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1
Content available Preparation and Microstructure Evolution of Continuous Unidirectional Solidification Tin Bronze Alloy at Different Continuous Casting Speed
Luo Jihui
Archives of Foundry Engineering
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2020
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Vol. 20, iss. 2
118--122
EN
The mold temperature of the downward continuous unidirectional solidification (CUS) cannot be controlled higher than the liquidus of alloys to be cast. Therefore, the continuous casting speed becomes the main parameter for controlling the growth of columnar crystal structure of the alloy. In this paper, the tin bronze alloy was prepared by the downward CUS process. The microstructure evolution of the CUS tin bronze alloy at different continuous casting speeds was analysed. In order to further explain the columnar crystal evolution, a relation between the growth rate of columnar crystal and the continuous casting speed during the CUS process was built. The results show that the CUS tin bronze alloy mainly consists of columnar crystals and equiaxed crystals when the casting speed is low. As the continuous casting speed increases, the equiaxed crystals begin to disappear. The diameter of the columnar crystal increases with the continuous casting speed increasing and the number of columnar crystal decreases. The growth rate of columnar crystal increases with increasing of the continuous casting speed during CUS tin bronze alloy process.
2
Content available Effect of Process Parameters on Exudation Thickness in Continuous Unidirectional Solidification Tin Bronze Alloy
Jihui Luo, Fang He
Archives of Foundry Engineering
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2019
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iss. 2
97--100
EN
The exudation layer seriously affects the properties and the surface finish of the tin bronze alloy. The effective control of the exudation thickness is important measure for improving the properties of the alloy. In order to study the influence of process parameters on the thickness of exudate layer, the tin bronze alloy was prepared by continuous unidirectional solidification technology at different process parameters. The microstructure of the continuous unidirectional solidification tin bronze alloy was analyzed. The effect of process parameters on microstructure and chemical compositions was studied by orthogonal experiment. The results show that there exists an exudation layer on the surface of the continuous unidirectional solidification tin bronze alloy, and the exudation is mainly composed of a tin-rich precipitated phase. It indicates that the continuous casting speed is the main factor affecting the thickness of exudation layer, followed by mold temperature, melt temperature, cooling water temperature and cooling distance.
3
Content available Mechanical Properties of Magnesium Alloys Produced by the Heated Mold Continuous Casting Process
Okayasu M., Wu S., Tanimoto T., Takeuchi S.
Archives of Foundry Engineering
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2016
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Vol. 16, iss. 4
208--216
EN
Investigation of the tensile and fatigue properties of cast magnesium alloys, created by the heated mold continuous casting process (HMC), was conducted. The mechanical properties of the Mg-HMC alloys were overall higher than those for the Mg alloys, made by the conventional gravity casting process (GC), and especially excellent mechanical properties were obtained for the Mg97Y2Zn1-HMC alloy. This was because of the fine-grained structure composed of the α-Mg phases with the interdendritic LPSO phase. Such mechanical properties were similar levels to those for conventional cast aluminum alloy (Al84.7Si10.5Cu2.5Fe1.3Zn1 alloys: ADC12), made by the GC process. Moreover, the tensile properties (σ and εf) and fatigue properties of the Mg97Y2Zn1-HMC alloy were about 1.5 times higher than that for the commercial Mg90Al9Zn1-GC alloy (AZ91). The high correlation rate between tensile properties and fatigue strength (endurance limit: σl) was obtained. With newly proposed etching technique, the residual stress in the Mg97Y2Zn1 alloy could be revealed, and it appeared that the high internal stress was severely accumulated in and around the long-period stacking-order phases (LPSO). This was made during the solidification process due to the different shrinkage rate between α-Mg and LPSO. In this etching technique, micro-cracks were observed on the sample surface, and amount of micro-cracks (density) could be a parameter to determine the severity of the internal stress, i.e., a large amount to micro-cracks is caused by the high internal stress.
4
Content available remote Analiza czynników wpływających na krystalizację eutektyki w stopie AI-Cu-Ag
Nocuń S., Konopka Z., Zyska A., Łągiewka M., Bober A.
Archiwum Odlewnictwa
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2006
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R. 6, nr 22
338-343
PL
Praca przedstawia analizę czynników determinujących rodzaj eutektyki podwójnej AI-Al_{2}Cu w potrójnym stopie AI-Cu-Ag. Czynniki jakie były analizowane to: entropia rozpuszczania faz eutektycznych, ułamek objętościowy danej fazy eutektycznej, prędkość wzrostu i gradient temperatury.
EN
In this paper it was shown the influence of the parameters such as: entropy of fusion, volume fraction, velocity of the unidirectional solidification on the lamellar eutectic obtained during unidirectional solidification. It was shown that all known parameters allow us to classify obtained eutectic into regular lamellar eutectic what was proven during the microscopy observations shown on the figure 1. There is also shown the disturbances occurred during increasing the velocity of the unidirectional solidification - shown on the figure 2. It can be estimated that this disturbances are occurred by evolution of the lamellar structure into the rod eutectic, or even loosing the regularity of the structure.
5
Content available remote Segregacja srebra podczas krystalizacji kierunkowej stopu Al-Ag-Cu
Konopka Z., Nocuń S., Zyska A., Bober A., Cisowska-Łągiewka M.
Archiwum Odlewnictwa
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2005
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R. 5, nr 15
216--221
PL
W pracy przedstawiono segregację srebra występującą podczas krystalizacji kierunkowej potrójnego stopu Al-Ag-Cu, oraz jej wpływ na stabilność frontu krystalizacji podczas krystalizacji kierunkowej. Badania wykazały silną segregację Ag zarówno w fazie α(Al) w stopie, jak i w cieczy przed frontem krystalizacji. Segregacja ta nie wpływa bezpośrednio na parametry struktury, jednakże zauważony został dość silny jej wpływ na stabilność frontu krystalizacji.
EN
In this paper it was shown the segregation of the ternary element Ag which oc-curs during unidirectional solidification of the ternary Al-Ag-Cu system, as well as its influence on the stability of solid-liquid interface. The result confirmed strong segregation of the silver not only in the liquid on the solid-liquid interface but also in the α(Al) phase. This segregation doesn’t have visible influence on the structures parameters but it has been observed the influence of this segregation on the solid-liquid interface.
6
Content available remote Wpływ prędkości krystalizacji kierunkowej na odległość międzypłytkową eutektyki w stopie Al-Ag-Cu
Konopka Z., Nocuń S. N.
Archiwum Odlewnictwa
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2004
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R. 4, nr 14
243-248
PL
W pracy przedstawiono wyniki pomiarów odległości międzypłytkowej [alfa] eutektyki w potrójnym stopie AI-Ag-Cu w zależności od zmiany prędkości wzrostu eutektyki podczas procesu krystalizacji kierunkowej. Dokonane pomiary potwierdzają prawo wzrostu eutektyki regularnej [alfa]^2 x V=const.
EN
In this paper it was shown the measurements results of the spacing between eutectic lamellae [alfa] in the ternary AI-Ag-Cu alloy according to changes of the velocity of the unidirectional solidification. Results show that the eutectic growth law [alfa]^2xV=const. is true.
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