最新刊期
卷 ， 期 6 ， 2003
- 摘要：By reformulating the free energy of a system, a new phase field model is derived from closely associating the alloy phase diagram and comprehensively considering the heat transfer, solute diffusion, the anisotropy of interface energy and interface kinetics. Then the equiaxed dendritic growth of Al 7Si alloy in a undercooling melt 35 K and 50 K respectively is simulated using the new phase field model in combination with critical point plane phase field with large gradient calculation area government method that can improve calculating efficiency significantly. The some simulated results in agreement with the experimenttal resaets can be obtained. The traced tip velocities and the tip radiuses of the primary dendrite are derived from the dendrite growth process. In addition, the values of the tip velocity obtained from the simulation are in agreement with those calculated by the KGT model.关键词：Phase Field;Equiaxed Dendrite;Al 7Si Alloy
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- 68
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发布时间：2023-12-18 - 摘要：The relationship between La addition and average length of β Fe phase in recycled ZL102 alloy was examined, and the distribution of La element in β Fe phase and alloy was analyzed. The results showed that La formed stable intermetallic compound in melt and promoted the nucleation of β Fe phase in recycled Al Si alloy during solidification. Meanwhile, the enrichment of La in surface of the β Fe phase restricted its growth. So, RE La element can refine the β Fe phase in recycled alloy significantly.关键词：La RE;β Fe Phase;Refinement;Recycled Al Alloy
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- 254
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发布时间：2023-12-18 - 摘要：Foamed Mg alloy cat’t be obtained because Cl - seriously erods and destroys the framework of Mg alloy matrix during the solution of conventional NaCl stuffing materials while the foamed Mg alloy with 71.4% porosity and 1～1.4 mm porous diameters was prepared successfully with MgSO 4 stuffing due to significantly decrease the erosion in Mg.Morever,the experiment reveals that the MgSO 4 is a ideal stuffing for preparation of foamed Al alloy.关键词：Foamed Mg;Stuffing;Corrosion;Foamed Al
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- 370
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- 28
发布时间：2023-12-18 - 摘要：By self\|developed differential vacuum pressure casting technology Cu47Ti34Zr11Ni8 bulk amorphous alloy with the shape of rod and sheet was prepared,and the thermal stability of the amorphous alloy was examined. The results showed that the rod sample with maximum diameters up to 3 mm and the sheet sample with maximum thickness up to 1 mm can be obtained. The amorphous alloy with glass transition temperature （ T g） 672 K, crystallization temperature （ T x1） 735 K,temperature interval of supercooled liquid region △ T x 63 K and reduced glass transition temperature （ T rg ） 0.575 has excellent thermal stability.关键词：Bulk Amorphous Alloy;Cu based Amorphous Alloy;Thermal Stability;Glass Forming Ability
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- 210
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发布时间：2023-12-18 - 摘要：D microstructure evolution simulation of Mg die casting alloy was conducted by CA（Cellular Automaton） model. Continuous nucleation model was used to describe heterogeneous nucleation of the liquid metal. Gauss distribution function was employed to reveal the relation between the density of nucleation sites and the temperature. At a given undercooling, the nuclei density can be done by intergrating the function. Dendritic tip growth kinetics, effects of temperature field and crystal preferential growth direction < 1 0 1 0> were taken into account in grain growth model. The macro temperature field coupled with microstructure calculation was made. The simulated results were verified by standard tensile bar of Mg die casting alloy. The simulated results were well in agreement with the experiment on average grain sizes.关键词：Mg Die casting Alloy;Microstructure Simulation;CA Method
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- 255
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发布时间：2023-12-18 - 摘要：The microstructure change of solidified ZA43 alloy at high pressure was observed. The alloy exhibited fine microstructure with random distribution, nocoarse dendrite crystal and different shape, as well as near cellular crystal in some transverse section. The eutectic phase seems like uniform and fine vermicular structure. The high pressure improves solid solubility of solute into solid solution and reduces the dendritic segregation. The effects of high pressure on the solidification structure were discussed.关键词：Non equilibrium Solidification;Solidification at High Pressure;ZA43 Alloy
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- 253
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- 10
发布时间：2023-12-18 - 摘要：The effects of vacuum heat treatment on ceramic coating behavior and the key technological parameters were researched. The results showed that the strength of the coating can be raised with increase in temperature of heat treatment. The treated surface quality of the coating has been improved. The heating temperature rate of the heat treatment should not be too fast up to 1 000 ℃.关键词：Vacuum Heat Treatment;Ceramic Materials;Melting and Coagulation at High Temperature
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- 96
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发布时间：2023-12-18 - 摘要：The wear resistance of WC particulate reinforced bearing steel composites prepared by electroslag smelting and casting was studied. The results showed that solution of WC phase into steel matrix and compound carbide along the grain boundary occur. The bonded strength of the interface was improved greatly due to the metallurgical bond in the interface, in which there exits a transitional zone in micro concentration of alloying element. Fatigue crack was firstly originated from the hard particulate suffered higher stress resulting in hard brittle phase drop and aggravating wear.The whole process revealed the comprehensive effect of both fatigue wear and abrasive wear.关键词：Electroslag Smelting and Casting;WC Particulate;Wear;Composites
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- 130
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发布时间：2023-12-18 - 摘要：The experimental results showed that the grain can be refined effectively and the thickness of compound in crystal boundary can be reduced by applying static magnetic field to Mg alloy during solidification process. Meanwhile, a lot of fine lump compound occurs, which is helpful to improve the forming property of the Mg alloy.关键词：Mg Alloy;Electromagnetic Field;Boundary;Compound
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- 179
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发布时间：2023-12-18 - 摘要：Effects of S on solidification segregation and hot plasticity of Hastelloy C 4 alloy were examined by electron probe and hot tensile test. The results showed that the solid liquid phase zone, temperature interval and segregation degree may be obviously enlarged with increasing S content so as to reduce the hot plasticity of the alloy. Therefore, the decrease in S content in the alloy is beneficial to the forging performance of the alloy.关键词：S;Hastelloy C 4 Alloy;Solidification Segregation;Hot Plasticity
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- 72
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发布时间：2023-12-18 - 摘要：A method to drawning of rapid technological card for casting process design was given and realized by ObjectARX program under sub development circumstance of AutoCAD.关键词：Casting Process CAD;Technological Card;ObjectARX
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- 93
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发布时间：2023-12-18 - 摘要：The 3D mesh automatic generation of casting and cast mold is a prerequisite for metal solidification simulation of real shape. Using slice method and making the slice a little offset from oddity point,generated 3D right angle hexahedron mesh by automatic mesh generation based on STL files provided space location information on casting and cast mold for finite differential calculation in solidification simulation. The method with simple theory and rapid programization is a high efficient and accurate technique suitable for meshing entity with arbitrary shape.关键词：STL;Slice Method;Mesh Generation;Numerical Simulation
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- 253
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发布时间：2023-12-18 - 摘要：Based on finite differential method （FDM）,3D numerical simulation for casting thermal stress was conducted. The thermal stress of a standard stress frame sample and a case casting were simulated and the satisfactory results were obtained. The method used identical discrete model in analysis of stress/strain and heat transfer so as to avoid the node match and load delivery of unit temperature in different model of FDM/FEM. Therefore, the unified differential method can be used in simulation for flow field, temperature field and stress field.关键词：Thermal Stress Field;Numerical Simulation;Finite Differential Method
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- 425
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发布时间：2023-12-18 - 摘要：The correlation of die casting industry with automotive industry, and industrial structure, market prospects and technological trend of Chinese die casting industry were expounded. It is pointed out that the Chinese die casting industry has entered into a new developing stage with the leap of automotive industry.关键词：Die Casting;Automotive Industry;Correlation;Market;Technology
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- 89
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- 4
发布时间：2023-12-18 - 摘要：The hydrogen storage principle of metallic hydride is briefly introduced. The latest progress in RE series, AB 2 type Laves phase, BCC solid solution type and Mg based hydrogen storage alloy were surveyed. The application of hydrogen storage alloy used for hydrogen storage container, Ni/MH cell, hydride heat pump, catalyst, hydrogen purification etc. were briefly introduced. The problems of low hydrogen storage capacity, pulverization and performance degradation in hydrogen storage alloy were analyzed. The developing trend of hydrogen storage alloy was predicted.关键词：Hydrogen Storage Alloy;Capacity of Hydrogen Storage;Research and Application
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- 1606
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发布时间：2023-12-18 - 摘要：The indirect squeezing casting process and the die structure for the Mg alloy were investigated. With full sealed quantitative pneumatic transporting system and air removal from die cavity with N 2 or Ar gas. It is effective to prevent Mg alloy from oxidation and ignition during transpotation, pouring and forming. In the case of filling rate 2.0～2.5 m/s and squeezing force 500 kN, the Mg alloy castings with sound structure was produced. Specially designed independent heating device was used for heating the plunger and the sleeve in the quantitative chamber up to 450～500 ℃. The single clearance between plunger and the sleeve equaled 0.02～ 0.05 mm.关键词：Mg Alloy;Squeezing Casting;Die
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- 363
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- 2
发布时间：2023-12-18 - 摘要：Experiment on corrosion resistance of W based alloy in liquid Al alloy was conduced. The results showed that corrosion resistance of W based alloy in liquid Al alloy is superior to 3Cr2W8V and 45# steel, especially higher by about 10 times than those of 3Cr2W8V and 45# steel at temperature ranging from 640 to 740℃. Therefore, W based alloy can be used for the die with deep cavity or the die surface subjected to washing away from liquid alloy during ingate setup,and especially for the die in thin walled complicated casting.关键词：Die Casting Die;Tool Materials;Soldering Resistance
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- 108
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- 1
发布时间：2023-12-18 - 摘要：Different wax pattern assembly design aimed at structural features of different castings can ensure convenient coating and stuccoing, favor hardening and drying of shell mold, avoid pileup of coating and bubble in shell mold. Also, the wax smooth removal from shell mold and higher technological yield of castings should be ensured in the design of gating system.关键词：Wax pattern Assembly;Shell Making;Dewaxing;Technological Yield
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- 222
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发布时间：2023-12-18 - 摘要：Two kinds of enhanced fast drying colloidal silica, FS Ⅲ and FS Ⅱ, were introduced and the drying period between dip coat can be reduced to 1～2 h, of which the shell drying rate and shell performance of FS Ⅲ were relatively excellent. The mechanism of fast enhancement of shell processing was discussed and the parameters of shell making and their application were presented.关键词：Investment Casting;Binder;Enhanced Fast Drying
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- 377
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发布时间：2023-12-18 - 摘要：The sprue sections influence the technological yield of small castings in investment casting. The sprue with square or hexagonal section is superior to the sprue with round section for technological yield of the casting by theoretical analysis and actual verification.关键词：Small Castings in Investment Casting;Sprue Section;Technological Yield
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- 90
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发布时间：2023-12-18 -
- 摘要：Aimed at C inclusion often encountered in QT casting in lost foam casting, the experiments in foamed pattern making and pouring of the casting were introduced briefly. The formation and elimination of C inclusion in the hub castings were analyzed. The scrap rate of the machined casting decreased from 70% in trial production period until now up to 10% due to great reduction of C inclusion through adjusting gating system, governing the density of foam pattern, reducing amounts of foamed pattern gas evolvement,increasing pouring temperature and regulating the negative pressure.关键词：Lost Foam Casting;Ductile Iron Component;Hub of Forklift Truck;C Inclusion
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- 162
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发布时间：2023-12-18 -
- 摘要：Assembly and structural features of W type cast iron drain pipe in centrifugal casting were introduced. Comparison with other types of drain pipes was conducted. The goal, requirement and method of quality monitoring in the processing of drain pipe were proposed.关键词：W Type Drain Pipe;Centrifugal Casting;Quality Monitoring
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- 21
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发布时间：2023-12-18 - 摘要：The Cu Cr master alloy containing 4.0%～5.0% Cr can be prepared by addition of Cu 50Cr master alloy and controlling smelting process with special cover agent in a medium frequency induction furnace under air atmosphere.关键词：Cu Cr Alloy;Smelting;Cover Agent
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- 132
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发布时间：2023-12-18 - 摘要：Influence of different crystallizer and cover agents on surface quality of round Cu ingot with P deoxidation in channel induction furnace was expounded.The defects including surface crack, cold shut and surface splinter on alloy ingot were eliminated.关键词：Cu with P Deoxidation;Crystallizer;Cover Agent
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- 50
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发布时间：2023-12-18 -
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