The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform
J H Sokolowski - One of the best experts on this subject based on the ideXlab platform.
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the effect of average cooling rates on the microstructure of the al 20 si high pressure die casting alloy used for monolithic Cylinder Blocks
Journal of Materials Processing Technology, 2008Co-Authors: H Yamagata, H Kurita, M Aniolek, W Kasprzak, J H SokolowskiAbstract:Abstract The effect of average cooling rates on the microstructure of the hypereutectic Al–20% Si alloy was investigated using the novel Universal Metallurgical Simulator and Analyzer Platform. The quantitative measurements of the primary Si size and the Secondary Dendrite Arm Spacing of the non-equilibrium α-aluminum as a function of the cooling rates was performed for the laboratory test samples. This research was carried out in order to analyze the microstructure of the high pressure die cast Cylinder block and to understand its complex solidification process. The Equivalent Diameter of the primary Si decreased from 89.7 ± 17.3 to 16.5 ± 3.8 μm and the Secondary Dendrite Arm Spacing from 22.1 ± 5.9 to 5.1 ± 0.8 μm with an increase in the cooling rate from 4.9 to 82.9 °C/s. Observations of the Cylinder block microstructures revealed that the primary Si size was nearly identical at the subsurface and the centre locations of the bore wall. The Secondary Dendrite Arm Spacing of the non-equilibrium α-aluminum phase as well as the eutectic Si size was significantly smaller at the subsurface of the bore wall. Based on the UMSA laboratory measurements it was determined that the primary Si in the engine bore wall (both at the subsurface and the centre) nucleated as a first phase from the liquid melt at a cooling rate of approximately 72–74 °C/s. It was found that the non-equilibrium α-aluminum dendrites at the engine bore wall subsurface nucleated from the semi-solid melt at a cooling rate of approximately 85 °C/s, while at the centre of the bore wall at approximately 49 °C/s. Research revealed that some primary Si particles nucleated from the beginning of the melt pouring into the shot sleeve prior to the injection process while the α-aluminum dendrites and eutectic Si nucleated in the die cavity. Therefore, it was proven that the injected hypereutectic Al–20% Si liquid melt had solid primary Si particles.
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thermal and metallographic characteristics of the al 20 si high pressure die casting alloy for monolithic Cylinder Blocks
Journal of Materials Processing Technology, 2008Co-Authors: H Yamagata, H Kurita, M Aniolek, W Kasprzak, J H SokolowskiAbstract:Abstract Thermal analysis data were gathered to control the hypereutectic microstructure of the die-cast Al–20% Si Cylinder block at a cooling rate of 1 °C/s. The liquidus temperature was approximately 691 ± 2.2 °C, the nucleation temperature of the Al–Si eutectic was approximately 567.1 ± 1.9 °C and the nucleation temperature of the Cu- and Mg-enriched eutectic was approximately 513.6 ± 1.4 °C. The fraction solid increases linearly from 0 to 21.6% when the temperature decreases from 691 to 567.1 °C. During the Al–Si eutectic growth the fraction solid rose to approximately 70% within a very narrow temperature range of 14 °C. The solidus temperature was recorded to be 479.9 ± 3.3 °C. The total solidification range for the investigated alloy was approximately 211 °C. The rapid quenching experiments during the alloy melting cycle revealed the dissolution of the primary Si particles with the increasing temperature followed by complete melting when the liquidus temperature were exceeded (i.e., 710.9 °C). It was found that a minimum superheat temperature of 80 °C was needed to achieve the adequate refinement of the primary Si particles as a combined effect of thermal and chemical modification. The results provided an extensive understanding of the thermal characteristics for the newly developed hypereutectic Al–20% Si alloy and might be used to optimize the liquid metal handling on the foundry floor with respect to obtaining the required alloy microstructural and service characteristics.
H Yamagata - One of the best experts on this subject based on the ideXlab platform.
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the effect of average cooling rates on the microstructure of the al 20 si high pressure die casting alloy used for monolithic Cylinder Blocks
Journal of Materials Processing Technology, 2008Co-Authors: H Yamagata, H Kurita, M Aniolek, W Kasprzak, J H SokolowskiAbstract:Abstract The effect of average cooling rates on the microstructure of the hypereutectic Al–20% Si alloy was investigated using the novel Universal Metallurgical Simulator and Analyzer Platform. The quantitative measurements of the primary Si size and the Secondary Dendrite Arm Spacing of the non-equilibrium α-aluminum as a function of the cooling rates was performed for the laboratory test samples. This research was carried out in order to analyze the microstructure of the high pressure die cast Cylinder block and to understand its complex solidification process. The Equivalent Diameter of the primary Si decreased from 89.7 ± 17.3 to 16.5 ± 3.8 μm and the Secondary Dendrite Arm Spacing from 22.1 ± 5.9 to 5.1 ± 0.8 μm with an increase in the cooling rate from 4.9 to 82.9 °C/s. Observations of the Cylinder block microstructures revealed that the primary Si size was nearly identical at the subsurface and the centre locations of the bore wall. The Secondary Dendrite Arm Spacing of the non-equilibrium α-aluminum phase as well as the eutectic Si size was significantly smaller at the subsurface of the bore wall. Based on the UMSA laboratory measurements it was determined that the primary Si in the engine bore wall (both at the subsurface and the centre) nucleated as a first phase from the liquid melt at a cooling rate of approximately 72–74 °C/s. It was found that the non-equilibrium α-aluminum dendrites at the engine bore wall subsurface nucleated from the semi-solid melt at a cooling rate of approximately 85 °C/s, while at the centre of the bore wall at approximately 49 °C/s. Research revealed that some primary Si particles nucleated from the beginning of the melt pouring into the shot sleeve prior to the injection process while the α-aluminum dendrites and eutectic Si nucleated in the die cavity. Therefore, it was proven that the injected hypereutectic Al–20% Si liquid melt had solid primary Si particles.
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thermal and metallographic characteristics of the al 20 si high pressure die casting alloy for monolithic Cylinder Blocks
Journal of Materials Processing Technology, 2008Co-Authors: H Yamagata, H Kurita, M Aniolek, W Kasprzak, J H SokolowskiAbstract:Abstract Thermal analysis data were gathered to control the hypereutectic microstructure of the die-cast Al–20% Si Cylinder block at a cooling rate of 1 °C/s. The liquidus temperature was approximately 691 ± 2.2 °C, the nucleation temperature of the Al–Si eutectic was approximately 567.1 ± 1.9 °C and the nucleation temperature of the Cu- and Mg-enriched eutectic was approximately 513.6 ± 1.4 °C. The fraction solid increases linearly from 0 to 21.6% when the temperature decreases from 691 to 567.1 °C. During the Al–Si eutectic growth the fraction solid rose to approximately 70% within a very narrow temperature range of 14 °C. The solidus temperature was recorded to be 479.9 ± 3.3 °C. The total solidification range for the investigated alloy was approximately 211 °C. The rapid quenching experiments during the alloy melting cycle revealed the dissolution of the primary Si particles with the increasing temperature followed by complete melting when the liquidus temperature were exceeded (i.e., 710.9 °C). It was found that a minimum superheat temperature of 80 °C was needed to achieve the adequate refinement of the primary Si particles as a combined effect of thermal and chemical modification. The results provided an extensive understanding of the thermal characteristics for the newly developed hypereutectic Al–20% Si alloy and might be used to optimize the liquid metal handling on the foundry floor with respect to obtaining the required alloy microstructural and service characteristics.
I Puertas - One of the best experts on this subject based on the ideXlab platform.
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analysis of the influence of chemical composition on the mechanical and metallurgical properties of engine Cylinder Blocks in grey cast iron
Journal of Materials Processing Technology, 2004Co-Authors: L Alvarez, C J Luis, I PuertasAbstract:Abstract Within automotive components, grey cast iron continues to occupy a notable place in the area of materials. Cast iron is in direct competition with cast aluminium, although the mechanical properties of the former find their place in the market in making certain components such as Cylinder Blocks, and to a lesser extent, Cylinder heads. One of the main difficulties of obtaining cast iron lies in the variability within the material of the same chemical composition. This reflects that the cast iron manufacturing process, although it has evolved enormously, and the processes are easily controlled and reproducible, is always subject to small changes, which can provoke variations in the mechanical properties of the cast material. This study analyses how the chemical composition influences the mechanical properties of grey cast iron. The rest of the influential factors, characteristic of grey cast iron, remain constant, which means that the cooling speed does not vary in the process and is an inherent value of the moulding installation in which the workpieces will be cast. Also, the inoculation is carried out in the same way in all the samples cast, in such a way that it is not considered a variable.
R B Bhat - One of the best experts on this subject based on the ideXlab platform.
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modeling of swash plate axial piston pumps with conical Cylinder Blocks
Journal of Mechanical Design, 2004Co-Authors: M Bahr K Khalil, J Svoboda, R B BhatAbstract:Electrically controlled swash plate axial piston pumps with conical Cylinder Blocks are recently used in the industry in view of their superior performance. Several studies have been carried out to study the characteristics of such novel pump mechanism. In these studies, partial mathematical modeling is conducted relevant to the points discussed. In the present study, a comprehensive pump mathematical model is developed and experimentally validated. The model could be used as a design tool in order to fully exploit the advantages of the new design.
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experimental investigation on swash plate axial piston pumps with conical Cylinder Blocks using fuzzy logic control
ASME 2002 International Mechanical Engineering Congress and Exposition, 2002Co-Authors: M Bahr K Khalil, J Svoboda, R B BhatAbstract:Analytical studies on the dynamic performance of variable displacement swash plate axial piston pumps show that the pump performance can significantly improved by replacing the conventional PD process controller with fuzzy logic controller. Electrically controlled, constant power regulated, swash plate pumps with conical Cylinder Blocks have been recently extensively studied. Comparative study has been carried out to compare the pump dynamic performance when the conventional PD process controller is replaced by a proposed fuzzy logic one. The study reveals some superior performance characteristics when fuzzy logic controller is used. In the present study an experimental setup is built to measure the dynamic performance of a typical 9-piston pump that has conical shaped Cylinder block. The pump is of 40 cc/rev geometrical size, type A4VSO, that is manufactured by Rexroth. The experimental setup consists of a hydraulic test bed interfaced with real time control and data acquisition system. The setup is used firstly for testing the pump static characteristics. Subsequently, the setup is used to measure the time response of the pump, which is equipped with the conventional PD controller, to the stepwise changes in the load pressure. Pump model verification is then discussed based on the comparison between the theoretical and experimental results. The pump is afterwards interfaced with real time control software for prototyping the proposed fuzzy logic controller that replaces the currently used PD one. With the fuzzy logic control, measuring the pump time response under the same loading conditions is repeated. Experimental results are presented, compared with the analytical findings and discussed.Copyright © 2002 by ASME
W Kasprzak - One of the best experts on this subject based on the ideXlab platform.
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the effect of average cooling rates on the microstructure of the al 20 si high pressure die casting alloy used for monolithic Cylinder Blocks
Journal of Materials Processing Technology, 2008Co-Authors: H Yamagata, H Kurita, M Aniolek, W Kasprzak, J H SokolowskiAbstract:Abstract The effect of average cooling rates on the microstructure of the hypereutectic Al–20% Si alloy was investigated using the novel Universal Metallurgical Simulator and Analyzer Platform. The quantitative measurements of the primary Si size and the Secondary Dendrite Arm Spacing of the non-equilibrium α-aluminum as a function of the cooling rates was performed for the laboratory test samples. This research was carried out in order to analyze the microstructure of the high pressure die cast Cylinder block and to understand its complex solidification process. The Equivalent Diameter of the primary Si decreased from 89.7 ± 17.3 to 16.5 ± 3.8 μm and the Secondary Dendrite Arm Spacing from 22.1 ± 5.9 to 5.1 ± 0.8 μm with an increase in the cooling rate from 4.9 to 82.9 °C/s. Observations of the Cylinder block microstructures revealed that the primary Si size was nearly identical at the subsurface and the centre locations of the bore wall. The Secondary Dendrite Arm Spacing of the non-equilibrium α-aluminum phase as well as the eutectic Si size was significantly smaller at the subsurface of the bore wall. Based on the UMSA laboratory measurements it was determined that the primary Si in the engine bore wall (both at the subsurface and the centre) nucleated as a first phase from the liquid melt at a cooling rate of approximately 72–74 °C/s. It was found that the non-equilibrium α-aluminum dendrites at the engine bore wall subsurface nucleated from the semi-solid melt at a cooling rate of approximately 85 °C/s, while at the centre of the bore wall at approximately 49 °C/s. Research revealed that some primary Si particles nucleated from the beginning of the melt pouring into the shot sleeve prior to the injection process while the α-aluminum dendrites and eutectic Si nucleated in the die cavity. Therefore, it was proven that the injected hypereutectic Al–20% Si liquid melt had solid primary Si particles.
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thermal and metallographic characteristics of the al 20 si high pressure die casting alloy for monolithic Cylinder Blocks
Journal of Materials Processing Technology, 2008Co-Authors: H Yamagata, H Kurita, M Aniolek, W Kasprzak, J H SokolowskiAbstract:Abstract Thermal analysis data were gathered to control the hypereutectic microstructure of the die-cast Al–20% Si Cylinder block at a cooling rate of 1 °C/s. The liquidus temperature was approximately 691 ± 2.2 °C, the nucleation temperature of the Al–Si eutectic was approximately 567.1 ± 1.9 °C and the nucleation temperature of the Cu- and Mg-enriched eutectic was approximately 513.6 ± 1.4 °C. The fraction solid increases linearly from 0 to 21.6% when the temperature decreases from 691 to 567.1 °C. During the Al–Si eutectic growth the fraction solid rose to approximately 70% within a very narrow temperature range of 14 °C. The solidus temperature was recorded to be 479.9 ± 3.3 °C. The total solidification range for the investigated alloy was approximately 211 °C. The rapid quenching experiments during the alloy melting cycle revealed the dissolution of the primary Si particles with the increasing temperature followed by complete melting when the liquidus temperature were exceeded (i.e., 710.9 °C). It was found that a minimum superheat temperature of 80 °C was needed to achieve the adequate refinement of the primary Si particles as a combined effect of thermal and chemical modification. The results provided an extensive understanding of the thermal characteristics for the newly developed hypereutectic Al–20% Si alloy and might be used to optimize the liquid metal handling on the foundry floor with respect to obtaining the required alloy microstructural and service characteristics.
