最新刊期
卷 38 ， 期 2 ， 2018
- 摘要：Bridgman type directional solidification and isothermal peritectic transformation experiments were carried out for Cu-75 Sn alloy in which the peritectic phase has trace solid solubility.Microstructure and composition analysis were characterized by scanning electron microscopy（SEM）,energy dispersive spectrum analysis（EDS）and electron probe micro-analyser（EPMA）.The results reveal that the directional solidification process of Cu-75 Sn hyperperitectic alloy presents a typical non-equilibrium solidification and there exist a large number of primaryεphase in microstructures.EDS and EPMA analysis of the solute profile shows that the tin concentration in theεandηphases is uniform closing to the equilibrium values in the phase diagram,whereas solute concentration in theε/ηand L/ηphase interfaces is changed abruptly during the peritectic transformation.The phase transition will occur when the solute concentration reaches a certain value.Using peritectic transformation mechanism,the primary phase can be eliminated effectively by static heating preservation.With increasing in holding time and decreasing in initial lath structure size,disappear velocity of primary phase is increased with the high peritectic transformation degree.In this case,the relationship between the volumetric fraction of the peritectic phase and the time t fitsφ（η）=0.597×t0.492 in accord with square root law of solidification.Hence,the peritectic transformation process of Cu-75 Sn is controlled by solute diffusion mechanism.关键词：Cu-75Sn Alloy;Intermetallic Compound;Directional Solidification;Peritectic Transformation
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发布时间：2023-12-18 - 摘要：The microstructure evolution of low angle grain boundaries（LABs）in single crystal superalloy was described.The thermodynamic solidification state in the vicinity of LAB was analyzed.The continuously distributed phaseγ′in the eutectics on the LAB is grown on the one side of the LAB because the whole castings consists of one grain.At the same time,theγphase in the eutectics is grown on the other side to avoid the presence of additionalγ′/γinterface,resulting in that the phase on the one side of LAB different from that on the other side.Both sides of LABs tend to beγ′phase because there is more volume fraction ofγ′phase and theγ′phase can’t change its shape to adopt the LAB based on the rigid orientation relationship betweenγandγ′.关键词：Single Crystal Superalloy;Low Angle Boundary（LAB）;Grain Boundary Energy;Directional Solidification;DD6
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发布时间：2023-12-18 - 摘要：The formation mechanism and prevention of liner segregation in Al-Cu alloy castings were analyzed.Through comparison with three kinds of processes of Al-Cu alloy cylinder castings,the formation condition,formation mechanism and composition of linear segregation in Al-Cu alloy castings were described.And then the prevention of linear segregation in Al-Cu alloy casting was presented.Through optimizing gating system and setting hollow sand core to eliminate hot spot and stress,linear segregation in the castings was eliminated sucessfully.关键词：Linear Segregation;ZL205AAlloy;Castings
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发布时间：2023-12-18 - 摘要：The NbCr2/Cr-xSi alloys were prepared by mechanical alloying and hot pressing.Then,the influence of Si on microstructure and properties of the NbCr2/Cr alloy was investigated.The results reveal that the alloy is composed of Cr solid solution and Laves phase NbCr2.The Nb3Si phase appears in the alloy with the 5.0%Si content.With the increase of Si content,the relative density and fracture toughness of the NbCr2/Cr alloy are decreased gradually,while the Vickers hardness is increased.In addition,the compression strength of the alloy is increased firstly and then decreased,while the yield strength and plastic strain are decreased gradually.The fracture mechanism of the NbCr2/Cr alloy is changed from quasi cleavage fracture to cleavage fracture.关键词：NbCr2/Cr Alloy;Si;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：A self-developed instrument for the high temperature mechanical properties of resin sand was adopted to analyze the influence of the type of resin sand and the addition amount of main components on the high temperature heat tolerance time of resin sand under the reducing atmosphere.The results reveal that the high temperature heat tolerance time of TEA resin sand,no-bake furan resin sand and phenolic resin coated sand is increased successively.In test content range,the high temperature heat tolerance time of resin sand is increased with the increase of resin addition and decreased with the increase of curing agent addition.关键词：Phenolic Resin Coated Sand;No-bake Furan Resin Sand;TEA Resin Sand;Reducing Atmosphere
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发布时间：2023-12-18 - 摘要：Casting simulation method to predicting shrinkage porosities in WE54 magnesium alloy castings was evaluated through comparison between casting experiment and simulation,and the riser effective feeding distance was calculated by simulation software.The results reveal that the distribution of shrinkage porosities in WE54 magnesium alloy castings can be predicted reliably with casting simulation method.At the same thickness,the riser effective feeding distance of WE54 alloy is increased with increasing in width-to-thickness ratio.And with constant width-to-thickness ratio,the feeding distance is decreased with the casting thickness decrease.The results can realize calculation of riser quantity needed to feed a WE54 alloy casting,and the riser designing method for WE54 alloy castings is optimized.关键词：Magnesium Alloy;Sand Casting;Effective Feeding Distance;Riser Design
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发布时间：2023-12-18 -
Effects of Mass Ratio of Y to Zn on Microstructures and Mechanical Properties of ZK Magnesium Alloys
摘要：Based on ZK60alloy,ZYK820and ZYK610alloys with different mass ratio of Zn/Y such as8∶2,6∶1have been prepared by semi-continuous casting.The microstructure and mechanical properties of two alloys prepared were investigated by optical microscopy,SEM,XRD and EDS.The effects of Zn/Y mass ratio on the fracture mechanism of ZK60alloy were observed by SEM.The results reveal that the addition of Y has a little effect on the grain size of ZK60alloy,however,grain boundary morphology can be changed obviously.When the mass ratio of Zn/Y is 8∶2,the second phase in the ZYK820alloy is mainly W-Mg3Zn3Y2phase with a trace amount of I-Mg3Zn6Y phase and X-Mg12ZnY phase,while with Zn/Y mass ratio of 6∶1,the second phase is mainly I-Mg3Zn6Y,which are formed at the triangle in form of the fishbone or parallelogram-shaped,while the grain boundaries are extended into the crystal with reticular distribution.When the mass ratio of Zn/Y is 6∶1,tensile strength,yield strength and elongation of the alloy are improved by 4.4%,7.6%and 4%,respectively.In addition,the fracture mechanism is characterized by brittle fracture mixed with a certain toughness fracture.- 2
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发布时间：2023-12-18 - 摘要：ZL105/AZ91 Dbimetal composites with good metallurgical bonding were fabricated by compound casting.After deposited zinc,the ZL105 plate was put into the mould and preheated to 300 ℃,then the fresh liquid AZ91 Dwas poured over it.And then,the sample was held at 500 ℃ for 30 min.OM and SEM results reveal that bonding zone with 0.60.9 mm in thickness can be formed at interface of ZL205 alloy and AZ91 Dalloy with holding for 30 min.XRD analysis reveals that the bonding zone is composed of solution Mg,α-Al phase and Mg17 Al12.The microhardness of the bonding area reaches over（HV）200.Meanwhile,at the same casting condition,without holding treatment,agap can be observed at the bonding zone.The results show that a metallurgical bonding can be obtained between ZL105 and AZ91 Das a result of holding treatment promoting the interfacial reaction.关键词：Electroless Deposited Zinc;Bimetal Compound Casting;Metallurgical Bonding
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发布时间：2023-12-18 - 摘要：The gating system aided design platform was developed with the help of Visual Studio software as system development platform and the C++language as the scripting program by using Open GL technology based on MFC class library.The system can extract geometric features（surface area,volume,et al.）of castings（STL file）,and can calculate the maximum value of the contour of the casting（as the assumed parting surface）according to the preset gravity direction with displaying and outputing calculation results.According to the geometric characteristics of the casting,the calculated results can be used to determine the location of parting surface of the casting and design the gating system.关键词：Parting Surface;Aided Design;Gating System
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发布时间：2023-12-18 - 摘要：The optimized process parameters of self-developed gravity tilting casting equipment were analyzed to prepare 7 A09 aluminum alloy ingot by using Anycasting software,and practical production was conducted based on the optimized parameters.The results show that the qualified 7 A09 aluminum alloy ingots can be prepared sucessfully at 50% gate cup,1/14πrad/s tilting speed,die preheating temperature of 100 ℃ and casting temperature of 700 ℃.关键词：7A09 Aluminum Ingot;Gravity Tilting Casting;Numerical Simulation
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发布时间：2023-12-18 - 摘要：The aging hardening mechanism of several magnesium alloys was reviewed.The crystal structure and morphology of the aged precipitates in the magnesium alloys were analyzed.By summarizing the investigations of aging strengthening and deformation treatment of magnesium alloys,it is pointed out that the key points for improving performance of the aged magnesium alloy are focused on control of precipitation phase,the understanding of interaction and the comprehensive application of various strengthening methods.关键词：Magnesium Alloy;Age Hardening;Precipitated Phase
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发布时间：2023-12-18 - 摘要：Laser additive manufacturing can fabricate metal parts with complex structure and excellent performance,which provides a new way for complex parts manufacturing of the aerospace,military and other areas.However,the internal stress in cladding layers caused by transient melting/solidification tends to make distortion and cracking,which becomes the bottleneck problems of the technology.The research status of auxiliary laser additive manufacturing technology was descirbed to solve the internal stress problem of forming metal parts,and technical characteristics and advantages were analyzed.It is meaningful to solve the tensile stress of metal parts fabricated by laser additive manufacturing.关键词：Laser Additive Manufacturing;Hybrid Additive Manufacturing;Metal 3DPrinting;Internal Stress
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发布时间：2023-12-18 - 摘要：Numerical simulation of filling process in squeeze casting was carried out by using approximate factor method and smoothed particle hydrodynamics method.The simulated results of approximate factor method and the smoothed particle hydrodynamics method are well agreement with the simulated ones of Win-cast software,which verifies the feasibility and effectiveness of two methods.In the smoothed particle hydrodynamics method,particle can carry material properties and move in space.Compared with the traditional finite difference method,there is no difficult to accurately determine the position of free surface and moving material interfaces,exhibiting advantages in establishing mathematical model.关键词：Approximate Factor Method;Smoothed Particle Hydrodynamics Method（SPH）;Squeeze Cast ing;Filling Simulation
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发布时间：2023-12-18 - 摘要：The low pressure casting process of aluminum alloy volute was simulated by Viewcast software,and the position and size of defects in the volute were predicted.The result shows that the final solidification position is located at the thick and large part,and there exist defects such as shrinkage porosities（holes）in the volute.The origination of the defect was analyzed,and a optimization scheme was proposed by adding the sprue and ingate in the middle of the gating system to increase the feeding effect of the thick and large part.The optimized results show that the defects can be eliminated completely,meeting the production requirements.关键词：Low Pressure Casting;Aluminum Alloy Volute;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Structure of B15 Bthrottle valve body,mold structure and problems in the production process were described.With the help of mold flow analysis,feeding system and exhaust-overflowing system of mold were analyzed to solve the problems in production process,effectively decreasing the scrap rate.关键词：Die Casting Die;Feeding System;Exhaust System;Mold Flow Analysis
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发布时间：2023-12-18 - 摘要：The threaded bush is assembled in aluminum die-casting oil pan,and the residual material recycle device with mistake proofing function were developed and applied.By adopting mistake proofing device,the time of rechecking oil pan of threaded bush residual material was reduced.The rate of nonconforming products outflow was declining,and the quality accident was completely eliminated.关键词：Mistake Proofing;Threaded Bush;Die-Casting;Assemble
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发布时间：2023-12-18 - 摘要：The gating system for investment casting automobile steering arm was designed by the ProCAST software,and the casting process was visualized.The optimized casting scheme was presented based on analyzing the simulated results.The feeding system in the optimized design was considered fully.Finally,the finite element analysis of the steering arm was carried out by the ANSYS Software.The results show that the steering arm can meet the requirement.关键词：Stainless Steel;Steering Arm;ProCAST;ANSYS;Optimized Design
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发布时间：2023-12-18 - 摘要：In order to solve the sophisticated process,high cost,low precision problems in traditional subtractive manufacturing method to manufacture titanium alloy straight tooth surface gear,based on rapid casting forming,experimental model of investment casting was established.The processes such as ceramic shell ingredients ratio,steam dewaxing,shell baking,centrifugal casting in vacuum chamber and the post processing were presented.By measured the dimensional accuracy and surface roughness of the investment castings,the results show that the technology can make titanium alloy straight tooth surface gear with comprehensive precision of CT4 and small size error,low surface roughness.In addition,the feasibility of this process was verified.关键词：Straight Tooth Surface Gear;Titanium Alloy;Investment Casting;Casting Shell
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发布时间：2023-12-18 - 摘要：The mechanical vibration was applied to the ZL101 Aaluminum alloy produced by the expendable pattern shell casting to understand the effects of pouring temperature and mechanical vibration on the microstructure and mechanical properties.The results show that without mechanical vibration,the microstructure of the ZL101 Aaluminum alloy exhibits coarse with low mechanical properties.With the mechanical vibration,the microstructure and mechanical properties of aluminum alloy can be improved greatly.With increasing in pouring temperature,the microstructure of the ZL101 Aaluminum alloy can be improved greatly,however,an too high pouring temperature can result in the coarseness of the microstructure.Moreover,the tensile strength,yield strength,elongation and hardness of the ZL101 Aaluminum alloy can be decreased to some extent with increasing in pouring temperature,and an too high pouring temperature can weaken sharply the mechanical properties of the ZL101 A aluminum alloy.Therefore,the mechanical vibration has an optimal effect on the microstructure and mechanical properties of the ZL101 Aaluminum alloy by choosing an appropriate pouring temperature during the expendable pattern shell casting.关键词：Expendable Pattern Shell Casting;Pouring Temperature;Mechanical Vibration;Aluminum Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The microscopic characteristics,microstructure and inclusions of surface defects in centrifugal casting low alloy iron casting mill roller were analyzed by optical microscope and scanning electron microscope,stereoscopic microscopes.The results show that there exist a lot of holes in the mill roller with the depth of 16.23μm.The microstructure is composed of pearlite and cementite,and MnS inclusion and TiC as well as VC precipitates can be observed,and phosphorus segregation zone in the matrix is present.The reasons of the centrifugal casting defects were analyzed according to the production process,and the countermeasures were provided.关键词：Mill Roller;Centrifugal Casting;Defects
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发布时间：2023-12-18 - 摘要：The wire arc additive manufacture（WAAM）of 00 Cr13 Ni5 Mo stainless steel was conducted based on the principle of MIG welding robot technology and rapid prototyping.The microstructure and properties of the WAAMed 00 Cr13 Ni5 Mo deposited layer were investigated by different forming paths and heat treatments.The results show that the number of acicular martensite in 00 Cr13 Ni5 Mo deposited layer in one-type forming path is more than that of ones in zigzag forming path,and grain boundary of austenite in one-type forming path is more obvious than that in zigzag forming path,and ferrites are precipitated from the grain boundary after 1 000℃austenitizing treatment.The shape of the invert austenite in one-type forming path sample exhibits mostly strip and smaller than zigzag forming path sample after 600 ℃ tempering treatment.The micro-hardness of 00 Cr13 Ni5 Mo stainless steel sample reaches400440 HV and tensile strength is more than 1 200 MPa in one-type forming path.The microhardness and tensile strength of the stainless steel in one-type forming path are higher than those of ones at 1 000℃ austenitizing and 600 ℃ tempering treatment,and their are the better than those in zigzag forming path.关键词：Forming Path;Wire Arc Additive Manufacture;00Cr13Ni5Mo;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：SiCp/A356composites with different SiCpmass fraction were prepared by ultrasonic treatment(UT,and effects of SiCpcontent on the microstructure and mechanical properties of the composites were investigated.The results show that the microstructure of A356alloy is composed of coarse primaryα-Al dendrites and long acicular eutectic Si.With the addition of SiCp,the morphology of theα-Al grain is converted from coarse dendrites to rosette crystal uniformly.The microstructure is obviously refined and the eutectic Si becomes gradually shorter.Nano-SiCpis distributed uniformly around the eutectic Si by ultrasonic treatment.The ultimate tensile strength,yield strength and elongation of the 0.5%,1%and2%SiCp/A356nanocomposites are simultaneously improved.Especially,when the SiCpcontent reach to2%,the tensile strength,yield strength and elongation of the composites reach 226MPa,138MPa and5.6%,increased by 19%,51%and 22%,respectively compared with those of the matrix alloy.关键词：Nano-SiCp;Aluminum Matrix Composites;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：SiCpand alloy particles reinforced aluminum matrix composites were fabricated by squeeze casting with alloy particles of Ti-6 Al-l4 Vand Ni60 particles to understand difference of microstructure and mechanical properties.The experimental results show that the addition of Ti-6 Al-l4 Vparticles can improve the mechanical properties of the composites,while Ni60 particles have an opposite effect.Ti-6 Al-l4 Vparticles can realize the desirable interface bonding with the alloy matrix to be subjected to stress in the composites,while Ni60 particles can react sharply with matrix alloy to form a thick intermetallic compound layer,so the loading capacity of the composites is reduced greatly.关键词：Aluminum Matrix Composites;Microstructure;Mechanical Properties;Particle-reinforcement
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发布时间：2023-12-18 - 摘要：The copper-matrix composites reinforced with oxides of Al2O3,SiO2,and MgO,were fabricated by powder metallurgy.The effects of volume fraction of reinforcements on the properties and microstructure of copper-matrix composites were investigated,and the enhancement effect and strengthening mechanism of the different oxide particles in copper matrix were also analyzed.The results show that the hardness of copper matrix composites is increased firstly and then reduced with the increase of reinforcement’s volume fraction.When the volume fraction of oxide particles reaches 2.5%,the hardness of Al2O3/Cu composite and MgO/Cu composites reach 94.4HB and 93.9HB,respectively.And the hardness of Al2O3/Cu composites and MgO/Cu composites are all higher than that of SiO2/Cu composite at the same volume fraction of oxide particles.Microstructure observation shows that the oxides are distributed uniformly and the grains are in alignment in the copper matrix composites in composites with low oxide volume fraction,and the particle reunite phenomenon occurs when the oxide volume fraction increases.The dispersed nanoscale oxide particles in copper matrix and dislocations after hot extrusion can improve mechanical properties of the composite together,which can pin in the crystal and grain boundary and hinder the dislocations movement.The main strengthening mechanisms of the copper matrix composites fabricated by powder metallurgy belong to dislocation strengthening and particle composite strengthening.关键词：Powder Metallurgy;Oxide Reinforcement;Copper-matrix Composites;Physical Properties
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发布时间：2023-12-18 - 摘要：A tensile test was carried out for the extruded AZ31magnesium alloy along extrusion direction at 200400℃and strain rate from 10-4 to 10-2s-1,and the strain hardening rate-stress curves were plotted.The dislocation model of the third stage strain hardening and the relationship of the hardening parameter K1and the softening parameter K2in the model between the deforming temperature and strain rate were investigated.The results reveal that K1is decreased with increasing in temperature and decreasing in strain rate,namely the hardening rate decrease.At 200350℃,the softening rate K2is increased,showing the increase of recovery.However,with temperature increased from 350to 400℃,K2keeps almost constant,which is related to that dislocation annihilation rate has reached a stable state at 350℃because all of the slip systems of the magnesium alloy are in operation at the temperature.关键词：Magnesium Alloys;Third Stage Strain Hardening;Dislocation Model
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发布时间：2023-12-18 - 摘要：The effects of Al content including 80%,60%,40%,20%content on the tribocorrosion properties of Al-Mg2Si composite coating were investigated.The open circuit potential,frictional coefficient,corrosion resistance and tribocorrosion behaviors of the coatings prepared were characterized by scanning electron microscopy,electrochemical testing,reciprocating-sliding tribometer and ultra-depth three-dimensional microscope.The results reveal that the potential of Al-Mg2Si coating is the higher than that of AZ31B magnesium alloy,and with decreasing in the content of Al,the potential shift is increased.The positive displacement of Al-80Mg2Si coating is the most,which is shifted 0.528 8V,and the corrosion current density is 3.298×10-3 mA/cm2.Furthermore,with decreasing in Al addition,the wear rate and friction coefficient of the coating are decreased.The wear rate and friction coefficient reach4.27×10-3 mm3/（N獉mm）and 0.78,respectively,with 20%Al content.关键词：AZ31B Mg Alloy;Flame Spraying;Al-Mg2Si Coating;Tribocorrosion
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发布时间：2023-12-18 - 摘要：By measuring and analyzing the microhardness of ZL205 Aalloy at different vertical depths from the end face of the ultrasonic horn at different pulse ultrasonic power,the effects of pulsed ultrasonic power on microhardness of different parts were analyzed.The relationship between the microhardness of ZL205 Aalloy and the pulse ultrasonic power as well as depth was established.The results reveal that the microhardness is increased firstly and then decreased with the increase of the pulse ultrasonic power at the same distance from the end face of the ultrasonic horn.Under the same pulsed ultrasonic power condition,the microhardness of ZL205 Aalloy is decreased firstly and then increased with the increase of the depth of vertical zone.The maximum microhardness of the alloy samples can be observed at0 mm in depth with power of 600 W,while the core area of the alloy sample belongs to microhardness weak zone after ultrasonic vibration.关键词：ZL205A Aluminum Alloy;Pulsed Ultrasonic Vibration System;Microhardness;Refinement Depth
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发布时间：2023-12-18 - 摘要：Al-20 Si functionally gradient materials under pulsed magnetic field was fabricted.Effects of pulse voltage,pulse frequency,mold temperature and pouring temperature on the morphology and distribution of primary silicon in the Al-20 Si gradient alloy were investigated.The results reveal that Al-20 Si functionally gradient material can be prepared successfully by pulsed magnetic field.Primary silicon is segregated in the edge,and it is absent in the center position.In the range of 0150 V,with the increase of the pulse voltage,morphology of primary silicon is changed from small blocks to large lath shape,and the average distribution width is decreased gradually.In the range of 110 Hz,the average distribution width of primary silicon is decreased with the increase of pulse frequency.When the pouring temperature is at 690780℃ or mold temperature is at 400700℃,with the increase of pouring temperature or mold temperature,the average width of primary silicon is decreased at first and then increased.关键词：Pulsed Magnetic Field;Al-20Si Alloy;Primary Silicon;Gradient Material
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发布时间：2023-12-18 - 摘要：Tensile tests for 2524aluminum alloy sheet were carried out at 250450℃and 10-110-4s-1.The effects of thermal deformation parameters on microstructure and mechanical properties of 2524alloy were investigated.The results reveal that the alloy begins to exhibit dynamic recrystallization characteristics at 300℃under strain rate of 10-3s-1.With increasing in temperature and decreasing in strain rate,dynamic recrystallization more easily appears.When the temperature is 250℃and the strain rate is10-1s-1,the tensile strength reaches maximum value of 312MPa,and the elongation reaches minimum value of 13%.At 250℃,the tensile strength is decreases by 42.9%and the elongation is increases by15.4%with the decrease of strain rate.At 10-1s-1,the tensile strength is decreases by 77.2%and the elongation is increases by 285%with the increase of temperature.The fracture is characterized by ductile fracture.关键词：2524Aluminum Alloy;Strain Rate;Temperature;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The influences of multi-stage aging treatment on microstructures,electrical conductivity and hardness of Cu-Cr-Zr-Co-Si alloys were investigated by using optical microscopy（OM）,eddy current device and micro-hardness test,which was compared with those of ones with single-stage aging treatment.The results show that the multi-stage aging can promote the precipitation in Cu-Cr-Zr-Co-Si alloys and precipitates are more dispersive and uniform than those in alloys treated by single step aging.The effects of multi-stage aging on the electrical conductivity of Cu-Cr-Zr-Co-Si alloy can be ignored,however,it can improve significantly the hardness of the alloy.The secondary aging temperature in the multi-stage aging treatment process has an important effect on the final properties of the alloy.关键词：Cu-Cr-Zr-Co-Si Alloy;Multi-stage Aging;Microhardness;Electrical Conductivity
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发布时间：2023-12-18
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