最新刊期
卷 ， 期 2 ， 2003
- 摘要：We have developed a new Al Ti C grain refiner to examine the grain refining ability for the commercially pure aluminum. The effects of C content in Al Ti C, addition of Al Ti C, holding time and pouring temperature on grain refining effectiveness of Al Ti C were examined. The results showed that grain obtained in the ingot was refined sharply by adding 0.2%（weight） Al 5.14Ti 0.3C into commercially pure aluminum melt at 725 ℃for 2.5 min holding time. Refining mechanism of Al Ti C for commercial pure aluminum was presented.关键词：Al Ti C Refiner;Grain Refining;TiC
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发布时间：2023-12-18 - 摘要：The interactive effects of cooling rate and hydrogen content on refinement of primary silicon in hypereutectic Al Si alloy were studied by HYSCANⅡ hydrogen tester and multi stepped specimens. The results showed that both hydrogen content in melt and cooling rate exhibited mutually stimulative interactive effects on refinement of the primary silicon. Refinement effects on primary silicon were stable and independent on hydrogen content and cooling rate with less than 0.2 mL/100 g and 0.144 k/s （equivalent to 50 mm thickness of the specimens） in sand casting respectively. Average size of the primary silicon is approximately 18 μm.关键词：Cooling Rate;Hydrogen Content;Refinement;Hypereutectic Aluminum silicon Alloy
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- 106
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发布时间：2023-12-18 - 摘要：Mg 2Si/ZM5 Mg composites were prepared by vacuum induction furnace under the protection of Ar gas atmosphere. The effects of Si on as cast microstructure and properties of in situ Mg 2Si/ZM5 composites were observed and analyzed by means of OM,SEM, EDAX and XRD as well as tensile testing. The results showed that Mg 2Si intermetallic compound with high melting point and high hardness formed by additive reactant Si reacting on ZM5 base alloy can greatly improve strength of the composites at both ambient and elevated temperatures. The tensile strength and yield strength at ambient temperature increased by 20.1% and 61.5% respectively with 1.5% Si addition, and at elevated temperature increased by 14.9% and 25.7% respectively with 0.5% Si addition. Morphology of Mg 2Si phase varied with Si content. It is fine short rod like or flake eutectic Mg 2Si with adding 0.5% Si, and become bulk or Chinese script primary Mg 2Si plus flake or short rod like eutectic Mg 2Si with increasing more than 1.0%Si addition. Owing to Mg 2Si brittle phase, the Mg 2Si/ZM5 matrix composite presented the cleavage fracture, resulting in decreasing its plasticity.关键词：ZM5 Matrix Composites;In Situ;Mg 2Si
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- 170
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发布时间：2023-12-18 - 摘要：Li content in Al Li alloy prepared by conventional smelting process can’t exceed 3%, otherwise serious segregation could occur in the alloy. Binary Al Li alloy containing （5～10）% Li can be prepared by using micro gravity electromagnetic force simulation facilities. The technological process adopted is discussed as follows: the Al ingot and Li stick set in the BN coated pure graphite crucible electric furnace begin to be heated when vacuated up to 10Pa and the furnace is charged with argon gas up to 40 Pa as continuing heating to 300 ℃. Then heating stops as melt temperature reaches to 760 ℃ with holding time for 40min. Meanwhile exciting electric current applies to ferromagnet and direct current applies to the melt. Finally the demagnetization was performed as melt temperature drops to solidification temperature with continuing air cooling. The experiment verifies that segregation of the alloy can be prevented by the techniques.关键词：Micro gravity Electromagnetic Force Simulation;Al Li Alloy;Segregation
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- 269
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发布时间：2023-12-18 - 摘要：The structure features of ZA42 alloy melt with TRT were investigated by DTA and TEM.The results showed that there appeared to be a heating effect in the alloy at about 810 ℃.As increasing melt temperature in rapidly cooling,structure of the melt tends to be homogeneous and to increases transition grey phase.At the same time,crystal lattice parameter of a-Al solid solution in the alloy increases.关键词：ZA42 Alloy;TRT;Melt Structure
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- 127
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发布时间：2023-12-18 - 摘要：The effects of the preheating temperature, the thickness and immersion time of 08A1 steel strip master and the temperature of cladding liquid brass on the thickness of brass cladding layer by inversion solidification process were investigated systematically. The results showed that the thickness variation of the brass cladding layer involved sequentially in solidification growth, equilibrium holding and remelting stages with increasing in immersion time. Variation of temperature of liquid brass as well as preheating temperature and thickness of steel strip did not change the thickness variation pattern of cladding layer, but affected the holding time at individual stages and thickness of the cladding layer. Increase in the thickness and decrease in preheating temperature of steel strip and decrease in temperature of liquid brass could be beneficial to increasing the cladding thickness.关键词：Inversion Solidification;Cladding Strip;Cladding Layer;Cladding Ratio
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- 81
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发布时间：2023-12-18 - 摘要：The situation of mould manufacturing for inlet manifold in rapid prototyping and investment casting was introduced. The results showed that the process has merits in shortening time and reducing the cost of mould manufacturing.关键词：Mould Manufacturing;Rapid Prototyping;Rapid Mould;Investment Casting
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- 124
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发布时间：2023-12-18 - 摘要：The process of dual frequency electromagnetic forming with small cross section rod feeding is studied. The results showed that shielded screen can regulate the magnetic flux density distribution to assure melt in ideal state in forming inductor. A certain distance between two inductors must be maintained so that the magnetic field in the preheating inductor has no effect on that in forming inductor for steady shaping. There should be a rational drawing velocity to match electrical power under other constant conditions. At last, heat resistant stainless steel parts with qualified surface can be obtained.关键词：Small Cross Section Rod Feeding;Dual frequency Electromagnetic Shaping;Heat resistant Stainless Steel
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发布时间：2023-12-18 - 摘要：The errors encountered in FDM mesh generation were introduced.The errors were related to mesh precision.Problems of mould cavity connectivity caused by the errors were discussed. And then a method to detect mould connectivity after FDM mesh generation was presented.关键词：FDM;Mesh Generation;Mould Cavity Connectivity;Detection
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发布时间：2023-12-18 - 摘要：Mathematic model of heat transfer in round crystallizer with water cooled jacket in horizontal continuous casting for iron bar was established. Heat transfer process of water cooled jacket system with various height width ratio of the water channel was calculated by the finite differential method. With increasing value of height width ratio of water channel K , both the velocity of water flow in the cooled jacket and equivalent heat transfer area of water channel section decreased so that the cooling capacity of cooled jacket was weaken. The design principle for water cooled jacket in round cystallizer was provided based on the calculated results.关键词：Round Crystallizer;Height width Ratio;Design Principle
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- 168
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发布时间：2023-12-18 - 摘要：Gas film soft contacted continuous casting has been investigated based on both experiment and theoretical calculation. It is founded that continuity and stability of gas film has great effects on the billet quality. The gas backpressure increased with the increase in the gas volume and decreased with the increase in drawing speed, which provided important experimental base for further improving technology and design of crystallizer in continuous casting.关键词：Continuous Casting;Gas Film;Soft Contact
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发布时间：2023-12-18 - 摘要：Reinforcement coating is one of the most effective methods to enhance wettability of metal/ceramic interface home and aboard. Present research status of effects of the coating on the wettability of Al/SiC and Al/Al 2O 3 interfaces was surveyed. The effects of metallic coating and ceramic coating on the wettability of Al/SiC and Al/ Al 2O 3 interface were emphasized.. The problems presented in research and developing tendency were approached关键词：Reinforcement Coatings;Wettability;Aluminum Matrix Composites
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- 337
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发布时间：2023-12-18 - 摘要：Developing survey of traditional unidirectional solidification was reviewed and its shortcomings were presented. Development of novel technologies in unidirectional solidification was introduced at home. Latest progress in unidirectional solidification research was surveyed at home under the conditions of electric field, natural and forced convections, varying growth rate and melt superheating. The developing tendency of unidirectional solidification was predicted.关键词：Unidirectional Solidification;Thermal Gradient;Growth Rate
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发布时间：2023-12-18 - 摘要：The present research status of heat resistance Mg alloy was expounded. Influence of alloying elements, including RE,Sn,Si, Ca, Sr, Ag, on the properties of Mg alloy, especially on its heat resistance, was introduced. Some approaches to improving properties of Mg alloy at elevated temperature were surveyed. And properties of various types of heat resistance Mg alloy were analyzed. It was concluded that the main developing tendency for heat resistance of Mg alloy was involved in disperse precipitation of Mg Re compound with high melting point.关键词：Heat Resistance Mg Alloy;High Temperature Behaviors;Creep Resistance
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发布时间：2023-12-18 - 摘要：Aimed to the defects of liquid phase segregation, microporosity, misrun and dross revealed in semi solid rheoforming, the size and structure of chamber, billet, gate runner, bob and gas release system were optimized and studied in detail. Based on mentioned above study, a set of general mould for testing sample in semi solid rheoforming was designed. The mould can be used for various conventional alloy testing samples in semi solid rheoforming, including tensile, impact, fatigue, fracture toughness, abrasive wear behaviors. Sound casting yield with allowance less than 3 mm,tolerance IT9 and roughness less than 6.3μm Ra value in the mould in squeezing casting can reach over 98%. It is indicated that the machined sample manufactured in the mould can actually reflect the features of products in semi solid rheoforming.关键词：Semi solid;Rheoforming;Property Testing;Mould
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发布时间：2023-12-18 - 摘要：Formation mechanism of the crack and its preventive methods in die casting were studied. It is found that formation of the crack can be prevented effectively by controlling chemical composition of the materials, increasing casting round and reducing difference of wall thickness in possibly permitted range, properly distributing temperature field and improving venting condition in die.关键词：Die Casting;Die Casting Component;Crack
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发布时间：2023-12-18 - 摘要：We have developed a measuring equipment to examine the mercury flowing process with electromagnetic stirring for simulating the flow behavior of steel\|iron slurry in semi solid rheoforming. The results showed that rotating speed of metal fluid increased with raising the input voltage under a proper stirring frequency. There exists an angular speed difference in rotating metal fluid under electro magnetic stirring. Once more, with the increase in input voltage, angular speed difference was more obvious and stirring effects were more remarkable.关键词：Semi solid Forming;Rheological Slurry;Electromagnetic Stirring;Semi solid Metal
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发布时间：2023-12-18 -
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Experiments for Hot Mold Shell with Isolated Hot spot by Local Water Quenching in Investment Casting
摘要：Experiments for hot mold shell with isolated hot spot by local water quenching in investment casting before and after pouring were conducted. The results showed that hot mold shell by local water quenching can increase in solidifying rate of isolated hot spot effectively resulting in significant prevention from shrinkage hole（porosity） before pouring while it dose after pouring, but a large amount of vapors formed by water quenching was entrapped into casting, resulting in generating a lot of mottle spots or mottled caves after pouring.关键词：Investment Casting;Isolated Hot Spot;Water Quenching- 2
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发布时间：2023-12-18 -
- 摘要：EPC process has a history of 40 years in China. Recent years the process has been developed greatly. According to incomplete statistics, casting products in EPC were approximately 85500t in 2001 year, equivalent to that 6.5 times in 1995 year, with more rapidly increasing growth rate in the future. Although great advance in technology and other aspects have been done, there is remarkable gap compared with advanced countries in the world. Our foundrymen should work and study very hard to innovate EPC technologies catching up with strong countries in foundry trade.关键词：Foundry;Full Mold Casting;Casting Equippment;Casting Quality
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- 350
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发布时间：2023-12-18 - 摘要：Mold filling characteristics of Al alloy in vacuum lost foam low pressure casting （VLFLPC） under counter gravity condition were examined. A variety of the regulations along with the flowing front of ZL101 Al melt and the corresponding filling is time curves in the VLFLPC at various conditions, including vacuum rate, pouring temperature, in gate area, were made with electrode touching dot method. The effects of key factors on filling behaviors of liquid Al alloy in the VLFLPC were analyzed.关键词：Al Alloy;Lost Foam Casting;Vacuum Low Pressure Casting;Filling Characteristics
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- 275
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发布时间：2023-12-18 - 摘要：The effects of vacuum sealing materials used in measuring system for the detection of liquid aluminum quality show that soft graphite has good chemical stability and no pollution for liquid aluminum at elevated temperature. Sealing and performance behaviors of the material can fully meet the measuring requirement for liquid aluminum. The soft graphite can be considered as an ideal vacuum thermal sealing material .关键词：Soft Graphite;Vacuum Seal;Measure;Aluminum
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发布时间：2023-12-18 -
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