ni and Ni23B6phases are easier than that of Ni3B phase for small samples of hypoeutectic and hypereutectic Ni-Ni3B alloys.

scholarly journals Análisis de la solidificación de aleaciones ZN-AL a partir del método de Newton

2019 ◽  
pp. 1-7
Author(s):  
Sara Cruz-Guerrero ◽  
Israel Lazaro-Becerril ◽  
Jorge Eduardo Munguia-Huerta ◽  
Antonio Juanico-Loran ◽  
Hector Cruz-Mejia
Keyword(s):  
Stainless Steel ◽  
Primary Phase ◽  
Al Alloys ◽  
Cooling Curves ◽  
Lamellar Eutectic ◽  
Type K ◽  
Electronic File ◽  
Stainless Steel 304 ◽  
Eutectic Morphology ◽  
A Minor

The undercoolings of the primary and eutectic phases were determined in three Zn-Al alloys by the experimental cooling curves associated. The compositions of the alloys considered in this study were Zn-3%wAl, Zn-6%w Al and Zn-11% w Al in order to determinate the influence of the primary phase in the morphology obtained by the euetecic microsconstituent at the end of the solidification and its relationship with the underccoling registered in each step. The experimental cooling curves were obtained by a thermocouple type K inserted laterally at the center of a metallic mould of stainless steel 304, which dimentions were 4 cm of diameter and 7.5 cm of lengh. This thermocouple was connected to a data adqusiitior system and a computer in order to register these data in an electronic file. These data were processed following the algorithm of NTA method. The results obtained showed that a minor undercoolig is associated with a lamellar eutectic morphology.

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