最新刊期
卷 ， 期 4 ， 2001
- 摘要：Rapidly solidified high silicon aluminum alloy powders were prepared by ultrasonic gas ato mization process. Phase constituent, microstructure characteristics, micro-hard ness of the alloy and influence of ageing treatment were studied systematically . The results showed that the microstructure of high silicon aluminu m alloy powders prepared by ultrasonic gas atomization process mainly consists o f fine particle Si phase distributed dispersedly in matrix and needle-like Al 9FeSi 3 phase. The diffraction peaks of the matrix and Si phase were broaden in a certain extent in the XRD diagram. The microstructure and phase constituent o f the alloy powder by ageing treatment are almost unchanged but the diffraction peak width is narrowed slightly. The micro-hardness of the alloy powder decreas ed somewhat in the initial stage of the ageing following unchanged with the pro longing of the ageing time.
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发布时间：2023-12-18 - 摘要：The phase constituent and microstructure of Ti-Si syst em cast alloy wer e studied. It was found by XRD that the peak values of the Ti5Si3 phase were out standing gradually with the increase of the Si content in the alloy. And th e microstructure of the Ti-Si alloy evolved from the lamellar or basket we ave solid solution structure to the typical rod eutectic structure. The results showed that the microstructure of the cast Ti-Si alloys were completely differ ent from the microstructure of the troditional cast Ti alloy.关键词：Ti-Si Alloy;Ti5Si3;Microstructure;Evolution
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发布时间：2023-12-18 - 摘要：The morphology of wear surface and sub-surface of the network ceramic reinforced aluminum matrix composite was analyzed. The results s howed that the wear mechanism of composite is more complex than that of the matrix alloy. Both the cohesion wear and abrasion occurr simultaneously. Also oxidation occurs in the wear process. The composite has higher wear-resistance than the matrix alloy because the partial load is subjected to ceramic particle and mechanical mixture layer is formed on the surface.关键词：Network Ceramic Reinforced Aluminum Matrix Composite;Wear Surface;Cohesion;Abrasion
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发布时间：2023-12-18 - 摘要：The relationship of the thickness and effectively acted distance of the chill with secondary dendrite arm spacing and casting mod ulus was investigated. The results indicated that the secondary dendrite arm spa cing of casting sample decre ased with the increase of chill thickness. The specimen diameter and the chill t hickness significantly influenced the effective functional distance of chill. Wi th the increase of specimen diameter, the chill thickness should be increased.Th e network diagram for relationship among casting modulus, thickness of cas ting hot spot and required thickness of chill was plotted.The relationship of chill thickness with secondary dendrite arm spacing and loca l solidification rate was studied. The mathematical expression for relation betw een local solidification rate and secondary dendrite arm spacing was built. It c ould be concluded from the expression that the required secondary dendrite arm s pacing could be attained for any modulus of A357 alloy castings when the local s olidification rate was rationally controlled.关键词：Chill;Secondary Dendrite Arm Spacing;solidification rate
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发布时间：2023-12-18 - 摘要：Electro-pulsing modification on liquid ZL108 alloy was conducted.The results showed that the solidification microstructure of electro -pulsing modified ZL108 alloy exhibited P modification characteristics.The mech anical properties of heat treated alloy is raised significantly.The given techno logy was a substitutive modification method to be applied to improve the wear re sistance and anti-fading capacity of ZL108 alloy.关键词：Electro-pulsing Modification;ZL108 Alloy;Solidification Mi crostructure;Mechanical Properties;Anti-fading Capacity
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发布时间：2023-12-18 - 摘要：Based on selective laser sintering（SLS） rapid plastic prototype with precision casting technology, metallic parts are made. The ther mal degradation characteristics of plastic powder for prototype is studied . The rapid casting process from 3D solid mould to metallic parts was designed. The preparation of ceramic shell and casting process of metallic parts are exp ounded and the part accuracy is measured.关键词：Rapid Prototype;Selective Laser Sintering;Precision Cas ting;Metallic Parts
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发布时间：2023-12-18 - 摘要：Squeeze casting die for wrench handle has been des igned based on structure of new handle of aluminum alloy pipe wrench. The die st ructural parameters and squeeze casting technological parameters were optimized. The parts produced with the die could meet completely the design requirement th rough production practice.关键词：Aluminum Alloy;Pipe Wrench;Squeeze Casting;Die
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发布时间：2023-12-18 - 摘要：The inclined migration of the primary phase in alloy me lt towards radical direction is taken place under centrifugal force field,leadin g to its inclined distribution in solidified casting.As a results,the gradient v ariation of physical parameters,sucha as coefficients of thermal expansion and c onductivity etc.are followed.Accordingly,so-called functionally gradient materi als are defined.关键词：Centrifugal Casting;In-situ Functionally Gradient Materia ls;Physical Value
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发布时间：2023-12-18 - 摘要：The thin-walled 316L stainless steel parts was prepare d by laser rapid prototyping. The results showed that the shaped parts with com pact microstructure is characterized by the dendrite and the uniformly distribu ted chemical composition. And the mechanical properties of the thin-wa lled metal parts by laser rapid prototyping were comparable to those of the conventionally machined metal parts.关键词：Laser Rapid Prototyping;Dendrite;316L Stainless S teel
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发布时间：2023-12-18 - 摘要：The vacuum differential-pressure casting （VDPC）technol ogy for thin-wall ed Al alloy was introduced. The technology has the features of simplified device , stable and adjustable mold filling, good mold filling ability and high castin g quality. The deepened study on the technology was conducted and the basic prin ciple of the technology was expounded. The results showed the VDPC suitable for product of thin-walled casting has good linear relation of filling pressure wit h time and excellent mold filling ability as compared with conventional gravity c asting and vacuum suction casting.关键词：Aluminum Alloy;Vacuum Differential-pressure Casting;Thin-walled Casting
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发布时间：2023-12-18 - 摘要：Fe-Si nanocrystalline alloy by mechanically alloying m ethod was prepared. Fe 33Si 67 mixture powder treated by various mecha nically alloying processes was analyzed by X-ray diffraction, scanning electron microscope and energy dispersive X-ray analysis system. The results showed tha t Fe 33Si 67 mixture powder could realize mechanically alloying by ball grinding for 20 h. At last, Fe-Si nanocrystalline alloy could be obtained with continuous ball grinding for alloyed powder grain.关键词：Fe-Si Alloy;Mechanical Alloying;Nanocrystalline Alloy
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发布时间：2023-12-18 -
- 摘要：The die-casting TiC/AlSi9Cu1.4Mg0.5 composite has been prepared successfully by both smelting in-situ reaction and die casting tec hnique. The mechanical properties of the composites were measured. The results showed that t he ultimate tensile strength of the die casting TiC/AlSi9Cu1.4Mg0.5 composites w ith 354 MPa at room temperature and 272 MPa at 260 ℃, are higher by 26% and 46% than those of the matrix alloy（280 MPa and 186 MPa）respec ti vely. The elongation of the die casting composite at room temperature and 260 ℃ are comparable to those of the conventional AlSi9Cu 1.4Mg0.5 alloy.关键词：In-Situ Reaction;Die Casting;Aluminum Matrix Composite;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Influence of the Cu content on the behav ior of solid solution treated new type Al-Mg-Si alloy was studied. The results showed that the over-heating susceptivity and the probability of maximum har dness, ultimate tensile strength and θ″ precipitation increased with the increase of the Cu content in aged alloy at 180 ℃ for 4 h.关键词：Al-Mg-Si Alloy;Cu Content;Solid Solution;Mechanical Pr operties;θ”Phase
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发布时间：2023-12-18 - 摘要：Intranet is the developing trend of management informat ion system. The basic idea and process of development and establishment of casting enterprise MI S based on intranet were expounded. A developed example was given.关键词：Management Information System;Intranet;Casting Enterprise
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发布时间：2023-12-18 - 摘要：The conserved scale method has been used to determine t he morphology of the free surface during mold filling. The disadvantages of much shorter time step in numerical simulation has been overcome by adopting two dif ferent time steps to calculate flow field and free surface, so as to enhance gre atly the calculation speed of the numerical simulation during mold filling and meet the accuracy requirement in the engineering application.关键词：Conserved Scale Method;Time Step;Mold Filling;Numerical Simulation
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发布时间：2023-12-18 - 摘要：The basic formula of degassing and slag removal of aluminum melt was introduced systematically. The effect of various process parameters for dega ssing and slag removal were expounded theoretically, focusing on spinnin g rotary degassing with flux injection ceramic foam filtering and plasma Ar jet purifying techniques. Two of three kinds modifier for aluminum alloy wer e mainly introduced. AlTiB modification effect has related to production metho d in first kind modifier; various Sr adding methods and their modification effec ts have introduced in second kind modifier. The charge treatment involves heredity of raw materials and iron removal.关键词：Aluminum Melt;Refinement;Modification;Charge Treatment
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发布时间：2023-12-18 - 摘要：The development of semi-solid casting technology for M g alloy was surve yed. The application prospect and significance of this forming technology in China was evaluated also. The latest research progress of numerical simulatio n for semi-solid process was introduced briefly. Finally, some critical problem s to be solved for semi-solid forming technology of Mg alloy in China were p roposed.关键词：Mg Alloy;Semi-solid Casting;Numerical Simulation
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发布时间：2023-12-18 - 摘要：The feather-like crystal that lead to unqualified ingot was found in 7A09 alloy ingot for forging in specification of more than 310 mm. The reason for feather-like crystal formation was studied and corre sponding preventive measures were adopted to have eliminated the defects of feat her-like crystal. Finally, the qualified ingot was obtained.关键词：A09 Alloy;Ingot;Feather-like Crystal
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发布时间：2023-12-18 - 摘要：The analysis of housing parts was analyzed based on the theories of die design, wax pattern making and casting forming. A proposed ra tional investment ingate casting process and formulas for the calculation of ris er and chill applied for practical production.关键词：Wax Pattern Injection;Precision Casting;Technological Design
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发布时间：2023-12-18 -
- 摘要：D software Pro/E was used for die design.A single angl e was substituteed for the complex spacing dimension.The cast is ejected by the acclivitous ejector with spring regression.关键词：D Software;Parting Face;Acclivitous Ejector
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发布时间：2023-12-18 - 摘要：A Set of effective production methods for large investm ent castings was summarized through analysis of the production features and prac tical production experience.
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发布时间：2023-12-18 -
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