As the aircraft and aerospace industry and the automobile industry are developed, the demand of reliable materials with high strength and high toughness is steadily increased. The grain miniature method which improves...As the aircraft and aerospace industry and the automobile industry are developed, the demand of reliable materials with high strength and high toughness is steadily increased. The grain miniature method which improves the ductility and the toughness simultaneously under high strength is the miniature of the casting microstructure. In this paper, the Nb which affects the austenite grain miniature is added by 0.00%, 0.03% and 0.06% in this steel and the ingot is manufactured in a vacuum induction melting furnace （VIM）. The casting microstructure and the mechanical property of the maraging steel according to Nb contents are analyzed by conducting the solution annealing and the age hardening after hot rolling. In this result, a specimen containing 0.03% Nb is most miniature. When it does the long time age hardening, the precipitation estimated as the carbide is appeared. The mechanical properties are excellent if a specimen containing 0.06% Nb does the age hardening during 8 h in 482℃.展开更多
A mechanical model was developed for the lifting mechanism of a prototype of the VCF-3t cantilevered vacuum arc furnace,the position and value of maximum stress of the column was obtained through force analysis of the...A mechanical model was developed for the lifting mechanism of a prototype of the VCF-3t cantilevered vacuum arc furnace,the position and value of maximum stress of the column was obtained through force analysis of the main bearing parts(such as column).Then the actual equipment model was simplified to establish finite element model and the stress cloud chart was compared with actual calculated value in order to test the correctness of the finite element model.On this base,combined with the relationships among actual structure sizes of the furnace,the parametric finite element model was established.If the model meet conditions of intensity and stiffness etc.,the radius and thickness of the column and furnace body was optimized with the optimizer of ANSYS to make the mass of mechanical structure to be the lightest and make full use of the material's property.At the same time,VB language was used in the call analysis interface in ANSYS to provide an intuitive man-machine system in order to decrease duplication of workload in series design of product.The parameter optimization method used in this paper is an important development of structural optimization design method and has important practical value in the structural design.展开更多
基金supported by Research Funds from Chosun University,2007.
文摘As the aircraft and aerospace industry and the automobile industry are developed, the demand of reliable materials with high strength and high toughness is steadily increased. The grain miniature method which improves the ductility and the toughness simultaneously under high strength is the miniature of the casting microstructure. In this paper, the Nb which affects the austenite grain miniature is added by 0.00%, 0.03% and 0.06% in this steel and the ingot is manufactured in a vacuum induction melting furnace （VIM）. The casting microstructure and the mechanical property of the maraging steel according to Nb contents are analyzed by conducting the solution annealing and the age hardening after hot rolling. In this result, a specimen containing 0.03% Nb is most miniature. When it does the long time age hardening, the precipitation estimated as the carbide is appeared. The mechanical properties are excellent if a specimen containing 0.06% Nb does the age hardening during 8 h in 482℃.
文摘A mechanical model was developed for the lifting mechanism of a prototype of the VCF-3t cantilevered vacuum arc furnace,the position and value of maximum stress of the column was obtained through force analysis of the main bearing parts(such as column).Then the actual equipment model was simplified to establish finite element model and the stress cloud chart was compared with actual calculated value in order to test the correctness of the finite element model.On this base,combined with the relationships among actual structure sizes of the furnace,the parametric finite element model was established.If the model meet conditions of intensity and stiffness etc.,the radius and thickness of the column and furnace body was optimized with the optimizer of ANSYS to make the mass of mechanical structure to be the lightest and make full use of the material's property.At the same time,VB language was used in the call analysis interface in ANSYS to provide an intuitive man-machine system in order to decrease duplication of workload in series design of product.The parameter optimization method used in this paper is an important development of structural optimization design method and has important practical value in the structural design.
