最新刊期
卷 42 ， 期 7 ， 2022
- 摘要：Effects of ultrasonic treatment on solidification structure and degassing of DC casting 7005 aluminum alloys were investigated. The results reveal that ultrasonic treatment can refine the solidification structure. The size of grain at the edge is decreased from 200 μm to 100 μm, while that of R/2 grain is decreased from 120 μm to 100 μm, and that of center grain is decreased from 100 μm to 80 μm, indicating the desirable refinement of the edge. Inserting depth of ultrasonic probe has important effect on grain refinement, and the hydrogen content in DC casting is decreased by 26.8% after ultrasonic treatment, showing that ultrasonic has desirable refinement and degassing effect on DC casting aluminum alloy.关键词：7005 Aluminum Alloy;DC Casting;Ultrasonic Field;Grain Refinement;Degassing
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发布时间：2024-02-28 - 摘要：Numerical simulation was utilized to investigate the influence of different centrifugal casting methods on TiAl alloy turbocharger forming, and the formation of TiAl alloy turbocharger with centrifugal top injection, centrifugal side injection and centrifugal bottom injection was analyzed according to the melt filling characteristics and melt filling temperature. The results indicate that centrifugal top injection has a better melt filling stability, and gas is discharged completely from the turbocharger cavity, and temperature decrease is less during filling, which is the most conducive to the formation of TiAl alloy turbocharger. The melt filling stability of centrifugal side injection also has a better melt filling stability, however, the gas is vented to the tip of the blade where the vent is difficult to open, meanwhile the melt temperature is lower at the last filling position, and the melt filling temperature difference between different blades is high, which is not conducive to TiAl alloy turbocharger formation. The centrifugal bottom injection has desirable melt filling stability, and the gas is discharged to the top of the turbocharger where the vent is easy to open, and the melt filling temperature is lower while the temperature difference between different blades is slight, which is suitable for TiAl alloy turbocharger formation under higher pouring temperature or shell preheating temperature. Well-formed TiAl alloy turbochargers were manufactured by actual casting test with centrifugal top injection.关键词：TiAl Alloy;Turbocharger;Centrifugal Casting;Numerical Simulation
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发布时间：2024-02-28 - 摘要：Pure tungsten and tungsten copper composites were fabricated by laser additive manufacturing. The surface morphology, microstructure and hardness were characterized by optical microscopy, scanning electron microscope and Vickers hardness tester. The influence of parameters, including powder characteristics, laser power, scanning speed and layer thickness on the microstructure and mechanical properties of pure tungsten parts, as well as the interface bonding of tungsten copper composites were systematically analyzed. Pure tungsten parts with relative density up to 97.66% and hardness up to 486.23 HV were produced, and tungsten copper composites with desirable interface bonding were obtained by optimizing the processing parameters.关键词：Laser Additive Manufacturing;Pure Tungsten;Tungsten Copper Composites;Microstructure;Properties
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发布时间：2024-02-28 - 摘要：The morphologies of directionally solidified nickel-based superalloy after heat treatment and damage mechanism of the alloy at 760 ℃ and 700 MPa for different creep duration were investigated by creep property test and microstructure observation. The results reveal that after heat treatment, the sizes of γ′ phases between interdendritic region and dendrite arms are greatly different, where the coarse and fine γ′ phase exist in interdendritic and dendrite arm region, respectively. The cubic γ′ phase does not form raft structure after the alloy creep rupture at 760 ℃ and 700 MPa, and the closer to the fracture area, the more severe γ′phase distortion, which is attributed to the necking to a greater extent at the fracture during the creep. In the later stage, cracks in the alloy are firstly initiated and propagated at grain boundary and eutectic structure that is not eliminated, where the grain boundary at a 45 angle to the stress axis suffers the higher shear stress, enhancing creep damage probability.关键词：Directionally Solidified Nickel-based Superalloy;Creep;Grain Boundary;Crack Initiation and Propagation
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发布时间：2024-02-28 - 摘要：Taking the dynamic characteristic（force and vibration acceleration） of the spindle during the friction stir welding process as input parameters, and tensile strength of the joint as output parameters, a genetic algorithm BP neural network model with 4×8×13×1 four-layer topology was established to predict the mechanical properties of 1060 Al/AZ31 B Mg dissimilar metals friction stir butt welding joints.37 and 8 groups of sample data were selected respectively to train and test the model. The results reveal that the average relative errors between the predicted values and the measured values of the training samples and the test samples are within the acceptable range, which are 4.1% and 5.4%, respectively, indicating the high prediction accuracy of the model.关键词：FSW;Dynamic Characteristic;Genetic Algorithm;BP Neural Network;Mechanical Properties
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发布时间：2024-02-28 - 摘要：Aiming at the problems of cumbersome operation, poor real-time performance, and error-prone calculations in the manual mode of the metal smelting furnace, an integrated feeding scheme including spectral data integration, batching calculation, information display, and weighing instructions was proposed. Firstly, rapid data collection was achieved based on the XML middleware data integration technology, and a low-cost batching calculation model was established.Secondly, information display and weighing instructions were realized on account of PLC. Finally, an integrated feeding system before the furnace was designed based on the InteCast ERP, which was applied to small and medium-sized enterprises. The results indicate that the integrated system is more convenient to operate, and charging calculation is reduced to the second level, which can significantly improve the feeding efficiency.关键词：Metal Smelting;Data Integration;Charge Ratio;Integrated System
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发布时间：2024-02-28 - 摘要：The casting process for the shell-pressing was designed, simulated and optimized. Two kinds of gating systems were initially designed. ProCAST software was used to simulate the filling process, defect distribution and process improvement. According to the simulated results, the mid-pouring gating system was adopted. The simulated results reveal that the process of the mid-pouring gating system is completed after 3.99 s. Shrinkage holes and porosity defects at the bottom of the flange and the core of the casting can be observed, which are mainly related to the uneven distribution of the solidification field and the failure to obtain timely feeding. The process needed to be further optimized. An open riser is set at the flange of the casting for feeding, and three heating risers are used to improve the temperature field. In the final simulation results, the optimized process significantly improves the temperature field distribution, adjusts the solidification sequence and reduces defects, ensuring a higher process yield rate of castings.关键词：Shell-pressing;Casting Process Design;Casting Process Simulation;Optimization
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发布时间：2024-02-28 - 摘要：The unidirectional compression deformation of SiCp/AZ91 magnesium matrix composites was carried out by Gleeble-3800 thermal simulation testing machine under the deformation temperature of 250 ℃～400 ℃ and the strain rate of 0.001 s-1～1 s-1. The microstructure evolution during the deformation process was observed and the high temperature deformation mechanism of SiCp/AZ91 magnesium matrix composites was revealed. The results indicate that there are only Mg phase and SiC phase in as-cast SiCp/AZ91 magnesium matrix composites. When the strain rate is 0.001 s-1, composites are partially recrystallized at 250 ℃, which are fully recrystallized at 350 ℃. When the compression temperature is increased to 400 ℃, the recrystallized grains grow rapidly. The reduction of strain rate is beneficial to dynamic recrystallization of SiCp/AZ91 magnesium matrix composites at 250 ℃ and 350 ℃, where the stress factor is 5, the true activation energy Q is 91 kJ/mol, and the deformation mechanism is dislocation climbing controlled by grain boundary diffusion.关键词：SiCp/AZ91 Magnesium Matrix Composites;High Temperature Compression;Deformation Temperature;Strain Rate;Microstructure
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发布时间：2024-02-28 - 摘要：The TiB2 p reinforced Fe-Cr matrix composites were prepared by in-situ synthesis method. The microstructure and high temperature oxidation behavior of both the composites were analyzed by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and energy dispersive spectrometer（EDS）. The results indicate that excessive Ti（6%） can effectively eliminate（Fe, Cr）2B mesophases, and the morphology of TiB2 particles is converted from petal to regular polygon, where the microhardness is increased greatly from 400 HV0.5 to 860 HV0.5, and the fracture toughness is enhanced from 2.91 MPa·m1/2 to 5.47 MPa·m1/2. However, the interface between coarse primary TiB2 particles and matrix provide oxygen diffusion channel and the original two-layer structure of oxide layer（rutile TiO2 outer layer+compact Cr2O3 inner layer） is transformed into three-layer structure（rutile TiO2 outer layer+compact Cr2O3 transition layer+TiO2 inner layer）, resulting in a significant decrease in oxidation resistance at 900 ℃, where the oxidation gain rate is increased by 307.4%.关键词：Particle Reinforced Composite;TiB2;In-situ Synthesis;High-temperature Oxidation
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发布时间：2024-02-28 - 摘要：Cu matrix composites with Y2O3 volume fraction of 7% were successfully prepared by liquid phase in situ reactive ball milling and spark plasma sintering（SPS） technique. The effects of ball/material ratio on the microstructure and properties of Y2O3/Cu composites were investigated by XRD, OM, SEM, universal tensile testing machine, hardness tester and eddy current conductivity meter. The results reveal that with the increase of ball/material ratio, the mechanical performance of in-situ 7 Y2O3/Cu composites is improved gradually, while the conductivity is decreased slightly, with relative density kept above 97%, achieving basical density. The microstructure indicates that the enhanced phase Y2O3 particles are mainly spherical and the size is between 200 nm and 500 nm. With the increase of ball/material ratio, the second phase particles are more evenly distributed in the copper matrix. The fracture mechanism presents a typical plastic fracture, and Y2O3 particles are obviously distributed in the dimples.关键词：Y2O3/Cu Composites;Ball/Material Ratio;In-situ Reactive Ball Milling;SPS
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发布时间：2024-02-28 - 摘要：The CuSn10 P1 alloy semi-solid slurry was prepared by the melt-constrained flow-induced nucleation device, and the semi-solid rheological extrusion test was carried out on a hydraulic press using a self-designed mold. The influence of the ingate length on the microstructure and mechanical properties of semi-solid rheological extrusions was investigated. The results show that as the length of the sprue increases, the uniformity of the structure is increased at first and then decreased, which presents desirable when the length of the sprue is 20 mm. When the length of the ingate reaches above 30 mm, there is an obvious solid-liquid separation phenomenon. As the length of the ingate increases, the tensile strength and elongation are increased at first and then decreased. When the length of the ingate is 20 mm, the tensile strength and plasticity of the casting are satisfied.关键词：Cu-Sn Alloy;Semi-solid;Uniformity of Structure;Mechanical Properties
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发布时间：2024-02-28 - 摘要：High-entropy alloys（HEAs） have been the focus of research in academia and industry due to the excellent mechanical and electrochemical properties. Coatings with special functions can be cladded on the substrate surface by laser cladding, making single material become functional gradient composite. HEAs coating on the surface can significantly improve the surface hardness, high-temperature mechanical properties and corrosion resistance of the material, prolonging the service life. The effects of alloy composition and content on the hardness, wear resistance and corrosion resistance of laser cladding HEAs coatings as well as the mechanism were reviewed.The challenges of laser cladding HEAs coatings were summarized, and the application as well as development direction of laser cladding HEAs coatings was prospected.
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发布时间：2024-02-28 - 摘要：The effects of Sr on the microstructure and mechanical properties of hypereutectic Al-Mg2Si alloy were investigated. The results indicate that Sr has effects on both primary Mg2Si phase and eutectic Mg2Si phase in Mg2Si reinforced aluminum alloy. After Sr addition, the morphology of the primary Mg2Si phase is transformed from coarse dendritic to quadrilateral shape. Meanwhile, the morphology of eutectic Mg2Si phase is transformed from long rod-like to fine rod-like and granular. When Sr content is 0.1%, the modification effect is desirable, and the primary Mg2Si phase is tiny and evenly distributed. The tensile strength of the alloy is 121 MPa, which is increased by 55.1% compared with the unmodified alloy with slight elongation change. When the addition amount of Sr reaches 0.15%, the primary Mg2Si is coarsened again, and over-metamorphism occurs, resulting in the degradation of mechanical properties.关键词：Al-20Mg2Si Aluminum Alloy;Primary Mg2Si;Sr Modification;Mechanical Properties
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发布时间：2024-02-28 - 摘要：The effects of Mn and Zr microalloying on microstructure and properties of Al-10 Mg aluminum alloy were investiagted by adding trace Mn and Zr. The results reveal that the as-cast average grain size of Al-10 Mg alloy with 0.4% Mn reaches 108 μm, and the tensile strength, yield strength and elongation reach up to 361 MPa, 183 MPa and 17.99%, respectively, after solution treatment at 435 ℃ for 16 h. With 0.4% Mn and 0.1% Zr addition, the average grain size of the alloy reaches up to 84 μm. After solution treatment, the tensile strength, yield strength and elongation of the alloy reach up to 381 MPa, 187 MPa and 20.00%, respectively.关键词：Al-10Mg Alloy;Microalloying;Mechanical Properties;Fracture
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发布时间：2024-02-28 - 摘要：The effects of eutectic Si agglomeration on mechanical properties and corrosion resistance of squeeze casting Al-Si-Mg alloy were investigated. The results reveal that the squeeze casting Al-Si-Mg alloy presents the eutectic Si agglomeration, which keeps after solid solution treatment and has adverse effects on the mechanical properties and corrosion resistance of the alloy. Corrosion test results reveal that after T6 heat treatment, the sample with eutectic Si aggregation has a corrosion potential of-820 mV and a corrosion current density of 1.91×10-5 A/cm~2, and that with uniform eutectic Si distribution has a corrosion potential of-790 mV and a corrosion current density of 1.08×10-5 A/cm~2. The corrosion cracks can be observed along the region where Si phase is aggregated. The sample with uniform eutectic Si distribution has better corrosion resistance. For mechanical properties, the agglomeration of eutectic Si has an adverse effect on the elongation of the alloy after T6 heat treatment. When the eutectic Si distribution is relatively uniform, the elongation and the tensile strength as well as the yield strength of the alloy reach up to 14.12%, 332 MPa, and 271 MPa, respectively. When the eutectic Si phase is agglomerated and unevenly distributed, the elongation and the tensile strength as well as yield strength of the alloy reach 10.12%, 324 MPa and 259 MPa, respectively.关键词：Squeeze Casting;Al-Si-Mg Alloy;Eutectic Si;Mechanical Properties;Corrosion Resistance
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发布时间：2024-02-28 - 摘要：The effects of different contents of rare earth Er on the microstructure and properties of Al-7 Si-0.6 Mg aluminum alloy were investigated by scanning electron microscopy（SEM）, energy dispersive spectrometer（EDS）, X-ray diffraction（XRD） and transmission electron microscopy（TEM）. The results indicate that the alloy is mainly composed of α-Al, eutectic Si, AlEr2Si2 and iron-rich phases（π-AlSiMgFe and β-AlSiFe）. Rare earth Er is an excellent modifier that can obviously improve the microstructure of Al-7 Si-0.6 Mg aluminum alloy. The addition of Er not only refines the primary α-Al phase in the alloy, but also modifies the eutectic silicon.When the addition of rare earth Er is 0.1%, the refinement and modification effect is desirable, where the primary phase α-Al dendrite spacing is decreased, the coarse dendrite is gradually refined, and the eutectic Si is evolved from acicular to short rod. Compared with the one without rare earth addition, the hardness of the alloy with 0.1% Er addition is increased by 23.2%, and the elongation and tensile strength reach 4% and 293 MPa, respectively.关键词：Al-7Si-0.6Mg Aluminum Alloy;Er;Microstructure;Mechanical Properties
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发布时间：2024-02-28 - 摘要：Diffusion bonding behavior and mechanism of 2 A12 aluminum alloy were investigated by diffusion bonding method in order to achieve the seamless construction of large section aluminum alloy. The interfacial healing experiments were carried out at 530, 540, 550 and 560 ℃, respectively, for 3 h and 5 MPa. The results indicate that with temperature increasing, large quantities of the second phase are dissolved and the micro zone suffers plastic deformation. The eutectic liquid phase breaks the oxide film and fills the micropores, where the internally decomposed oxide is dissolved into the matrix, and that at the edge is extruded by pressure. Grain boundary migration occurs in large quantities, and recrystallization regions appear on both sides of the interface. The dimension and distribution of recrystallized grains become more uniform with the increase of temperature, where the interface strength reaches the maximum of 318 MPa at 560 ℃.关键词：2A12 Aluminum Alloy;Interfacial Healing;Eutectic Liquid Phase;Recrystallization
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发布时间：2024-02-28 - 摘要：The effects of single stage annealing temperature 425 ℃、450 ℃、475 ℃、500 ℃（holding time of 15 h） on the microstructure and mechanical properties of high purity aluminum foil were investigated by EBSD technique, and the cubic texture content, grain orientation, grain size and orientation difference distribution of aluminum foil after annealing were analyzed emphatically. The results show that the microstructure of high purity aluminum foil under four annealing processes is all cubic oriented grains with the strength of cubic texture over 98%, and the misorientation direction tends to the direction of low misorientation angle. In addition, the average grain size of aluminum foil reaches 70～95 μm, and the proportion of grains in the range of 60～200 μm reaches 50%, where the tensile strength can reach 28～31 MPa, and the fracture mode is characterized by cleavage fracture.关键词：Annealing Temperature;Microstructure;Cube Texture;Mechanical Properties
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发布时间：2024-02-28 - 摘要：The effects of single stage annealing temperature at 425, 450, 475, 500 ℃ for 15 h on recrystallized cube texture and subsequent corrosion performance of electronic aluminum foil were investigated by EBSD technology and fast-speed electronic aluminum foil corrosion process. The results indicate that recrystallized texture of electronic aluminum foil is almost cube texture under all annealing processes.With the increase of annealing temperature, the average grain size and oxide film thickness of aluminum foil is increased gradually. When the annealing temperature is 450 ℃, the performance of corrosion foil is desirable, where the specific capacitance is 0.773 μF/cm~2, the number of bend is 56 cycles, and the weight loss rate is 30.82%.关键词：Annealing Temperature;Cube Texture;Corrosion Properties
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发布时间：2024-02-28 - 摘要：The influence of pouring temperature on the corrosion resistance of Al-4.5 Mg-3 Si alloy was investigated by electrochemical work station, scanning electron microscope, X-ray diffraction and laser scanning confocal microscope. The results indicate that the corrosion resistance of Al-4.5 Mg-3 Si alloy tends to be increased with the decrease of pouring temperature. The corrosion potential of Al-4.5 Mg-3 Si alloy is increased from-1.324 1 V to-1.215 2 V, and the corrosion current density is decreased from 1.531 4×10-5 A/cm~2to 1.272 6×10-5 A/cm~2. Meanwhile, the corrosion rate is the lowest at 720 ℃, which is 14.00% of that of ones at 760 ℃, and the weight loss rate of alloy is decreased from 0.174 1 g to 0.027 0 g, which is 15.50% of that of ones at 760 ℃.关键词：Al-4.5Mg-3Si;Corrosion Resistance;Pouring Temperature;Mg2Si
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发布时间：2024-02-28 - 摘要：Through the secondary development of the Flow-3 D software, the numerical simulation of the three-dimensional multi-pass selective laser melting（SLM） process was realized. The velocity field, temperature field and morphological characteristics of the molten pool were analyzed and compared with the simulation results of the finite element method and the smooth particle hydrodynamics method. The effects of different laser power on the depth and width of the molten pool were also investigated. The results indicate that the simulation of temperature field in the SLM process by secondary-developed Flow-3 D software present accurate. Marangoni convection plays an important role in the formation of the molten pool morphology during the SLM process, and the length and width of the molten pool is increased with laser power increase.关键词：Selective Laser Melting;316L Stainless Steel;Numerical Simulation
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发布时间：2024-02-28 - 摘要：The effects of different pulsed magnetic field parameters on the solidification microstructure and mechanical properties of Mg-Zn-Zr-Gd alloy were investigated.The results reveal that the solidification microstructure and mechanical properties of the alloy are obviously improved under the condition of pulsed magnetic field. With the increase of pulsed voltage（0～300 V） or mould preheating temperature（200～600 ℃）, the grain size in the alloy is decreased gradually. With the increase of pulsed frequency（0～10 Hz）, the grain size of the alloy is decreased firstly and then increased. With the pulsed voltage of 300 V, the pulsed frequency of 5 Hz and the mould preheating temperature of 600 ℃, the mechanical properties of the alloy present desirable, where the compressive strength and the compression rate of the alloy reach 271.35 MPa and 22.5%, resepctively. Compared with those of the alloy without pulsed magnetic field treatment, the compressive strength and compression rate of treated alloy are increased by 28.4% and 14.2%, respectively.关键词：Pulsed Magnetic Field;Mg-Zn-Zr-Gd Alloys;Solidification Microstructure;Mechanical Properties
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发布时间：2024-02-28 - 摘要：The microstructure and properties of ZG40Cr25Ni20steel with 5%Al,0.6%Ti and 0.6%W after solution treatment were investigated.The results indicate that the tensile strength of ZG40Cr25Ni20is increased with the addition of alloying elements,and the elongation is decreased to about 11%of the ones before addition,which presents brittle fracture.However,the high temperature elongation is increased significantly with many dimples and tearing edges existing on the tensile fracture surface,and high toughness at high temperature is presented.With the addition of Al,Ti and W elements,after 1 200℃×5hoil cooled,the hardness is increased further due to the formation of Ni3Al phase and TiC and WC particles with high hardness and high stability,where the wearresistance at room temperature and 600℃dry friction condition are improved.关键词：ZG40Cr25Ni20;Alloying;Solution Treatment Microstructures;Hardness;Wear-resistance
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发布时间：2024-02-28 - 摘要：The phase transition of Ti-22 Al-27 Nb alloy induced by laser shock peening（LSP） was investigated, and the influence law of LSP parameters on the microstructure transformation was analyzed. The results indicate that the transition from B2 phase to O phase is increased with the increase of laser energy, laser overlapping ratio and impact times, and the surface microhardness as well as the depth of affected layer are also increased.The impact times have great effects on the transformation of O phase. When the impact times is increased from 3 to 7, the content of O phase near the surface is increased from 21.63% to 25.66% compared with the matrix. The LSP induces significant plastic deformation and introduces dislocation defects, leading to an increase in adiabatic temperature, which promotes the transition from B2 to O phase.关键词：Laser Shock Peening;Ti-22Al-27Nb Alloy;Phase Transition
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发布时间：2024-02-28 - 摘要：Through structure analysis of body and cover of gearbox, all-metal mold gravity casting process was selected to determine the appropriate process and metal mold parameters based on riser design theory of “shrinkage pipe method” and metal mold design theory of “temperature equalization method”. In view of the problems existing in the design and production of gearbox castings, solutions were put forward to realize the normal production of castings. Compared with sand mold casting and metal mold casting with sand core, all-metal mold casting has superior advantages for thin-wall aluminum alloy castings.关键词：Metal Mold Casting;Gearbox Body;Thin-wall Aluminum Alloy Castings
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发布时间：2024-02-28 - 摘要：Aluminum alloy main bearing cap of engine block was produced by semi-solid rheological die casting. Compared with QT500-7 products, weight is reduced by 45%, presenting the remarkable lightweight effect, and the performance of the parts meets the design requirements. The main bearing cap was redesigned and optimized according to the properties of the semi-solid aluminum alloy 319 S and the characteristics of the SSM. After the three-stage heat treatment, the metallographic structure is fine with high mechanical properties and absence of defects such as gas hole and shrinkage porosity. The aluminum alloy parts have passed 10 million single-frame fatigue tests, showing good application prospects.关键词：Semi-solid Die Casting;Main Bearing Cap;Aluminum Alloy;Lightweight
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发布时间：2024-02-28 -
Microstructure and Properties of Low-pressure Turbine Blade of K465 Alloy after Thermal Fatigue Test
摘要：Through the test at 900 ℃ and 950 ℃ for 100 cooling/heating cycles on the low-pressure turbine blade of K465 alloy an aeroengine, the crack initiation and propagation of the blade during the thermal fatigue test were investigated, and the microstructure and mechanical properties of the blade after thermal fatigue test were analyzed. The results indicate that the thermal fatigue crack is firstly originated from the process hole of the blade and extends perpendicularly to the axial direction of the blade. The stress concentration on the process hole and shrinkage is the main reason for the thermal fatigue crack initiation. After the cooling/heating cycle test, the dimension of γ′ phase in the dendrite arm is increased, and the edges and corners of cubic γ′ phase become smooth and irregular. Due to the precipitation of accicular secondary phase, the elongation of blade is decreased significantly.关键词：K465 Alloy;Thermal Fatigue;Crack;Microstructure;Performance- 2
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发布时间：2024-02-28
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