The influence of solid fraction of Al 28Pb alloy mushy on distribution of Pb in Al Pb ingot was studied. The special electromagnetic stirring apparatus was used to prepare Al 28Pb alloy mushy and the relationship betw...The influence of solid fraction of Al 28Pb alloy mushy on distribution of Pb in Al Pb ingot was studied. The special electromagnetic stirring apparatus was used to prepare Al 28Pb alloy mushy and the relationship between solid fraction and stirring temperature was gotten. The results show that when solid fraction of Al 28Pb alloy mushy is less than 45%, Pb precipitation usually happens in the ingot. However, Pb precipitation in casting reduces gradually with increasing solid fraction of mushy, and when solid fraction is larger than 45%, Pb precipitation in casting can be removed. [展开更多
The nonequilibrium diffusion of liquid aluminum atoms in cross direction in the innerpart of the solid steel base has been realized by using methods such as roughening steel plate surface, immersing flux on steel plat...The nonequilibrium diffusion of liquid aluminum atoms in cross direction in the innerpart of the solid steel base has been realized by using methods such as roughening steel plate surface, immersing flux on steel plate surface and short time diffusion, and the interface of solid steel and liquid aluminum under nonequilibrium diffusion in cross direction was formed by using rapid solidification. The interfacial structure was studied by means of electron probe microanalysis. The results showed that the interfacial structure of solid steel and liquid aluminum under nonequilibrium diffusion in cross direction is quite different from that of solid steel and liquid aluminum under conventional diffusion, that is, the interface of solid steel and liquid aluminum under nonequilibrium diffusion in cross direction is made up of groups of Al 13 Fe 4 teeth (which grew from the contact surface to steel base inner) at the bulges of steel plate surface and Fe Al solid solution (whose Al content is less than 3.5%) at the concaves of steel plate surface between the groups of Al 13 Fe 4 teeth.展开更多
The slurry of Al-20Sn alloy was prepared using electromagnetic-mechanical stirring method. The bonding of steel/mushy Al-20Sn was conducted using casting rolling technique. The bonding parameters were 505 ℃ for prehe...The slurry of Al-20Sn alloy was prepared using electromagnetic-mechanical stirring method. The bonding of steel/mushy Al-20Sn was conducted using casting rolling technique. The bonding parameters were 505 ℃ for preheat temperature of steel plate and 10 mm/s for rolling speed. The interfacial mechanical property and structure of steel/mushy Al-20Sn bonding plate were studied. The results show that the relationship between solid fraction of Al-20Sn slurry and interfacial shear strength of bonding plate is S=52.9+0.998φ s-0.014 4φ 2 s (where S is interfacial shear strength, φ s is solid fraction). The largest interfacial shear strength is 70.2 MPa when solid fraction is 34.6%. The interface of bonding plate is made up of Fe-Al compound and Fe-Al solid solution alternatively.展开更多
The bonding of steel and mushy Al 28Pb alloy was studied. The relationship model about preheat temperature of steel plate, solid fraction of mushy Al 28Pb alloy, rolling speed and interfacial shear strength of the bon...The bonding of steel and mushy Al 28Pb alloy was studied. The relationship model about preheat temperature of steel plate, solid fraction of mushy Al 28Pb alloy, rolling speed and interfacial shear strength of the bonding plate was established by artificial neural network perfectly. This model can be optimized by a genetic algorithm, and the optimum bonding parameters for the largest interfacial shear strength are: 546 ℃ for preheat temperature of steel plate, 43.5% for solid fraction of mushy Al 28Pb alloy and 8.6 mm/s for rolling speed, and the corresponding largest interfacial shear strength of bonding plate is 70.3 MPa. [展开更多
The ratio of Fe-Al compound at the bonding interface of solid steel plate to Al-7graphite slurry was used to characterize the interracial structure of steel-Al-7graphite semi-solid bonding plate quantitatively. The re...The ratio of Fe-Al compound at the bonding interface of solid steel plate to Al-7graphite slurry was used to characterize the interracial structure of steel-Al-7graphite semi-solid bonding plate quantitatively. The relationship between the ratio of Fe-Al compound at interface and bonding parameters （such as preheat temperature of steel plate, solid fraction of Al-7graphite slurry and rolling speed） was established by artificial neural networks perfectly. The results show that when the bonding parameters are 516 ℃ for preheat temperature of steel plate, 32.5% for solid fraction of Al-7graphite slurry and 12 mm/s for rolling speed, the reasonable ratio of Fe-Al compound corresponding to the largest interfacial shear strength of bonding plate is obtained to be 70.1%. This reasonable ratio of Fe-Al compound is a quantitative criterion of interracial embrittlement, namely, when the ratio of Fe-Al compound at interface is larger than 70.1%, interfacial embrittlement will occur.展开更多
Artificial neural networks were successfully used to research the modeling of aluminum solid fraction, preheat temperature of steel plate, preheat temperature of dies, free diffusing time before pressing and the inter...Artificial neural networks were successfully used to research the modeling of aluminum solid fraction, preheat temperature of steel plate, preheat temperature of dies, free diffusing time before pressing and the interfacial shear strength in steel mushy aluminum pressing bonding. Further more, the optimum bonding parameters for the largest interfacial shear strength were also optimized with a genetic algorithm.展开更多
The interfacial properties of steel-mushy Al-28Pb bonding plate with different interfacial structures, and the influence of ratio of Fe-Al compound at the interface on interfacial shear strength were investigated. The...The interfacial properties of steel-mushy Al-28Pb bonding plate with different interfacial structures, and the influence of ratio of Fe-Al compound at the interface on interfacial shear strength were investigated. The results show that there is a nonlinear relationship between the ratio of Fe-Al compound at the interface and the interfacial shear strength. When the ratio of Fe-Al compound at the interface is smaller than 71.4%, with the increase of the ratio of Fe-Al compound at the interface, the interfacial shear strength increases gradually; when the ratio of Fe-Al compound at the interface is larger than 71.4%, with the increase of the ratio of Fe-Al compound at the interface, the interfacial shear strength decreases continuously; when the ratio of Fe-Al compound at the interface is 71.4%, the largest interfacial shear strength 70.2MPa is obtained.展开更多
Fe-Al compound at the interface of steel-mushy Al-28Pb bonding plate was studied quantitatively. The relationship between ratio of Fe-Al compound at interface and bonding parameters such as preheating temperature of s...Fe-Al compound at the interface of steel-mushy Al-28Pb bonding plate was studied quantitatively. The relationship between ratio of Fe-Al compound at interface and bonding parameters such as preheating temperature of steel plate, solid volume fraction of Al-28Pb slurry and rolling speed, was established by artificial neural networks perfectly. The results show that when the bonding parameters are 546 ℃ for preheating temperature of steel plate, 43.5% for solid volume fraction of Al-28Pb slurry and 8.6 mm/s for rolling speed, the reasonable ratio of Fe-Al compound corresponding to the largest interfacial shear strength of bonding plate is obtained as 71.5%. This reasonable ratio of Fe-Al compound is a quantitative criterion of interfacial embrittlement, that is, when the ratio of Fe-Al compound at interface is larger than 71.5%, interfacial embrittlement will occur.展开更多
QTi3.5 10graphite(mass fraction, %) slurry was prepared using electromagnetic mechanical stirring technology. The distribution of graphite particles in QTi3.5 10graphite slurry was studied using cold quenching method....QTi3.5 10graphite(mass fraction, %) slurry was prepared using electromagnetic mechanical stirring technology. The distribution of graphite particles in QTi3.5 10graphite slurry was studied using cold quenching method. The results show that solid fraction of QTi3.5 10graphite slurry increases with the decreasing stirring temperature. There is a linear relationship between solid fraction and stirring temperature. With increasing solid fraction, the rising of graphite particles in slurry is restricted gradually. When the solid fraction is larger than 42.5%, the rising of graphite particles in slurry can be controlled, and QTi3.5 10graphite slurry with uniform distribution of graphite particles can be prepared.展开更多
The pressing bonding of steel plate to QTi3.5-3.5graphite slurry was studied. The bonding conditions were 620 ℃ for preheating temperature of steel plate, 530 ℃ for preheating temperature of dies, 50 MPa for pressur...The pressing bonding of steel plate to QTi3.5-3.5graphite slurry was studied. The bonding conditions were 620 ℃ for preheating temperature of steel plate, 530 ℃ for preheating temperature of dies, 50 MPa for pressure and 2 min for pressing time. The relationship between the solid fraction of QTi3.5-3.5graphite slurry and the interfacial mechanical property of bonding plate was obtained. The results show that when the solid fraction of QTi3.5-3.5graphite slurry is smaller than 45.8%, the interfacial shear strength of bonding plate increases with the increasing of solid fraction. When the solid fraction is larger than 45.8%, the interfacial shear strength decreases with the increasing of solid fraction. When the solid fraction is 45.8%, the largest interfacial shear strength of bonding plate 127 MPa can be got, and the interface is made up of Fe-Cu solid solution.展开更多
The bonding of solid steel plate to liquid aluminum was studied by using rapid solidification. The relationship between the bonding parameters such as preheat temperature of steel plate, temperature of aluminum liquid...The bonding of solid steel plate to liquid aluminum was studied by using rapid solidification. The relationship between the bonding parameters such as preheat temperature of steel plate, temperature of aluminum liquid and bonding time, and the interfacial shear strength of bonding plate was established by artificial neural networks perfectly. This relationship was optimized with a genetic algorithm. The optimum bonding parameters are: 226 ℃ for preheat temperature of steel plate, 723 ℃ for temperature of aluminum liquid and 15.8 s for bonding time, and the largest interfacial shear strength of bonding plate is 71.6 MPa.展开更多
The rolling treatment of steel/mushy Al 20Sn bonding plate was conducted under different relative reduction at room temperature. The effect of room temperature rolling on interfacial mechanical property of bonding pla...The rolling treatment of steel/mushy Al 20Sn bonding plate was conducted under different relative reduction at room temperature. The effect of room temperature rolling on interfacial mechanical property of bonding plate was studied. The results show that, for steel/mushy Al 20Sn bonding plate which consists of 1.2mm thick 08Al steel plate and 2.0mm thick Al 20Sn layer, the relationship between interfacial shear strength and relative reduction is S=70.1+5.48r-r 2 (S is interfacial shear strength, r is relative reduction). When the relative reduction is 2.74%, the largest interfacial shear strength 77.6 MPa can be obtained.展开更多
文摘The influence of solid fraction of Al 28Pb alloy mushy on distribution of Pb in Al Pb ingot was studied. The special electromagnetic stirring apparatus was used to prepare Al 28Pb alloy mushy and the relationship between solid fraction and stirring temperature was gotten. The results show that when solid fraction of Al 28Pb alloy mushy is less than 45%, Pb precipitation usually happens in the ingot. However, Pb precipitation in casting reduces gradually with increasing solid fraction of mushy, and when solid fraction is larger than 45%, Pb precipitation in casting can be removed. [
文摘The nonequilibrium diffusion of liquid aluminum atoms in cross direction in the innerpart of the solid steel base has been realized by using methods such as roughening steel plate surface, immersing flux on steel plate surface and short time diffusion, and the interface of solid steel and liquid aluminum under nonequilibrium diffusion in cross direction was formed by using rapid solidification. The interfacial structure was studied by means of electron probe microanalysis. The results showed that the interfacial structure of solid steel and liquid aluminum under nonequilibrium diffusion in cross direction is quite different from that of solid steel and liquid aluminum under conventional diffusion, that is, the interface of solid steel and liquid aluminum under nonequilibrium diffusion in cross direction is made up of groups of Al 13 Fe 4 teeth (which grew from the contact surface to steel base inner) at the bulges of steel plate surface and Fe Al solid solution (whose Al content is less than 3.5%) at the concaves of steel plate surface between the groups of Al 13 Fe 4 teeth.
文摘The slurry of Al-20Sn alloy was prepared using electromagnetic-mechanical stirring method. The bonding of steel/mushy Al-20Sn was conducted using casting rolling technique. The bonding parameters were 505 ℃ for preheat temperature of steel plate and 10 mm/s for rolling speed. The interfacial mechanical property and structure of steel/mushy Al-20Sn bonding plate were studied. The results show that the relationship between solid fraction of Al-20Sn slurry and interfacial shear strength of bonding plate is S=52.9+0.998φ s-0.014 4φ 2 s (where S is interfacial shear strength, φ s is solid fraction). The largest interfacial shear strength is 70.2 MPa when solid fraction is 34.6%. The interface of bonding plate is made up of Fe-Al compound and Fe-Al solid solution alternatively.
文摘The bonding of steel and mushy Al 28Pb alloy was studied. The relationship model about preheat temperature of steel plate, solid fraction of mushy Al 28Pb alloy, rolling speed and interfacial shear strength of the bonding plate was established by artificial neural network perfectly. This model can be optimized by a genetic algorithm, and the optimum bonding parameters for the largest interfacial shear strength are: 546 ℃ for preheat temperature of steel plate, 43.5% for solid fraction of mushy Al 28Pb alloy and 8.6 mm/s for rolling speed, and the corresponding largest interfacial shear strength of bonding plate is 70.3 MPa. [
基金Project(50054) supported by the Program for New Century Excellent Talents in Universityproject(20060004020) supported by the Research Fund for the Doctoral Program of Higher Education+1 种基金project(3062017) supported by the Natural Science Foundation of Beijing, Chinaproject(2004SZ007) supported by the Foundation of Beijing Jiaotong University
文摘The ratio of Fe-Al compound at the bonding interface of solid steel plate to Al-7graphite slurry was used to characterize the interracial structure of steel-Al-7graphite semi-solid bonding plate quantitatively. The relationship between the ratio of Fe-Al compound at interface and bonding parameters （such as preheat temperature of steel plate, solid fraction of Al-7graphite slurry and rolling speed） was established by artificial neural networks perfectly. The results show that when the bonding parameters are 516 ℃ for preheat temperature of steel plate, 32.5% for solid fraction of Al-7graphite slurry and 12 mm/s for rolling speed, the reasonable ratio of Fe-Al compound corresponding to the largest interfacial shear strength of bonding plate is obtained to be 70.1%. This reasonable ratio of Fe-Al compound is a quantitative criterion of interracial embrittlement, namely, when the ratio of Fe-Al compound at interface is larger than 70.1%, interfacial embrittlement will occur.
文摘Artificial neural networks were successfully used to research the modeling of aluminum solid fraction, preheat temperature of steel plate, preheat temperature of dies, free diffusing time before pressing and the interfacial shear strength in steel mushy aluminum pressing bonding. Further more, the optimum bonding parameters for the largest interfacial shear strength were also optimized with a genetic algorithm.
文摘The interfacial properties of steel-mushy Al-28Pb bonding plate with different interfacial structures, and the influence of ratio of Fe-Al compound at the interface on interfacial shear strength were investigated. The results show that there is a nonlinear relationship between the ratio of Fe-Al compound at the interface and the interfacial shear strength. When the ratio of Fe-Al compound at the interface is smaller than 71.4%, with the increase of the ratio of Fe-Al compound at the interface, the interfacial shear strength increases gradually; when the ratio of Fe-Al compound at the interface is larger than 71.4%, with the increase of the ratio of Fe-Al compound at the interface, the interfacial shear strength decreases continuously; when the ratio of Fe-Al compound at the interface is 71.4%, the largest interfacial shear strength 70.2MPa is obtained.
文摘Fe-Al compound at the interface of steel-mushy Al-28Pb bonding plate was studied quantitatively. The relationship between ratio of Fe-Al compound at interface and bonding parameters such as preheating temperature of steel plate, solid volume fraction of Al-28Pb slurry and rolling speed, was established by artificial neural networks perfectly. The results show that when the bonding parameters are 546 ℃ for preheating temperature of steel plate, 43.5% for solid volume fraction of Al-28Pb slurry and 8.6 mm/s for rolling speed, the reasonable ratio of Fe-Al compound corresponding to the largest interfacial shear strength of bonding plate is obtained as 71.5%. This reasonable ratio of Fe-Al compound is a quantitative criterion of interfacial embrittlement, that is, when the ratio of Fe-Al compound at interface is larger than 71.5%, interfacial embrittlement will occur.
文摘QTi3.5 10graphite(mass fraction, %) slurry was prepared using electromagnetic mechanical stirring technology. The distribution of graphite particles in QTi3.5 10graphite slurry was studied using cold quenching method. The results show that solid fraction of QTi3.5 10graphite slurry increases with the decreasing stirring temperature. There is a linear relationship between solid fraction and stirring temperature. With increasing solid fraction, the rising of graphite particles in slurry is restricted gradually. When the solid fraction is larger than 42.5%, the rising of graphite particles in slurry can be controlled, and QTi3.5 10graphite slurry with uniform distribution of graphite particles can be prepared.
文摘The pressing bonding of steel plate to QTi3.5-3.5graphite slurry was studied. The bonding conditions were 620 ℃ for preheating temperature of steel plate, 530 ℃ for preheating temperature of dies, 50 MPa for pressure and 2 min for pressing time. The relationship between the solid fraction of QTi3.5-3.5graphite slurry and the interfacial mechanical property of bonding plate was obtained. The results show that when the solid fraction of QTi3.5-3.5graphite slurry is smaller than 45.8%, the interfacial shear strength of bonding plate increases with the increasing of solid fraction. When the solid fraction is larger than 45.8%, the interfacial shear strength decreases with the increasing of solid fraction. When the solid fraction is 45.8%, the largest interfacial shear strength of bonding plate 127 MPa can be got, and the interface is made up of Fe-Cu solid solution.
文摘The bonding of solid steel plate to liquid aluminum was studied by using rapid solidification. The relationship between the bonding parameters such as preheat temperature of steel plate, temperature of aluminum liquid and bonding time, and the interfacial shear strength of bonding plate was established by artificial neural networks perfectly. This relationship was optimized with a genetic algorithm. The optimum bonding parameters are: 226 ℃ for preheat temperature of steel plate, 723 ℃ for temperature of aluminum liquid and 15.8 s for bonding time, and the largest interfacial shear strength of bonding plate is 71.6 MPa.
文摘The rolling treatment of steel/mushy Al 20Sn bonding plate was conducted under different relative reduction at room temperature. The effect of room temperature rolling on interfacial mechanical property of bonding plate was studied. The results show that, for steel/mushy Al 20Sn bonding plate which consists of 1.2mm thick 08Al steel plate and 2.0mm thick Al 20Sn layer, the relationship between interfacial shear strength and relative reduction is S=70.1+5.48r-r 2 (S is interfacial shear strength, r is relative reduction). When the relative reduction is 2.74%, the largest interfacial shear strength 77.6 MPa can be obtained.
