Semisolid ZL101 aluminum slurry was prepared by a micro fused-casting process.The nozzle temperature has great effects on the microstructure and mechanical properties,which are primarily influenced through changing co...Semisolid ZL101 aluminum slurry was prepared by a micro fused-casting process.The nozzle temperature has great effects on the microstructure and mechanical properties,which are primarily influenced through changing cooling conditions of the fused-casting area.With the decline of nozzle temperatures,the microstructure of semisolid ZL101 aluminum slurry tends to be more homogeneous,delivering smaller grains.Temperatures of liquids and solids were measured by differential scanning calorimetry(DSC).Distribution and characteristics of microstructure were examined by scanning electron microscopy(SEM)equipped with energy dispersive spectrometer(EDS)and optical microscope(OM).It is found that uniform shape and good grain size are observed for semisolid samples fabricated by micro fused-casting under conditions including nozzle temperature of 592℃,bucket temperature of 600℃,stirring velocity of 600 r/min and channel diameter of 3 mm.Due to the smaller average grain size of 53μm and shape factor of 0.71 for the fine grains,the ultrahigh average tensile strength and Vickers hardness can reach(181±1.25)MPa and(87.95±1.18)HV for the optimized semisolid ZL101 aluminum slurry,respectively.展开更多
A novel micro fused-casting(MFC)process is developed for semisolid aluminum alloy slurry.The microstructure evolution and properties of semisolid ZL101 aluminum alloy slurry with difierent pouring temperature by MFC a...A novel micro fused-casting(MFC)process is developed for semisolid aluminum alloy slurry.The microstructure evolution and properties of semisolid ZL101 aluminum alloy slurry with difierent pouring temperature by MFC are investigated in this paper.During the cooling process,the effects of the pouring temperature on microstructure and properties is primarily analyzed.The microstructure of the semisolid ZL101 aluminum alloy is more homogeneous and the grain is smaller under proper pouring temperature.Temperature of liquids and solids of ZL101 aluminum alloy is measured by difierential scanning calorimetry(DSC).Distribution and characteristics of the microstructure of samples are examined by optical microscope(OM),scanning electron microscopy(SEM)equipped with energy dispersive spectrometer(EDS).The results show that the ZL101 semisolid slurry fabricated by MFC presents uniform shape and good grain size under the pouring temperature of 594°C and the stirring velocity of 600 r/min,and the fine grains of the primary a-Al phase with average grain size of 55μm and shape factor up to 0.67 were obtained.Besides,the ultimate tensile strength and the average Vickers hardness for semisolid ZL101 aluminum slurry are 178.19±1.37 MPa and 86.15±1.16 HV,respectively.展开更多
A novel semisolid micro fused-casting(MFC) for preparing A356 alloy strips is proposed, and the effects of process parameters of pouring temperature on the microstructure and properties of A356 alloy strips are invest...A novel semisolid micro fused-casting(MFC) for preparing A356 alloy strips is proposed, and the effects of process parameters of pouring temperature on the microstructure and properties of A356 alloy strips are investigated. MFC means that the semisolid metal slurry was pressed out from the outlet of bottom of crucible to the movable plate, and directly solidified and formed layer by layer. The microstructure and properties of A356 semisolid alloy slurry were influenced by the cooling conditions. Results show that the aluminu alloy A356 strip samples fabricated by micro fused-casting had good performances and uniform structures with the pouring temperature at 595 ℃ and the substrate movement speed at 18 mm/s. The fine grains of the primary a-Al phase with average grain size of 53 μm and shape factor up to 0.72 was obtained, the ultimate tensile strength of the aluminum alloy A356 strip reaches 243.79±3.91 MPa, while the average vickers hardness is 82.65±1.86 HV.展开更多
The semisolid A356 alloy strip was prepared by a novel continuous micro fused-casting process. The microstructure evolution and mechanical property of A356 aluminum alloy strip with different nozzle temperatures were ...The semisolid A356 alloy strip was prepared by a novel continuous micro fused-casting process. The microstructure evolution and mechanical property of A356 aluminum alloy strip with different nozzle temperatures were investigated. The nozzle temperature had great influences on the microstructure and property primarily accompanied with the crystal change in the fused-casting area through the cooling conditions. The results showed that the semisolid A356 alloy strip samples fabricated by micro fused-casting demonstrated good performances and uniform structures with the nozzle temperature at 593 ℃ and the stirring velocity at 700 r/min. The fine grains of the primary α-Al phase with average grain size of 51 μm and shape factor up to 0.71 were obtained under the micro fused-casting process, and the ultimate average vickers hardness came up to 83.39±0.89 HV, and the tensile strength and elongation of the A356 alloy strip reached 245.32 MPa and 7.85%, respectively.展开更多
A novel semisolid continuous Micro Fused-Casting additive manufacturing technology for producing a ZL101 alloy strip was developed, Micro Fused-Casting means that the semisolid metal slurry was pressed out from the ou...A novel semisolid continuous Micro Fused-Casting additive manufacturing technology for producing a ZL101 alloy strip was developed, Micro Fused-Casting means that the semisolid metal slurry was pressed out from the outlet of bottom of crucible to the movable plate. The degree of sub-cooling was easily provided by movement of substrate in the micro fused-casting area. Under the aid of 3 D manufacturing software, the ZL101 alloy strip was solidified and formed layer by layer. The microstructure and properties of ZL101 semisolid slurry were improved by the cooling conditions. The results showed that the ZL101 alloy strip samples fabricated by Micro Fused-Casting had uniform structures and good performances with the substrate movement speed at 20 mm/s and the temperature at 590 ℃, the ultimate tensile strength and elongation of the ZL101 alloy strip reached 242.59 MPa and 7.71%, while the average Vickers hardness was 82.55 HV.展开更多
A novel micro fused-casting for metal（MFCM） process for producing A356 aluminum alloy slurry was proposed. MFCM means that the refined metal slurry is pressed out from the outlet of bottom of crucible to the horizon...A novel micro fused-casting for metal（MFCM） process for producing A356 aluminum alloy slurry was proposed. MFCM means that the refined metal slurry is pressed out from the outlet of bottom of crucible to the horizontal movable plate. With the aid of 3D manufacturing software, the melt is solidified and formed layer by layer. The stirring could keep the ingredients and the heat diffusion of metal slurry uniform in the crucible due to the shear force breaking down the dendrite arms. The solidus and liquidus temperatures of A356 alloy were 559.2 and 626.3 ℃, respectively, which were measured by differential scanning calorimetry（DSC）. Effect of different stirring velocities of MFCM on the microstructure and mechanical properties of A356 slurry was investigated with the pouring temperature controlled at 620 ℃. The microstructure and mechanical performance were the best when the stirring velocity was 1 200 r/min in MFCM. The microstructures of the A356 aluminum alloy slurry were mainly composed of fine spherical or rose grains. The average roundness and average grain size reached 2.2 and 41 μm and the tensile strength of A356 alloy slurry reached 207.8 MPa, while the average vickers hardness was 81.1 HV.展开更多
In order to investigate corrosive phenomena of fused-cast Al_2O_3-ZrO_2-SiO_2(AZS) refractory materials by molten glass,two types of fused-cast AZS refractory bricks were taken as the interests of the research to stud...In order to investigate corrosive phenomena of fused-cast Al_2O_3-ZrO_2-SiO_2(AZS) refractory materials by molten glass,two types of fused-cast AZS refractory bricks were taken as the interests of the research to study static corrosion rates(mm/d) of the two type materials by molten soda-lime-silica glass at different temperatures(1400,1450 and 1500 *C) and for different isothermal periods(0.5,1.0 and 1.5 d).It was shown that static corrosion rate of each AZS material by molten glass at the triple point developed with raising temperature but slightly decreased with enhancing isothermal period.Based on chemical compositions,microstructures,and corrosive morphologies of AZS refractory materials,the relation between them and static corrosion rates of AZS refractory materials by molten glass was analyzed.展开更多
基金Funded by the Natural Science Foundation of Henan Province(No.252300420256)。
文摘Semisolid ZL101 aluminum slurry was prepared by a micro fused-casting process.The nozzle temperature has great effects on the microstructure and mechanical properties,which are primarily influenced through changing cooling conditions of the fused-casting area.With the decline of nozzle temperatures,the microstructure of semisolid ZL101 aluminum slurry tends to be more homogeneous,delivering smaller grains.Temperatures of liquids and solids were measured by differential scanning calorimetry(DSC).Distribution and characteristics of microstructure were examined by scanning electron microscopy(SEM)equipped with energy dispersive spectrometer(EDS)and optical microscope(OM).It is found that uniform shape and good grain size are observed for semisolid samples fabricated by micro fused-casting under conditions including nozzle temperature of 592℃,bucket temperature of 600℃,stirring velocity of 600 r/min and channel diameter of 3 mm.Due to the smaller average grain size of 53μm and shape factor of 0.71 for the fine grains,the ultrahigh average tensile strength and Vickers hardness can reach(181±1.25)MPa and(87.95±1.18)HV for the optimized semisolid ZL101 aluminum slurry,respectively.
基金Funded by the National Natural Science Foundation of China(No.51341009)。
文摘A novel micro fused-casting(MFC)process is developed for semisolid aluminum alloy slurry.The microstructure evolution and properties of semisolid ZL101 aluminum alloy slurry with difierent pouring temperature by MFC are investigated in this paper.During the cooling process,the effects of the pouring temperature on microstructure and properties is primarily analyzed.The microstructure of the semisolid ZL101 aluminum alloy is more homogeneous and the grain is smaller under proper pouring temperature.Temperature of liquids and solids of ZL101 aluminum alloy is measured by difierential scanning calorimetry(DSC).Distribution and characteristics of the microstructure of samples are examined by optical microscope(OM),scanning electron microscopy(SEM)equipped with energy dispersive spectrometer(EDS).The results show that the ZL101 semisolid slurry fabricated by MFC presents uniform shape and good grain size under the pouring temperature of 594°C and the stirring velocity of 600 r/min,and the fine grains of the primary a-Al phase with average grain size of 55μm and shape factor up to 0.67 were obtained.Besides,the ultimate tensile strength and the average Vickers hardness for semisolid ZL101 aluminum slurry are 178.19±1.37 MPa and 86.15±1.16 HV,respectively.
文摘A novel semisolid micro fused-casting(MFC) for preparing A356 alloy strips is proposed, and the effects of process parameters of pouring temperature on the microstructure and properties of A356 alloy strips are investigated. MFC means that the semisolid metal slurry was pressed out from the outlet of bottom of crucible to the movable plate, and directly solidified and formed layer by layer. The microstructure and properties of A356 semisolid alloy slurry were influenced by the cooling conditions. Results show that the aluminu alloy A356 strip samples fabricated by micro fused-casting had good performances and uniform structures with the pouring temperature at 595 ℃ and the substrate movement speed at 18 mm/s. The fine grains of the primary a-Al phase with average grain size of 53 μm and shape factor up to 0.72 was obtained, the ultimate tensile strength of the aluminum alloy A356 strip reaches 243.79±3.91 MPa, while the average vickers hardness is 82.65±1.86 HV.
基金Funded by the National Natural Science Foundation of China(No.51341009)。
文摘The semisolid A356 alloy strip was prepared by a novel continuous micro fused-casting process. The microstructure evolution and mechanical property of A356 aluminum alloy strip with different nozzle temperatures were investigated. The nozzle temperature had great influences on the microstructure and property primarily accompanied with the crystal change in the fused-casting area through the cooling conditions. The results showed that the semisolid A356 alloy strip samples fabricated by micro fused-casting demonstrated good performances and uniform structures with the nozzle temperature at 593 ℃ and the stirring velocity at 700 r/min. The fine grains of the primary α-Al phase with average grain size of 51 μm and shape factor up to 0.71 were obtained under the micro fused-casting process, and the ultimate average vickers hardness came up to 83.39±0.89 HV, and the tensile strength and elongation of the A356 alloy strip reached 245.32 MPa and 7.85%, respectively.
基金Funded by the National Natural Science Foundation of China(No.51341009)
文摘A novel semisolid continuous Micro Fused-Casting additive manufacturing technology for producing a ZL101 alloy strip was developed, Micro Fused-Casting means that the semisolid metal slurry was pressed out from the outlet of bottom of crucible to the movable plate. The degree of sub-cooling was easily provided by movement of substrate in the micro fused-casting area. Under the aid of 3 D manufacturing software, the ZL101 alloy strip was solidified and formed layer by layer. The microstructure and properties of ZL101 semisolid slurry were improved by the cooling conditions. The results showed that the ZL101 alloy strip samples fabricated by Micro Fused-Casting had uniform structures and good performances with the substrate movement speed at 20 mm/s and the temperature at 590 ℃, the ultimate tensile strength and elongation of the ZL101 alloy strip reached 242.59 MPa and 7.71%, while the average Vickers hardness was 82.55 HV.
基金Funded by the National Natural Science Foundation of China(No.51341009)
文摘A novel micro fused-casting for metal（MFCM） process for producing A356 aluminum alloy slurry was proposed. MFCM means that the refined metal slurry is pressed out from the outlet of bottom of crucible to the horizontal movable plate. With the aid of 3D manufacturing software, the melt is solidified and formed layer by layer. The stirring could keep the ingredients and the heat diffusion of metal slurry uniform in the crucible due to the shear force breaking down the dendrite arms. The solidus and liquidus temperatures of A356 alloy were 559.2 and 626.3 ℃, respectively, which were measured by differential scanning calorimetry（DSC）. Effect of different stirring velocities of MFCM on the microstructure and mechanical properties of A356 slurry was investigated with the pouring temperature controlled at 620 ℃. The microstructure and mechanical performance were the best when the stirring velocity was 1 200 r/min in MFCM. The microstructures of the A356 aluminum alloy slurry were mainly composed of fine spherical or rose grains. The average roundness and average grain size reached 2.2 and 41 μm and the tensile strength of A356 alloy slurry reached 207.8 MPa, while the average vickers hardness was 81.1 HV.
基金financial support by National Natural Science Foundation of China(51172221,51472227)Major Program of Scientific Instrument and Equipment Development of China(2011YQ140145)+1 种基金National High Technology Research and Development Program of China(863 Program,2015AA034204)Project of Science and Technology Department of Guangdong Province(2015B010919007)
文摘In order to investigate corrosive phenomena of fused-cast Al_2O_3-ZrO_2-SiO_2(AZS) refractory materials by molten glass,two types of fused-cast AZS refractory bricks were taken as the interests of the research to study static corrosion rates(mm/d) of the two type materials by molten soda-lime-silica glass at different temperatures(1400,1450 and 1500 *C) and for different isothermal periods(0.5,1.0 and 1.5 d).It was shown that static corrosion rate of each AZS material by molten glass at the triple point developed with raising temperature but slightly decreased with enhancing isothermal period.Based on chemical compositions,microstructures,and corrosive morphologies of AZS refractory materials,the relation between them and static corrosion rates of AZS refractory materials by molten glass was analyzed.
