最新刊期
卷 ， 期 1 ， 2002
- 摘要：The evolution mechanism of crystal growth at the initial stage of eutectic solidification in binary hypoeutectic Al-Li alloy under vertical upward unidirectional solidification was studied. The research showed that the primary crystal would grow stably in the mode of regular eutectic at optimized technological parameters while the regular crystal growth couldn’t he obtained due to the disturbance of the melt at unsuitable prameters. The fomiation of lamellar eutectic was attributed to the compositional segregation in master alloy. Surface energy in the grain boundary will lead to crystal defect with different grain orientations.关键词：Unidirectional Solidification;Eutectic Growth;Evolution Mechanism;Al-U Alloy
- 2
- |
- 129
- |
- 2
发布时间：2023-12-18 - 摘要：The structure of rapidly solidified Al-4Zr-2Ti （atom percentage） with spinning technique was investigated by means of TEM. The results showed that the micro-hardness values were closely correlated with the microstructure of the rapidly solidffied alloy. Melt-spun inicrostructuze of rapidly solidified alloy was founded to be single-phase-supersaturated Al base solid solution and the micro-hardness values were 220 HV. The metastable phase L1\-2-A1\-3（Zr,Ti） with cubic Li\-2 stnrcture was precipitated from the rapidly solidified alloy during annealing for 4 hours at 420℃ and the micro-hardness reached peak values of 260 HV while the Li\-2 phase in rapidly solidified alloy was transformed into DO 23 phase during annealing for 20 hours at 420℃ and the micro-hardness values decreased up to 150 HV.关键词：Rapid Solidification;Al-Zr-Ti Alloy;Microstructure;Micro-Hardness
- 2
- |
- 63
- |
- 2
发布时间：2023-12-18 - 摘要：The prepared LC\-4 billet with SLMA technology and LC\-9 billet with liqudius-quenching were used to investigate microstructure evolution of Al-Zn-Mg alloy in semi-solid state during hot working. The law of microstructure evolution for the two kinds of alloy in semi-solid state during hot working was quite different because the SLMA technology was fully different from liqudius quenching. Grain size of LC\-4 grew up due to coalescence while the microstructure of LC\-9 didn’ t show any evident change. Microstructural component after and before hot working semi-solid state was analyzed by SEM and energy spectrum analysis. The results showed that the grain boundary was composed of eutectic area, area rich in Cu with low melting point and impurity area. Moreover, the liquid film of reheating microstructure for LC 9 alloy was thicker than for LC 4 alloy, and the composition of the workpiece in different part in semi-solid state after hot working is basically even, which has verified the lamellar flow model for the billet in semi-solid state during hot working.关键词：Hot Working in Semi-solid State;Microstructune Evolution;Lamellar Flow
- 2
- |
- 133
- |
- 8
发布时间：2023-12-18 - 摘要：Creep resistances of Mg-Li alloy and MgO/Mg\-2Si particulate reinforced Mg-Li matrix composite prepared by reaction synthesis in liquid at room and elevated temperatures were studied. The results showed that the creep resistance of the composite is significantly higher than that of the matrix alloy and the effect is better with the increase of temperature. The creep rate of the composite is 10% and 2% of matrix alloy at room temperature and 160℃. The mechanism could be attributed to the increase of the yield stress and Young’ s modulus of composite by MgO/Mg2Si particulate, to the restriction of relative sliding of grain boundary, to the block of dislocation movement, and to the reduction of diffusion rate of atoms and vacancies.关键词：Mg-Li Alloy;Composite;Creep Resistance
- 2
- |
- 268
- |
- 2
发布时间：2023-12-18 - 摘要：Rapid manufacturing pmcess of the die for housing castings in DISA cast line was intmduced. Based on 3D modeling and rapid pmtotyping in combination with coating transferring investment casting technology, the iron die was made. The manufacturing process has the advantages of high rate, low cost, high die precision and is suitable for wide application in die making of DISA cast line关键词：DISA Cast Line;3D Modeling;Prototyping;Coating Transferring;Metal Die
- 2
- |
- 132
- |
- 5
发布时间：2023-12-18 -
- 摘要：The technological measures was studied to eliminate segregation and detrimental effect of w（Mn） = 0.8% in UADI. The detrimental effects of high Mn content on microstmcture and properties were eliminated through the increase of Si content, the enhancing of inoculation, the decrease of austenizied temperature and temper treatment after isothermal quenching.关键词：UADI;Segregation;White Bright Zone
- 2
- |
- 67
- |
- 1
发布时间：2023-12-18 - 摘要：A new measure & contml system for moisture content in molding sand was introduced. We has developed a capacitant integral moisture sensor to conduct the measurement and contml for moisture in molding sand in the system that based on Micro-computer used as the main controller. The system with advanced data collection and automatic contml technique has the advantages of high control accuracy, reliable ran and convenient assembly & operation. The system could meet the requirement inpractical application.关键词：Molding Sand;Moisture;Measure and Control
- 2
- |
- 68
- |
- 2
发布时间：2023-12-18 -
- 摘要：The intelligent CAD system for the design of triangular belt-wheel die-casting die was developed based on object orientation expression in the combination MFC with MDT 3.0 3D molding software. The system, consisting of expert system and drawing processing system, could automatically form entity and engineering drawings of die-casting die of solid wheel and spokes, and then the design period was greatly shortened.关键词：Triangular Belt-wheel;Die Casting Die;CAD
- 2
- |
- 41
- |
- 3
发布时间：2023-12-18 - 摘要：The review and prospect of casting process for light alloy integral wheel for motorbike in China was surveyed. Different casting processes used for producing the wheel were analyzed comparatively. It is considered that low-pressure casting should be first to be used for pinducing the wheel. The measures and suggestion on development of casting process were offered for light alloy integral wheel of motorbike in China.关键词：Motorbike Wheel;Casting Process;Low-pressure Casting
- 2
- |
- 72
- |
- 1
发布时间：2023-12-18 - 摘要：The preparation principle and characteristics of the inner ceramic-lined compound steel pipe were intinduced. The existing problems in the compound steel pipe were analyzed. At the same time, the future researeh orientation of the inner ceramic-lined compound steel pipe was analyzed and forecast also.关键词：Inner Ceramic-lined;Compound Steel Pipe;SHS;Micro-crack
- 2
- |
- 116
- |
- 3
发布时间：2023-12-18 - 摘要：The laws, niles and standaids of enviinnmental protection in China were intinduced. The pollution resourees possibly often existing in investment casting pincess, including pattern making& assembly, shell making & burnout, smelting, pouring and cleaning, cutting off & grinding, were approached in combination with the practical condition in investment casting process. Based on the above analysis, some suggestions and advices were presented for sustainable development in investment casting in China.关键词：Investmet Casting;Sustainable Developnnt;Environmental Protection;Standard
- 2
- |
- 534
- |
- 2
发布时间：2023-12-18 - 摘要：The key measutes for preventing shrinkage hole （porosity） in investment steel castings were expounded systemically based on actual production: （1） transfening: shrinkage holes transferred from casting into gating feeding system, （2） dispersion: shrinkage hole dispersed into much small shrinkage porosity.关键词：Investment Casting;Cast-steel;Shrinkage Hole （Porosity）
- 2
- |
- 180
- |
- 8
发布时间：2023-12-18 - 摘要：Measures of preventing deformation of wax pattern and mold shell for aluminum bronze high-speed propeller in investment casting was introduced. Smelting of aluminum bronze in lightly oxidized atmosphere and the use of ceramic filter during pouring process were expounded also.关键词：Aluminum Bronze;Investment Casting;Filtering Technique
- 2
- |
- 168
- |
- 3
发布时间：2023-12-18 - 摘要：Metal melding board and graphite core were used for impropving sand casting technology. Impmved sand mold used for replacement of plaster mold in investment casting for box of positive sample machine has the advantages of low cost, high dimensional accuracy and low surface roughness.
- 2
- |
- 46
- |
- 0
发布时间：2023-12-18 - 摘要：The profile of die casting industiy in southeast Asia, Japan, Hongkong, Taiwan district and the other countries was surveyed. The market and the international position of die casting industry in China were summarized.关键词：Die Casting Industry;Die Casting Market;International Position
- 2
- |
- 119
- |
- 2
发布时间：2023-12-18 - 摘要：According to the chamcteristics of indirect squeeze casting process, the design flow of technological process of cast die, basic principle and key points in die strnctural design were proposed. Some key design programs were expounded in detail. It is proposed that the runner location should be first to be selected to ensure molten metal filling along the die wall in order to reduce melt flow resistance and then ingate should be located in the heavy section of the workpiece to which the melt would be filled at the beginning. As a result, the applied pressure could be transmitted fluently to avoid shrinkage cavity and to ensure castings quality.关键词：Squeezing Casting;Die Design;Die Structure
- 2
- |
- 256
- |
- 19
发布时间：2023-12-18 - 摘要：The effect of some factors on the die service life in die casting was found through comparative test of various die materials, heat treated pmcess and operating conditions. And then the effective ways, including pre-heating of the die, variety of release agents and its injection method, selection of die materials and heat treatments were used for elevating the die service life in die casting.关键词：Die Casting Die;Chap;Thernmal Fatigue;Nitration;Vacuum Quenching
- 2
- |
- 374
- |
- 11
发布时间：2023-12-18 -
-
-
- 摘要：It is of great importance of cast-mould permeability to get sound EPC casting. The effect of factors on the permeability of dry sand and coating were discussed. The dry sand preferred round sands ranging from 25 meshes to 45 meshes AFS. Proper refractory materials and binders should be selected for coating and the coating density should be controlled. There has a preference for one coating layer. There isn’ t a common standard for test method of EPC coating up to present关键词：EPC;Cast Mould;Permeability
- 2
- |
- 105
- |
- 2
发布时间：2023-12-18 - 摘要：Aimed at the effect of degraded products of EPS pattern and coating performance on the castings quality in EPC process, a test device and method for the influence of EPC coating on transfer behavior of EPS degraded products were introduced. Influence of thickness, composition and pemieability at high temperature of EPC coating on transfer behavior of EPS degraded products was discussed.关键词：EPC Coating;Degraded Product;Tranansfer Behavior
- 2
- |
- 136
- |
- 2
发布时间：2023-12-18 - 摘要：Some aspects in cast-iron drainpipe production in centrifugal casting, such as machine type, influence of coating, formation of pit and pin-hole defects, were analyzed and approached. The qualified cast-pipe free from pit, pin-hole, network vein and scum could be produced under proper casting process and pertinent coating perfomiance reganilless of fully automatic centrifugal or simplified cast-pipe machine. The coating performance and technology have a great effect on the surface quality of cast-pipe and the service life of pipe mold. The keyreason for the fomiation of network vein in inner surface of cast-pipe is liquid iron quality.关键词：Centrifugal Casting;Cast Iron Drainpipe;Casting Machine
- 2
- |
- 93
- |
- 1
发布时间：2023-12-18 - 摘要：Some feasible methods were summarized for aluminum alloy thin-walled casting blister for Boeing aircraft. The use of zigzag sprue with three curved paths ingate is beneficial to reducing oxidation, gas pick up and entrapped slag, and the use of step-to-step filling is helpful to form good solidified temperature gradient, and the use of 1 -2 h additional core baking at 150±10℃ before mold assembly is favorable to eliminating gas hole.关键词：Thin-Wall;Aluinirnun Alloy;Blister
- 2
- |
- 70
- |
- 0
发布时间：2023-12-18 -
- 摘要：Coarse grain and un-homogenous Ag content during continuous casting lead to poor flatness and low strength of Cu-Ag alloy tramcar touching wire, so the grain should be fined and Ag content should be unifonninged. The comprehensive performance of the tramcar touching wire could be improved through smelting at high temperature, drawing pole at low temperature and raising the liquid alloy storage in crystallizer bottom.
- 2
- |
- 128
- |
- 2
发布时间：2023-12-18 -
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0