最新刊期
卷 ， 期 3 ， 2001
- 摘要：The nucleation and growth characteristics of pre eutectic solid solution phase in Zn Al alloys with aluminum content of w （Al）=3.0%～28.4% were studied with quantitative metallographic analysis of probes prepared by liquid quenching during the unidirectional solidification process. The results showed that both pre eutectic Zn rich phase and Al rich phase have the same features of instantaneous nucleation but have different characteristic growth. The pre eutectic Zn rich phase grows more rapidly after nucleation, and then more slowly while pre eutectic Al rich β and α phases do more slowly after nucleation and more rapidly with enough under cooling. The β phase not only grows on α phase by peritectic reaction of L+α→β, but also nucleates directly from the remainder liquid phase.关键词：Zn Al Alloy;Pre eutectic Solid Solution;Nucleation and Growth
- 2
- |
- 239
- |
- 4
发布时间：2023-12-18 - 摘要：Based on some phenomena in microarc oxidation process, the regularity of current and voltage variation and the mechanism of microarc occurrence were investigated. The results showed that the voltage is one of the key factors influencing microarc oxidation during microarc oxidation process, so the voltage couldn’t be too high. Otherwise the ceramic film would be destroyed. The currents were different in the different stages of microarc oxidation. There are distinct periods in the process of microarc oxidation which could be preliminarily divided into three periods: primary ceramic film formation, microarc induction and oxidation balance.关键词：Microarc Oxidation;Voltage;Current
- 2
- |
- 551
- |
- 15
发布时间：2023-12-18 - 摘要：The united mechanical model and constitutive equation were established through comprehensive analysis of the rheological properties of the Cu alloy, cast steel and Al alloy in liquid solid co existing temperature range on the basis of test for the rheological properties of cast steel and Cu alloy in liquid solid state, combining with other people’s achievements in the rheological properties of Al alloys. The law of rheological parameters varying with temperature change was analyzed. The characteristics of rheological properties of alloy in liquid solid state from the micro view point was analyzed关键词：Liquid solid Alloy;Rheological Properties;Mechanical Pattern;Constitutive Equation
- 2
- |
- 76
- |
- 1
发布时间：2023-12-18 - 摘要：The linear contraction characteristics SiC particulate reinforced cast aluminum matrix composite F 3B was studied. The linear contraction of three kinds of F3B composite （φ（SiC）=10%, 20%, 30% respectively） and their correspondent matrix alloy were measured by means of“direct measurement” and “ZQS 2000 twin bar alloy hot crack linear contraction apparatus”. The results showed that the three F 3B composites have better linear contraction characteristics than the correspondent matrix alloys. The linear contraction rate of the three F3B composites decreases with the increase of SiC content.关键词：Cast Aluminum Matrix Composite;Linear Contraction;Particulate Reinforced
- 2
- |
- 90
- |
- 0
发布时间：2023-12-18 - 摘要：Aimed to the fact that pre expanded copolymer beads have a lot of troubles with quality control in domestic discontinuous pre expander, the technology for low pressure steam inlet, pre expanded during holding pressure and rapid material outlet is developed. The fine pre expanded copolymer beads（0.3～0.4 mm） with dry stack density 0.020～0.024 g/cm 3 are achieved. Morever, the examination of the structure of external appearance and internal fracture for pre expanding beads by SEM could provide technological references for optimum pre expanding process.关键词：Copolymer;Lost Foam Pattern;Pre expansion Technology
- 2
- |
- 76
- |
- 1
发布时间：2023-12-18 - 摘要：Based on the mechanical parts assembly of the twin bar tester of hot tearing linear contraction for alloy, a new way to testing hot tearing behavior of Mg alloy was developed. In the system, resin precoated sand was used as molding material to solve the combustion of Mg alloy during pouring process. The signal data of temperature, stress and shrinkage were recorded and further treated with curves drawn by computer through A/D conversion. Results indicated that AZ91 alloy would precipitate eutectic phase not coinciding with equilibrium phase diagram under the conventional solidification condition. The temperature most susceptible to be hot torn was located near the practical solidified end temperature（420 ℃） for AZ91 alloy.关键词：Hot Tear;Microcomputer Testing;Stress;Solidification;Mg Alloy
- 2
- |
- 280
- |
- 5
发布时间：2023-12-18 - 摘要：Some various Al Fe Si alloys by centrifugal casting was conducted. The results showed that under the centrifugal field, primary phase in alloy migrated along the radical direction but the migration effects of the primary phase with various sizes were different. Meanwhile, the element concentration has different variation under the centrifugal field. The sloping changes of the primary phase distribution and the element concentration would results in the gradient variation of relevant properties and form functionally gradient materials to certain extent.关键词：Centrifugal Casting;Functionally Gradient Materials;Primary Phase
- 2
- |
- 57
- |
- 2
发布时间：2023-12-18 - 摘要：The surface inclusion in cast rolling aluminum strip was observed and analyzed by means of SEM and EDAX. The results showed that the inclusion size ranges around 5～200μm and the inclusion consists of O, C, S, Cl, Na, K, Ca, Fe, Mg,Si. Impurity in raw and auxiliary materials, pollution in smelting casting process and abnormally purified treatment are the reason of forming inclusion. Heredity of the surface inclusion results in aluminum foils cracking and forming dispersively penetrated hole. The formation of entrapped slag could be prevented effectively by strictly controlling and up grading the process关键词：Inclusion;Cast rolling;Aluminum Strip;Characteristics
- 2
- |
- 101
- |
- 1
发布时间：2023-12-18 - 摘要：The effects of Al 10Sr on 3%TiB 2/ZL102 composite were investigated.The results showed that compared to modification of ZL102 alloy,the much more amount of Al 10Sr was used for the composite in order to obtain good modification effects.The increase of Al 10Sr modifier has no relation with Ti and TiB 2 in the composite.But relation to the reaction of surplus B in the composite and Sr to generate SrB 6 in result of the declination of modification effects.The best proportion between Ti and B is 2.2 to 1 during the fabrication of composite.关键词：Al 10Sr Modifier;TiB 2/ZL102 Composite;Modification;SrB 6
- 2
- |
- 78
- |
- 5
发布时间：2023-12-18 - 摘要：The enforced by France Peugeot Citron P.S.A Group standard of the composition and mechanical properties of the aluminum alloy for cylinder head of car engine was introduced. Using national raw materials,the as cast mechanical properties of the A S5U3G aluminum alloy could be reached to the France standard through composition optimization关键词：A S5U3G Alloy;As cast;Optimization
- 2
- |
- 172
- |
- 1
发布时间：2023-12-18 - 摘要：A new casting technology for inlet manifold in tilt casting machine for gravity die casting was described. In order to producte qualified inlet manifold casting, top gating system with lip riser and shell core made of precoated sand is used. The gas hole, shrinkage cavity and crack were eliminated through up grading technology.关键词：Gravity Die Casting;Gating System;Shell Core;Crack
- 2
- |
- 207
- |
- 1
发布时间：2023-12-18 - 摘要：A simplified and practical calculation for different constituents of furnace burden was proposed based on the features of furnace charge for non ferrous alloy melting. The way has good applicable value to furnace burden for conventional non ferrous alloy.关键词：Non ferrous Alloy;Furnace Charge;Calculation
- 2
- |
- 65
- |
- 0
发布时间：2023-12-18 - 摘要：The scrap ratio of floating sealing rings with high CrMo white cast iron was about 45% in ceramic mold. The reason of scrap formation was attributed to the composition far from eutectic point and heating calibration circle through statistic analysis and metallographic observation. The total scrap ratio of floating sealing ring decreased below 10% through controlling the iron melt composition, canceling heating calibration circle and adjusting production procedure so as to obtain the good technic economic benefits.关键词：High CrMo Alloy Cast Iron;Floating Sealing Ring;Eutectic Point;Heating Calibration Circle
- 2
- |
- 37
- |
- 0
发布时间：2023-12-18 - 摘要：The process for producing aluminum alloy damping cylinder in low pressure casting was introduced.The key processing factors were expounded also.The principle to determine the technological parameters in the process of low pressure casting was analyzed theoretically.关键词：Low pressure Casting;Damping Cylinder;Aluminum Alloy
- 2
- |
- 51
- |
- 2
发布时间：2023-12-18 -
- 摘要：An example of fixed model 3D CAM and processing method for die casting die was expounded. The processing method and requirement of correcting concave Cu electrode for fixed die cavity was introduced in detail.关键词：CAM;Die Casting;Die
- 2
- |
- 79
- |
- 2
发布时间：2023-12-18 - 摘要：The mathematical pattern for dry sand filling and compaction in casting pattern cavity of horizontal cylinderical casting in EPC has been obtained on the basis of a lot of experiments and theoretical calculations. The correspondent image display program was developed. The dynamic process of dry sand filling and compaction could be visually observed on screen when the developed program was used, which gave a reference for forecasting the casting defects and optimizing processing parameters ahead of casting production and improving casting quality.关键词：EPC;Dry Sand Filling and Compaction;Image Display Program
- 2
- |
- 47
- |
- 0
发布时间：2023-12-18 - 摘要：The rheological behavior and mold filling process of wax materials in investment casting were analyzed. The mathematical model for numerical simulation of wax material during mold filling process was established. The relevant software system was founded based on computer numerical simulation. The results of simulation for cap casting wax pattern during mold filling process are coincident with the experimental verification.关键词：Mold Filling Process;Numerical Simulation;Flow Field;Investment Casting
- 2
- |
- 374
- |
- 6
发布时间：2023-12-18 - 摘要：The development and application status of rammed graphite mold, refractory metal powder,face coated mold shell and oxide face coated ceramic mold shell for cast Ti alloy in domestic and foreign countries were introduced. The technological gap between home and abroad was compared. The suggestion on developing new and non pollution molding materials for mold shell was proposed.关键词：Ti Alloy;Investment Casting;Mold Shell Materials
- 2
- |
- 705
- |
- 8
发布时间：2023-12-18 - 摘要：Methods to preventing Mg alloy from burning in domestic and foreign countries were introduced. In the methods,alloying element addition, including Ce rich RE,has the obvious effect on ignition proof of Mg alloy. The results showed that the addition of Ce rich RE could increase initial combustion temperature of Mg alloy by 70 ℃. In China with abundant Mg RE resource, the ignition proof of Mg alloy should be focused on RE addition, to prevent Mg alloy from burning and to promote wide application of Mg alloy at home using conventional cold chamber die casting machine.关键词：Die Casting Mg Alloy;RE;Ignition Proof
- 2
- |
- 131
- |
- 5
发布时间：2023-12-18 - 摘要：Who could transform an innovation in design suitable for market demand into merchandise in leading position would create favorable condition owning more market portion. It is a powerful method to combine rapid prototyping with casting technology to produce metal part and metal mold for enterprise participating into market competition.关键词：Rapid Prototyping;Rapid Foundry;Metal Parts;Metal Molds
- 2
- |
- 87
- |
- 1
发布时间：2023-12-18 - 摘要：The present situation of the national and international magnesium trade was analyzed and the reason for anti dumping measures against chinese magnesium export in the international market was analyzed also. The counter measures taken against anti dumping by chinese magnesium trade as well as the directions for future development were proposed.关键词：Mg Trade;Mg Alloy;Anti dumping
- 2
- |
- 35
- |
- 1
发布时间：2023-12-18 - 摘要：The way to tone setting and tune setting of Qing chime bell was introduced in Investment Casting. The twelve average tone correspondent relationship between ancient and modern China was pointed out. The operation technology of tune setting and eliminating two tune of Qing chime bells were expounded.关键词：Chime Bells;Tune setting;Tone
- 2
- |
- 81
- |
- 0
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