最新刊期
卷 35 ， 期 5 ， 2015
- 摘要：The morphology ofβ-Mg17Al12 phase and mechanical properties of as-cast AZ80 magnesium alloy after spheroidizing treatment were investigated by means of optical microscope（OM）,field emission scanning electron microscopy（FESEM）,X-ray diffraction（XRD）,hardness and tensile testing.The results reveal that the coarse divorced eutectic phase β-Mg17Al12 phase in the AZ80 cast magnesium alloy is fully dissolved into Mg matrix during isothermal process at 415℃,and the perlite-type lamellerβphase with dense structure is precipitated from magnesium solid solution during the slow cooling.And then,the spheroidizing treatment was carried out,and the lamellerβphase was spheroridized by dissolved themselves.With the increase of spheroidizing time,the lamellarβphase began to fusing to generate short rod firstly,then transform to spheroidization.After spheroidizing treatment at 320 ℃ for 16 h,lots of small granularβphases are distributed dispersedly in the magnesium matrix.However,when the spheroidizing time is further increased,dissolution of the granularβphase appears in the alloy,and the number ofβphase is reduced.And after spheroidizing treatment at 320℃ for 16 h,yield strength,tensile strength and elongation of AZ80 magnesium alloy reach 132.5MPa,252.4MPa and 9.56%,respectively.The brinell hardness of the alloy are increased firstly,and then declined with prolongation of spheroidizing time,however,the hardness value is higher than that of the as-cast alloy.关键词：Spheroidizing Time;AZ80Magnesium Alloy;β-Mg17Al12Phase;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The Al2（1-x）MgxTi1+xO5 solid solution ceramics were prepared by gelcasting withα-Al2O3,rutile-TiO2 and MgO as the raw powder.Samples prepared were soaked in the aluminum melt at 750℃ for 20min,and then cooled with water.The residual strength of the samples after five thermal shock was tested.Influence of xvalues on the thermal shock resistance of the solid solution was investigated.The results indicate that with the increase of xvalues,the thermal shock resistance is increased quickly firstly and then slowly.When xvalue is 0.15,the strength retention rate of the samples prepared keeps 87% after 5 thermal shock,showing excellent thermal shock resistance.关键词：Aluminium Titanate;Magnesium Oxide;Solid Solution;Gelcasting;Thermal Shock Resistance
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发布时间：2023-12-18 - 摘要：By using argon blowing addition method,nanometer TiN and SiC particles as additive was added into the wear-resistant steel,and microstructure and performance of the wear-resistant steel with nano-TiN and SiC particles modifier were analyzed.Meanwhile,the existing form and mechanism of Nano-TiN and SiC particles in the wear resistant steel were expounded.The results show that nano-TiN and SiC can refine the grains and play precipitation strengthening effect in the wear-resistant cast steel to improve wear resistance.TiN exists in the matrix in form of micron agglomerated particles and dispersed nano second phase particles,while SiC mainly exists in form of nano-oxide in the matrix.The wear morphology of cast steel with nano TiN is mainly characterized by shallow furrow,and the wear morphology of cast steel with nano SiC is mainly characterized by local spalling.In addition,wear morphology of initial cast steel mainly exist in form of mixed furrow and spalling.关键词：Nanometer Tin;Nanometer SiC;Existing Form;Wear Resistance
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发布时间：2023-12-18 -
Properties and Microstructure of Rheological Squeeze Casting Aluminum Alloy under Different Pressure
摘要：ZL111 aluminum alloy brake pump cylinder was produced by rheological indirect squeeze casting.Influence of injection specific pressure on the quality of brake pump cylinder was analyzed by X-ray detection,metallographic analysis and tensile test,TEM.The results reveal that with the increase of the injection specific pressure,the shrinkage porosities in casting are eliminated.With the injection specific pressure increased from 80 MPa to 95 MPa,the average grain size is decreased from 149μm to 99μm,and tensile strength and elongation of castings reach 371 MPa and 3.17%,respectively.关键词：Semi-solid;Squeeze Casting;ZL111Aluminum Alloy;Brake Pump Cylinder;Injection Specif-ic Pressure- 2
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发布时间：2023-12-18 - 摘要：Chemical composition,thermal diffusion coefficient and density of Mg-RE series,AZ91 Dand ADC12alloy were measured at ambient temperature,meanwhile,the specific thermal capacity and thermal conductivity of the alloys were calculated based on the NKR standard.The results reveal that regardless of room temperature or high temperature,the Mg-RE alloy exhibits satisfied tensile properties.At 250 ℃,the tensile strength,thermal conductivity and thermal capacity of Mg-RE alloy reach 154 MPa,101 W/（m·K）and 1.778J/（cm3·K）,increased by 71%,40% and decreased by 7.0%,respectively,compared with those of AZ91 Dalloy.During temperature measuring process,the increment-temperature and decrement-temperature rate are the fastest,and heat transferring during balance process is the most,showing desirable dissipation ability of Mg-RE alloy.关键词：Rare Earth Magnesium Alloy;Heat Dissipation;Heat Resistance;Thermal Conductivity;Ele-vated Mechanical Properties
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发布时间：2023-12-18 - 摘要：The multi-directional forging with mould was designed based on the traditional multi-directional forging for wrought high-performance 7075 aluminum alloy.The metal flow,pressing load and the effective strain distribution were analyzed comparatively,and the microstructure and uniformity of 7075 aluminum alloy after deformation were predicted in two kinds of processes by simulation method.It is concluded that compared with the traditional multi-directional forging,the multi-directional forging with mould can take ignore change of the shape and size of the billet after several pass deformation,and also the velocity of the metal flow is increased and the distribution tends to be more uniform in filling stage.Meanwhile,it can take the grain refinement and microstructure uniformity to a certain extent.The new process has obvious advantages in improving the quality of billet and material utilization.关键词：Multi-directional Forging;7075Aluminum Alloy;Mould;Grain Refinement;Uniformity
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发布时间：2023-12-18 - 摘要：Aiming at easily damaged parts of blast furnace tuyere,flow field and temperature field of blast furnace tuyere were simulated by the Fluent software.The results show that when the inlet water speed is 8m/s,cooling effect exhibits desirable.If the inlet water speed is more than 8m/s,cooling effects is further improved slightly,however,pressure loss is enlarged sharply.When impurity content in the cooling water is much,a similar thermal barrier layer of scale can be formed to affect greatly the temperature of tuyere.Simulated results reveal that when the scale of the thickness is more than 0.4 mm,tuyere temperature is more than the allowable temperature of pure copper tuyere,resulting in the damage of tuyere.关键词：Furnace Tuyere;Numerical Simulation;Temperature Field
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发布时间：2023-12-18 - 摘要：Aiming at the high energy consumption of traditional production process of ESR system,vibrating electrode remelting method was proposed to improve the melting rate.Based on the experimental data of vibrating electrode method,a model was built up on the basis of a theoretical research of partial least-squares regression spline transformation.Compared with no vibration,the simulation result reveals that the method can improve effectively the melting rate,and prove the validity of the model.关键词：Electroslag Remelting;Vibrating Electrode;Spline Transformation;Partial Least Squares
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发布时间：2023-12-18 - 摘要：The technical progress in the recycling of aluminum and its alloys scrap chips were reviewed.Firstly,the remelting refining processes were introduced briefly;Secondly,a hot extrusion direct recycling process was described in detail.Furthermore,manufacturing technology and properties of composites fabricated by hot extrusion were expounded comprehensively.关键词：Scrap Chips;Remelting;Solid-state Recycling;Hot Extrusion;Composites
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发布时间：2023-12-18 - 摘要：Melt mixing treatment process has the characteristic of simple technology and low-cost as well as small negative effect on the environment,provided a new idea to optimize the solidification structure of Al-Si alloys.Melt mixing treatment process has been briefly introduced.The progress was reviewed,including the solidification structure of Al-Si alloys,the distribution and morphology of primary phase.The mechanism of melt mixing treatment on optimizing the solidification was summarized.The reason of melt mixing treatment difficult to industrial production was analyzed.关键词：Melt Mixing Treatment Process;Al-Si Alloys;Optimizing of Solidification Structure
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发布时间：2023-12-18 - 摘要：The semi-solid thixo-extrusion ZCuSn10 copper alloy prepared by strain induced melt activated（SIMA）method with cold rolling and remelting was carried out.The semi-solid extrusion formability of ZCuSn10 copper alloy was described through the analysis of microstructure evolution.The results indicate that microstructure of ZCuSn10 alloy billets by SIMA method with cold rolling and remelting exhibits uniform,fine particles.The extrusion part with surface finish,fine and homogeneous microstructure can be obtained at 960 ℃for 25 min.关键词：ZCuSn10Copper Alloy;Semi-Solid Thixo Extrusion;Remelting Temperature;Semi-Solid Mi-crostructure
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发布时间：2023-12-18 - 摘要：Al-4Cu（mass fraction,%）alloy billets were prepared by electromagnetic stirring,and reheating melting experiment was carried out.The distribution of Cu elements was analyzed in the alloy billets at as-cast,electromagnetic stirring and reheating melting condition,respectively.The results show that Cu element is segregated at the grain boundaries after electromagnetic stirring,especially at grain boundary junction.The number of precipitated Cu-contained compounds is less than that in the grains without electromagnetic stirring.With the increase of the magnetic field strength,segregation of Cu element becomes more serious increasingly,and the segregation of Cu element is increased from the surface to the core at radial direction of cylindrical billet.Reheating melting can change the distribution of Cu element in the semi-solid billet,in which the degree of change is relevant to the fraction of remelting liquid volume.When the volume of remelting liquid is low,Cu elements still enrich in the non-remelting solid phases,while the distribution of Cu element will be uniform at the remelting zone.Reheating melting eventually enlarge the differences of Cu average content at remelting and non remelting zone.关键词：Semi-solid Process;Al-Cu Alloy;Element Segregation;Grain
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发布时间：2023-12-18 - 摘要：Effects of some factors such as the superheat of molten steel,casting speed and the size of steel strip on feeding speed were investigated.The results reveal that the feeding speed is increased with increasing in casting velocity,and the optimized casting velocity and over-heating temperature of the liquid steel are 1.21.4m/min and 2831℃,respectively.With feeding ratio of approximately 1%,feeding speed is decreased with steel strip size increase.The OM observation shows that the technology can enlarge equiaxed grain zone at center to 45%55% of cross section area,greatly eliminating the center segregation and increasing the compactness of center structure,meanwhile,the macro-structure of the continuous casting billet is improved with the decrease of composition heterogeneity at axial direction and improvement of steel strip quality.In addition,the casting velocity of the caster is increased by 30%35%.关键词：Continuous Casting Crystallizer;Feeding Steel Strip;Feeding Speed of Steel Strip;Equiaxed Grain Rate
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发布时间：2023-12-18 - 摘要：Gas porosity is one of the biggest problems in die casting.Caster arm aluminum casting easily generate gas porosity due to its wall thickness and multi-ribs.Through analysis of the product structure,reasonable gating system for exhaust and feeding was designed.Aluminum alloy melting was controlled strictly in the production to ensure the quality of refining.Slow shot die casting technology was adopted with choosing exactly pressure conversion point.Decompression reinforcement and exhausting groove were set on the core of mold deep cavity,reducing effectively gas porosity rate in casting and improving the quality of the caster arm.关键词：Aluminum Alloy Die Casting;Gas Porosity;Gating System;Slow Shot
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发布时间：2023-12-18 - 摘要：Mechanical properties and microstructure of squeezing casting A356.2 spring seat were investigated,and the filling and solidification were simulated by the Anycasting software.Meanwhile,the phenomenon of tensile fractures concentrated on the bottom of the samples was described by the Anycasting software.It is found that the tensile strength,yield strength and elongation of as-cast samples reach 268 MPa and 184 MPa,9.3%,respectively,and after T6 treatment,the mechanical properties of the spring seat reach 330 MPa and 266 MPa,6.4%,respectively.Within a certain range,with the increase of the filling speed and casting pressure,tensile strength and elongation are increased,while change of yield strength can be ignored.After squeeze casting,α-Al phase in the spring seat is refined and tends to agglomeration,however,little impact on the eutectic phase can be observed.The filling and solidification simulation results show that there are three eddy distributed in the bottom,middle and upper of spring seat,and hot spot at the corner of spring seat can be observed,leading to the possible occurrence of shrinkage porosity.The tensile fractures concentrated on the bottom of the samples is attributed to coaction of inclusions and gas involved,which can be eliminated by sectionally changing velocity technique.关键词：Squeeze Casting;A356.2Alloy;T6Treatment;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Numerical simulation method was adopted to predict the filling process of liquid aluminum alloy and defect distribution in the die casting aluminum alloy side cover of gear-box and then to optimize the gating-exhaust system,so the development time of die casting die was shortened significantly.Meanwhile,during mould-trial and production-trial,origination of different defects from the casting process and mould were analyzed,and countermeasures were presented.The results show that a reasonable casting-exhaust system and the cooling system are the keys to obtain high-quality die castings.关键词：Side Cover of Gear-Box;Numerical Simulation;Gating System;Exhaust System;Cooling
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发布时间：2023-12-18 - 摘要：<正>第十届中国国际压铸会议暨展览会即将于2015年7月8日至10日在上海新国际博览中心拉开帷幕。在各方大力协助下,本届展会面积将进一步扩充至20 000平方米,相比上届增长75%,参展企业将突破300家,预计吸引10 000余位专业观众观展。在上届成功举办的基础上,本届展会将再有多项突破,无论从规模、专业度、影响力,及同期活动上都将再度提升。致力于打造中国压铸行业
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发布时间：2023-12-18 - 摘要：Through analyzing shape,structure of DN200 water curtain spool and its investment casting process,investment casting process was designed.For mould design,three-pushing mould was design,and precision position was realized by a cone-shape position ring as position joint.During wax pattern making process,according to the injecting volume,through hand-made lots of irregular hard wax cluster to add into cavity of the mould and then injecting,inadequate injecting volume can be overcome.In addition,through adding cold wax strip,the shrinkage deformation is decreased to improve the dimension precision of the castings,so the high quality parts were produced successfully.关键词：DN200 Water Curtain;Mold;Irregular Hard Wax;Investment Casting
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发布时间：2023-12-18 - 摘要：Steel-Aluminum compound materials were fabricated by inlay casting with un-modification &hot-dip aluminizing（U&H）and surface modification & hot-dip aluminizing（S&H）treated steel as substrates,and the as-cast and T6 heat treatment microstructures and bonding properties of Fe/Al interface were investigated.The U&H casting samples reveal that a variety of gaps exist and metallurgical bonding is absent at the Fe-Al interface.Compared with untreated ones,the interfacial combination of U&H castings is improved,where the bonding force reaches 60.30 kN,increased by 21.23%,and the gap rate is reduced to 10.99%.However,the composite casting samples with S&H treatment reveal the satisfied interface properties with two kinds of interfaces including Fe-Al and Al-Al.The occurrence of"zigzag-shape"transition layer at the Fe-Al interface indicates the existence of metallurgical bonding.Compared with those of U&H castings,the interfacial bonding strength of casting with S&H treatment is improved by more than 13.85%and the gap rate is reduced as low as 2.93%.After T6 heat treatment of S&H modified castings,the thickness of transition layer is increased significantly,especially the"zigzag"whose average length is increased from 31μm to 46μm.And the composition of transition layer is more homogeneous,improving the interfacial force up to 79.71 kN.关键词：Inlay Casting;Steel-Al Compound Materials;Interface;Hot-dip Aluminizing
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发布时间：2023-12-18 - 摘要：The 4343/3003/4343 aluminum alloy cladding ingots were prepared by solid-liquid casting.Effects of pouring temperature on the interface microstructure and bonding strength of the cladding ingots were investigated by OM（optical microscopy）,SEM（scanning electron microscopy）,XRD（X-ray diffraction）.The bonding mechanism of the cladding ingots was described.The results show that the desirable metallurgical bonding compound interface with clear and straight can be observed with pouring4343 aluminum alloy at 725750 ℃.The metallurgical bonding interface of cladding ingots consists of Al-Si solution layer and Si,Mn diffusion layer.The thickness of Al-Si solution layer exhibits uniform,and the diffusion distance of Mn and Si reaches 10μm and 32μm,respectively.The bonding strength of cladding ingots is higher than those of the 3003 aluminum alloy.The bonding mechanism of 4343/3003 interface is that the Al-Si solution layer is formed when the 4343 aluminum alloy melt with high temperature is contacted with the 3003 aluminum alloy,and Si in the Al-Si solution layer and the Mn in 3003 aluminum alloy are diffused to each other to generate the metallurgical bonding interface with high bonding strength.关键词：Aluminum Alloy Cladding Ingot;Liquid-solid Casting;Interface Microstructure;Bonding Mechanism
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发布时间：2023-12-18 - 摘要：A series of（Zr56Co28Al16）100-xYx（x=0,1,2,4）bulk metallic glasses（BMGs）with Ni-free and Cu-free were prepared successfully using water-cooling copper mold method.Effects of yttrium addition on thermal stability,strucrure and mechanical properties of the bulk glassy Zr-Co-Al-（Y）alloys were investigated.The results indicate that the addition of Y can improve significantly the thermal stability and mechanical properties.The supercooled liquid region can be increased from 50K（x=0）to 59.2K（x=2）.Both of compressive fracture strength（σf）and plasticity strain（εp）are enhanced considerably from1 785 MPa,0 %（x=0）to 1 965 MPa,4.1%（x=2）.（Zr56Co28Al16）98Y2 amorphou alloy exhibits satisfied corrosion resistamce in phosphate solution with Youngs modulus of 76 GPa.关键词：Zr-Based Bulk Metallic Glass;Phase Separation;Mechanical Properties;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：With the help of scanning electron microscopy,energy spectrum analysis and X-ray diffraction,the microstructure of intermetallic compounds layer formed during AZ91 Dalloy surface thermal diffusion in the ZnCl2-NaCl low temperature molten salt system was observed,and effects of intermetallic compounds layer on the corrosion resistance of alloy were examined by using polarization curve test.Results show that at diffusion treatment temperature of 325 ℃ and diffusion treatment time of 9,12 and 15h,respectively,the corresponding average thickness of AZ91 Dalloy surface thermal diffusion layer reaches7.7、8.4and 14.7μm,respectively.Surface diffusion layers are mainly composed ofφ-（Mg11Al5Zn4）,τ-Mg32（Al,Zn）49intermetallic compounds with the diffusion treatment time from 9h to 12 h,while the diffusion treatment time is increased to 15 h,it consists ofτ-Mg32（Al,Zn）49intermetallic compounds.The thermal diffusion layer of alloy surface can obviously improve the corrosion resistance of alloy.关键词：AZ91D Magnesium Alloy;Molten Salt Diffusion Treatment;Intermetallic Compounds;Corro-sion Resistance
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发布时间：2023-12-18 - 摘要：In order to produce the high-Al magnesium alloy sheets,the twin-roll casting high-Al magnesium alloy strips with 11.06%Al was produced,and then was homogenized treatment at 400℃ for different holding time.The results show that grain size in the center is smaller than that in the surface for twin-roll casting strip after homogenizing treatment.The plasticity of the alloy is improved and the fracture mechanism has changed.The β-Mg17Al12 phase is almost dissolved and the as-cast-rolled structure is eliminated basically after holding for 3h.关键词：Twin-roll Casting;High-Al Magnesium Alloy;Homogenizing Treatment
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发布时间：2023-12-18 - 摘要：The large-sized flat titanium ingots（8 000mm×1 050mm×210mm）were prepared by electron beam cold hearth furnace.Effects of temperature-differential of melt surface in crystallizer on Fe segregation and its controlling method were investigated.The results show that,the phenomenon of the heterogeneous temperature and local overheating of the melt surface appears due to unreasonable distribution ratio of electron gun scanning power.Furthermore,with the increase of the average temperaturedifferential of the melt surface,the Fe content in flat ingots is decreased,and the degree of Fe segregation in the transverse direction becomes more serious.As a result,the smallest degree of Fe segregation in flat titanium ingots and the most balanced mechanical properties of titanium coils rolled by ingots can be observed with the crystallizer surface scanned by the electron gun with power distribution ratio of32%,28% and 40%to make the average temperature-differential of the melt surface minimum.关键词：Electron Beam Cold Hearth Furnace;Large-sized Ingot of Titanium;Temperature-differential of Melt Surface;Fe Segregation
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发布时间：2023-12-18 - 摘要：Solidification microstructure evolution characteristics of magnesium alloy ZM6 under pressurized condition was explored,focusing on formation and evolution mechanism of second phase β-Mg17Al12 in ZM6 alloy.Meanwhile,the mechanical properties of the ZM6 alloy were measured.The results show that pressure can result in the decrease ofβ-phase precipitates through changing solidification rate to affect the solubility of the primary phase.Grain size of pressurized ZM6 was refined,meanwhile,the generation of short rod-likeβ-Mg17Al12 around thinned grain boundary was observed rarely.Tensile properties and micro-hardness of ZM6 were improved after pressurization.关键词：Pressurized Solidification;Magnesium Alloy;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：Effects of pre-treatment of 6061 Al substrate and Mg alloy modified with Sn on the AM60/6061 compound materials by liquid-solid bonding method were investigated.The results indicate that pretreatment of the 6061 Al substrate by replacing the natural oxide layer with a Zn coating can improve effectively wettability of AM60/6061 liquid-solid compound materials,and desirable metallurgy bonding between Mg and Al substrate can be observed.The microstructure of compound samples can be refined with tin modified Mg alloy.With the increase of tin,Mg2 Sn is distributed dispersedly in the reaction layer,which can improve effectively the interface structure and shear strength.The shear strength reaches a peak value of 32.7 MPa with 1% tin.However,with tin addition more than 1%,shearing strength of the compound materials is decliend.关键词：Sn;Liquid-solid Diffusion Bonding;AM60 Magnesium Alloys;6061Aluminum Alloys;Mi-crostructure and Properties of Interface
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发布时间：2023-12-18 - 摘要：Arc smelting suction casting and melt spinning methods were used to rapidly solidified commercial Al-Ti-B master alloy,respectively.The microstructure changes,grain refining effects and fading resistance of the rapid solidification processed Al-5Ti-B master alloys were investigated.The results reveal that the arc smelting suction casting and melt spinning processing can transform the bulky plate-like TiAl3 phase existing in the microstructure of the commercial Al-Ti-B master alloy to fine and uniformly distributed acicular or granular phases,and eliminate the aggregation of TiB2 particles to make them more evenly distribution.The rapid solidification processing can improve obviously the grain refining effect of the Al-5Ti-B master alloy,and reduce the usage of the mater alloy.The fading grain refining effects of the rapid solidification processed Al-5Ti-B master alloys is absent,and can always keep good grain refining abilities during the long-term holding.关键词：Al-5Ti-B Master Alloy;Rapid Solidification;Grain Refining;Fading
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发布时间：2023-12-18 - 摘要：Microstructure of copper alloy ingot was analyzed by ultrasonic testing combined with metallographic observation.The results reveal that two kinds of shrinkage porosities easily occurs in the forging parts,and they demonstrate different ultrasonic waveform characteristics and microscopic form,which provides effective information to determine the shrinkage porosities for subsequent ultrasonic testing.By analyzing the origination of two kinds of shrinkage porosities,the defects in copper alloy ingot casting were eliminated by modifying casting process,and the yield rate of the copper alloy casting was improved greatly.关键词：Ultrasonic Flaw Testing;Shrinkage Porosities;Copper Alloy Forgings
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发布时间：2023-12-18 - 摘要：Application of new copper base alloy contact material（CSC material）in T90 general electromagnetic relay and JQ-100 Hcontactor was described.Results show that before and after impedance load and life test,the contact resistance of contacts CSC materials can meet the requirements and its electrical life is increased relatively.Microstructure composition analysis shows that the excellent electric performance and improvement of service life of the contact materials are attributed to the existence of the single-phase Mo granular particle,enrichment of Co in the pit of contact surface and uniform distribution of Ni3 Ti in the matrix.And compared with AgCdO contact,its production cost is lower with pollution free to the environment based on ensuring the good comprehensive properties of the contact.关键词：New Copper Base Alloy Contact;Contact Resistance;Electrical Life
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发布时间：2023-12-18 - 摘要：The technological probelems in production of five picth gear rail by coated resin sand were described.Sand box is tilted to（20±5）°during moulding,and pouring was conducted at（1 540±10）℃with pressure of（0.04±0.01）MPa and 23 pit pouring as well as heat preservation agent treatment.Through holding pressure for（300±5）s and cooling for 5hours after pressure-exhausting and then shaking out,the appearance and inner quality of the gear rail parts exhibit satisfactory.关键词：Coated Resin Sand;Five Pitch Gear Rail;Negative Pressure Pouring
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发布时间：2023-12-18
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