最新刊期
卷 29 ， 期 5 ， 2009
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- 摘要：Ti46Al0.5W0.5Si directional solidification rectangular billets was successfully prepared by electromagnetic confining forming in cold crucible,and the surface morphology,macro-and microstructure of the prepared billets were observed by OM（optical microscope）,SEM（scanning electron microscope）.It is verified that surface morphology of the billets is obviously affected by electromagnetic field.With increasing in drawing velocity,the grain size in the billets is gradually refined and the number of grain is increased.Meanwhile,β and α phases can be observed in primary phase in Ti46Al0.5W0.5Si directional solidification billets,exhibiting a non-equilibrium process.关键词：Electromagnetic Confining Forming;Cold Crucible;TiAl Base Alloy;Directional Solidification
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发布时间：2023-12-18 - 摘要：Effects of element Re on creep behavior were examined by means of measuring creep curves and microstructural observation of the single crystal superalloy containing Re or Re-free.The results indicate that high temperature creep resistance of the single crystal alloy can be greatly improved with Re addition.Compared with those of the alloy containing Re-free,the creep activation energy and stress exponent of the alloy containing 2% Re element during steady creep process can reach up to 478.6kJ/mol and 5.1,respectively,showing a distinct increase in creep lifetimes at high temperature under the condition of low stress.<110>dislocation slipping during initial creep was activated in the matrix channel to form dislocation net-like structure on γ/γ’ phase interface by dislocation reaction among moved dislocations,which is responsible for the improvement of creep resistance of the single crystal alloy,while <110> super-dislocation during completed creep is sheared into the rafted γ’ phase.关键词：Single Crystal Ni-based Superalloy;Re Element;Microstructure;Creep Feature
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发布时间：2023-12-18 - 摘要：In order to improve the brittleness of Mo5Si3 alloy,（Mo1-x,Nbx）5Si3（x=0,0.2,0.4,0.6,0.8,1）alloy was prepared by electric arc melting and annealed at 1200℃ for 50h.Microstructure and properties of the alloy were investigated by XRD（X-ray diffraction）,SEM（scanning electron microscope）and EDS as well as micro-hardness tester.The results reveal that Mo element can improve the stability of β-Nb5Si3 phase.EDS analysis shows that the alloy is composed of（Mo,Nb）5Si3 and β-（Nb,Mo）5Si3 solid solution with a little Mo3Nb2Si3 ternary intermetallics.The solubility of Nb in Mo5Si3 is much higher than that in MoSi2.With increasing in Nb content,the hardness of the alloy is firstly increased and then decreased,showing parabolic curves,and the maximum hardness of HV1616.7 can be observed.In addition,the hardness of the alloy annealed is higher than that without annealed.The indentation fracture toughness of the alloy has not been improved significantly.
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发布时间：2023-12-18 -
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- 摘要：Effects of different rolling temperature,different rolling reduction on microstructure and properties of AZ31 magnesium alloy sheet,which was prepared by unidirectional rolling,were investigated.The results reveal that in the condition of multi-rolling,the prepared AZ31 magnesium alloy sheet with uniform and fine grain with average grain size of 6μm can be observed with rolling at 400℃ and one-passes reduction of 25% after heat treatment,and average grain size of 10 μm in the sheet can be observed with rolling at 400 ℃ and one-pass reduction of 35%.During annealing treatment after rolling,incomplete recrystallization occurs in the sheet at temperature below 150 ℃ and holding for 30 min,and average grain size in the sheet can reach 5 μm after heat treatment at 250～300 ℃,while recrystallization structure becomes coarse with disappearance of twins in the rolled sheet after heat treatment more than 350 ℃.In addition,recrystallization occurs in the rolled sheet after heat treatment at 320 ℃ for 15 min,meanwhile,microstructure change is independent of the increase of holding time to 120 min.关键词：AZ31 Magnesium Alloy;Sheet Rolling;Annealing Treatment;Microstructure
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发布时间：2023-12-18 - 摘要：Al2O3 particle and Al3Zr particle reinforced aluminum matrix composites were prepared in Al-Zr（CO3）2 system by magnetic-chemical in-situ reactive synthesis method.Crystal morphology and growth mechanism in microstructure of the composites were investigated by XRD（X-ray diffraction）,SEM（scanning electron microscope）and TEM（transmission electron microscope）.The results reveal that created Al2O3 and Al3Zr reinforcement with average size in 90～120 nm are uniformly distributed in the matrix alloy,in which in-situ Al3Zr phase exhibits particle,bulk,lamellar or acicular shape.In Al-Zr（CO3）2 system,under the condition of pulsed magnetic field,Al3Zr phase exhibits particle,bulk shape,lamellar shape and acicular shape with reaction at 850℃,900℃,950℃and 1000℃,respectively.There exists growth facets on the surface of the Al3Zr phase,and clear twin face and formed concave groove can be observed in the crystal,where twin face is（114）and twin crystal orientation is [221].The growth morphology of Al3Zr phase is closely relative to the creation and numbers of the twin crystal.In-situ equiaxed Al2O3 phase can be observed in the composites,which is weakly dependent on the reactive temperature.关键词：Magnetic-chemical;Al Matrix Composites;Crystal Morphology;Twin Face
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发布时间：2023-12-18 - 摘要：Oxide inclusion existed in cast Mg-Gd-Y-Zr alloy was analyzed by SEM（scanning electron microscope）and XRD（X-ray diffraction）.The results indicate that the ternary oxides of Zr0.7Y0.28O1.862 and Zr1.894Gd1.894O7 are observed besides the Mg oxide inclusion which is often found in the popular Mg alloy,which is attributed to the oxidation of Y,Gd and Zr.Based on the mechanism of the flux component purifying the Mg-Gd-Y-Zr alloy,a model is presented for describing the formation and movement of the inclusions in the alloy.
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发布时间：2023-12-18 -
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- 摘要：Primary Si phase was finally evolved into spheroidal structure in the modified hypereutectic Al-Si alloy,which was attributed to the coupled twins induced by modifier atom in silicon crystal greatly decreasing anisotropy of primary Si phase growth based on the theory of coupled twins induced by impurity atom.Na-enriched region can be observed in primary Si phase as a result of Na atom absorbed at sub-boundary in coupled twin.Crack of primary Si phase is attributed to sub-boundary decreasing strength of primary Si and Na-enriched region deteriorating further strength of sub-boundary as well as existing thermal stress resulting from difference of thermal expansion coefficient between α-Al phase and Si phase.Crack in spheroidal primary Si appears in solid contract after the hypereutectic Al-Si alloys solidification.关键词：Hypereutectic Al-Si Alloy;Spheroidal Primary Silicon;Coupled Twins
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发布时间：2023-12-18 - 摘要：Gating system for cylinder block in engine was designed based on large orifice discharge theory.Meanwhile,velocity field and temperature field during filling process were visualized by numerical simulation to optimize the grating system design.The results verify that the quality of cylinder block is improved by using the optimized gating system.关键词：Cylinder Block;Numerical Simulation;Gating System;Velocity Field;Temperature Field
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发布时间：2023-12-18 - 摘要：The ultrasonic cavitation exhibits complex physical behavior in aluminum melt,and collapsing acoustic cavitation bubbles can result in instantaneous high pressure shock wave and jet flow in the partial zone of aluminum melt,which can play a key role in refining the grain size as a result of broken dendrite in the alloy.Based on the finite element method,effects of high pressure shock wave formed in the process of bubble collapse on aluminum melt change were simulated.Numerical simulation reveals that the instantaneous maximum pressure and maximum jet flow velocity can reach 105MPa and 400 m/s,respectively.Mechanism of cavitation effects refining grain size in aluminum alloy are described theoretically.Mathematical model for cavitation effects on melt super-cooling and dendrite broken is established.In addition,problems in simulation are presented.关键词：Cavitation Bubble;Finite Element Method;Pressure;Jet Flow;Refinement
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发布时间：2023-12-18 - 摘要：Processing parameters for AM60 magnesium alloy steering wheel frame were optimized by means of the Flow-3D software.The qualified AM60 magnesium alloy steering wheel frame was successfully produced with die of 220℃ and filling at 700℃ as well as injecting at 2.34m/s.The fatigue and tensile properties of the steering frame were tested by universal testing machine for steering wheel frame.The results indicate that the average fatigue service life,average ultimate tensile strength and average elongation reach up to 110000 cycle,220MPa and 5%,respectively.关键词：Magnesium Alloy;Steering Wheel Frame;Numerical Simulation;Properties
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发布时间：2023-12-18 - 摘要：Preparation of semi-solid 2A12 aluminum was carried out by a novel method-sine function cooling method.The semi-solid microstructure with spheroidized structure of the alloy can be obtained,which is attributed to the chilling nucleation of aluminum melt by mold wall and intense stirring effects of sine wave on the melt in process of low-heated 2A12 aluminum alloy melt flowing sine wave equipment,showing the availability of the method.关键词：Sine Function;Semi-solid;Aluminum Alloy;Preparation
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发布时间：2023-12-18 - 摘要：Effects of heat treatment on microstructure and mechanical properties of semi-solid extruded Al-Fe-Cu-Mn-Zn-Mg alloy were investigated by SEM（scanning electron microscope）,TEM（transmission electron microscope）,XRD（X-ray diffraction）and tensile testing.The results reveal that mechanical properties of the semi-solid extruded alloy after T6 treatment are decreased,furthermore,with extending in solution time,the tensile strength of the alloy becomes lower,while it is slightly increased after T1 heat treatment.Semi-solid extrusion has the similar effects with severe plastic deformation,resulting in the re-dissolution of second phase that is equivalent to the heating effects of heat treatment,so it can lead to the growth of second phase in the alloy after solution treatment.关键词：Semi-solid Extrusion;Heat Treatment;Al-Fe based Alloy;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：Microstructural homogeneity in hypereutectic high Cr cast iron by semi-solid rheo-extrusion was investigated.The results show that size of primary carbide is increased with decreasing in particles per area and in shape coefficient in wheel samples at axial direction from the bottom to the top,exhibiting obvious imhomogeneity.However,the absence of obvious difference can be observed in average diameters of primary carbide,carbide particles in per area and shape coefficient in the samples at transverse direction from the edge to the heart,showing desirable microstructural homogeneity.关键词：Hypereutectic High Cr Cast Iron;Semi-solid Rheo-extrusion;Microstructural Homogeneity
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发布时间：2023-12-18 - 摘要：Topological optimization for the moving container platens in die casting machine was conducted based on the ANSYS software.The optimized structure distribution of materials can be obtained in case of non-sacrification of strength and rigidity through comparing topological optimization results under different volumetric confinement conditions.Based on analyzed results,the optimized design can save 13.76% materials.关键词：Die Casting Machine;Mould Platen;Topological Optimization;Finite Element Method
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发布时间：2023-12-18 - 摘要：Shrinkage porosity in low pressure casting aluminum alloy high-voltage electric apparatus base with average thickness of 6 mm and varied thickness can be eliminated by improving gating system to realize sequential solidification and by setting cold iron and cold copper as well as water chilling at defect position.The method can improve the quality of the base,so it can provide a reference to low pressure casting components with varied thickness.关键词：Low Pressure Casting;Varied Wall Thickness;Shrinkage Porosity;Chilling;Sequential Solidification
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发布时间：2023-12-18 -
Electrochemical Performance of Differential Pressure Casting Mg-Ni-Pr Based Amorphous Hydrogen Alloy
摘要：Electrochemical performance of differential pressure casting Mg-Ni-Pr amorphous storage hydrogen alloy was investigated.The results indicate that differential pressure casting can significantly improve the glass formation ability,and critical size of amorphous Mg65Ni21Pr14 alloy is increased from 3 mm in conventional copper mold spraying to 4 mm in differential pressure casting.The maximum hydrogen absorption capacity and effective hydrogen absorption capacity of the amorphous alloy reach 3.62% and 3.48%（weight percentage）,respectively,at 573K.The highest electrochemical capacity makes about 342.6 mA·h·g-1,and it is 302.2 mA·h·g-1 after 20 cycles,88.2% of the maximum electrochemical capacity,so the cycle stability is higher than other Mg-Ni-Pr based amorphous hydrogen storage alloys.关键词：Mg-Ni Based Amorphous Alloy;Hydrogen Storage Alloy;Differential Pressure Casting;Cycle Stability- 2
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发布时间：2023-12-18 - 摘要：Microstructure and properties of squeezing casting AZ81 alloy in as-cast（F）,solid solution（T4）and solid solution plus aging（T6）states were investigated by X-ray diffraction（XRD）,optical microscope（OM）,tensile testing and SEM（scanning electron microscope）.The results indicate that,after solid solution,the β-Mg17Al12 phase generated from non-equilibrium solidification is almost fully dissolved into the squeezing casting AZ81 magnesium alloy,meanwhile,tensile fracture morphology is characterized by ductile dimples with various size,and the plastic properties of the alloy are distinctly improved as a result of plastic fracture increase.In addition,tensile strength and elongation of the alloy after solid solution treatment reach 253.81 MPa and 10.24%,respectively,however,macro-hardness and yield strength of the alloy are slightly decreased.After solid solution plus aging,the β-Mg17Al12 phase is continuously precipitated along the grain boundary and along the matrix,which is responsible for the further improvement of tensile strength to 262.49MPa and great increase of macro-hardness and yield strength with the slightly decreasing in elongation.The fracture morphology of the T6 treated alloy is composed of ductile dimples and cleavage facets,characterized by brittle fracture failure.关键词：Squeezing Casting;Heat Treatment;Magnesium Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：Morphology,thickness and phase constituent of phosphate chemical conversion coating on the die casting AZ91D magnesium alloy were investigated by SEM（scanning electron microscope）and XRD（X-ray diffraction）,and the corrosion resistance of the coating and the matrix alloy were examined in salt spray and damp testing.In addition,the formation mechanism of the coating was described.The results indicate that the phosphate chemical conversion coating exhibits micro-net like structure with some micro-crack and 7.6 μm in thickness as well as uniform distribution,showing excellent protection for the matrix alloy.The coating is composed of amorphous phase,and the chemical compositions in the coating mainly include P,O,Al,Ba,F,Mg elements.The salt spray and damp testing verify that the coating can distinctly improve the corrosion resistance of the AZ91D magnesium alloy matrix.关键词：Magnesium Alloy;Phosphate;Chemical Conversion Coating;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Based on the advantages of centrifugal casting and heat extrusion forming,the mechanical sealing stainless steel spring seat was successfully produced by the combination ways of centrifugal casting with heat extrusion forming.The practical production verifies that the combination ways can effectively shorten processing period,improve the utility of materials and product quality,and save energy due to employing the advantages of the two techniques.关键词：Stainless Steel;Centrifugal Casting;Heat Extrusion Forming;Processing Optimization
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发布时间：2023-12-18 -
- 摘要：Present status of energy consumption and exhaustion-reduction in the foundry trade at the China were described.It is pointed out that recycle economics should be extended and admission condition should be strictly controlled in the foundry trade.Energy-saving and exhaustion-reduction in the investment casting trade were expounded,including optimization of technology,design and materials as well as improvement of casting quality,the use of advanced technology,upgrading of old equipment.关键词：Investment Casting;Energy-saving and Exhaustion-reduction;Sustainable Development
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发布时间：2023-12-18 - 摘要：The worn surface morphology of electric sliding wear Al2O3/Cu composites was observed by OM（optical microscope）and SEM（scanning electron microscope）.It is concluded that during the wearing process of Al2O3/Cu composites,the wear mechanism is characterized by adhesive wear and abrasive wear without current,while it is characterized by adhesive wear,abrasive wear and electrical erosion in the condition of current.Obvious plastic deformation on the surface of Al2O3/Cu composites can be observed in case of current,which can accelerate the creation and propagation of crack with electric erosion and transfer of fused mass.The wearing process is more serious with increasing in current as a result of more and more serious electric erosion.关键词：Al2O3/Cu Composites;Electric Sliding Wear;Plastic Deformation;Electricl Erosion
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发布时间：2023-12-18 - 摘要：TiC particle reinforced 7075 Al matrix composites were fabricated by in-situ reactive liquidus method.Microstructure of the composites was observed by optical microscope to understand the effects of processing parameters on the synthesized process of TiC particle.The results reveal that the TiC particle reinforced 7075 aluminum matrix composites with ideal equiaxed structure and absence of Al3Ti phase can be successfully prepared with pouring at 650 ℃ and C via Ti of 1.25（atom weight）and aluminum melt of 950℃.关键词：In-situ TiC Particle;In-situ Reactive Liquidus Casting;Aluminum Matrix Composites
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发布时间：2023-12-18 - 摘要：By introducing ZrO2（4Y）powder into the thermit,the large-scale plates of new Al2O3/ZrO2（4Y）composite ceramics with various component and structure were prepared by combustion synthesis under high gravity,and the correlation of component,microstructure and mechanical properties of composite ceramics were investigated by XRD（X-ray diffraction）,SEM（scanning electron microscope）and EDS（energy dispersive spectrum）.The results reveal that Al2O3/33ZrO2（4Y）is composed of random-oriented rode-shape colonies embedding by a triangular dispersion of orderly t-ZrO2 submicron fibers,surrounded by inter-colony regions consisting of nano-micrometer spherically-shape t-ZrO2 grains,meanwhile,Al2O3/40ZrO2（4Y）is composed of micronmeter spherically-shape t-ZrO2,surrounded by irregular-shape α-Al2O3 grains and a few colonies.Compared with the international directionally-solidified Al2O3/ZrO2（Y2O3）,the increase of hardness and flexural strength of Al2O3/33ZrO2（4Y）are attributed to high densification,small-size defects and high fracture toughness induced by compressive residual stress toughening and transformation toughening mechanism.In addition,in despite of the moderate decrease in hardness,flexural strength and fracture toughness are increased by 19.0% and 311.1%,respectively,which is attributed to the result of small-size defect in micron-meter spherically-shaped t-ZrO2 grain matrix and high fracture toughness induced by stress-induced t-ZrO2 transformation toughening and transformation-induced micro-crack toughening mechanisms.关键词：Al2O3/ZrO2（4Y）;Combustion Synthesis;High Gravity;Self-growth;Reinforcing and Toughening
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发布时间：2023-12-18 - 摘要：Wear behavior of in-situ reactive sintered Al3Ti/Mg composites was investigated,and was compared with that of pure Mg and AZ91D magnesium.The results show that wear resistance of Al3Ti/Mg composites is greatly superior to that of pure magnesium and AZ91D magnesium alloy as a result of in-situ Al3Ti effectively reinforcing magnesium matrix.Meanwhile,with increasing in volumetric fraction of Al3Ti particle,the wear resistance of the composites is increased.Morphology of worn surface shows that Al3Ti particle is closely bonded with the matrix with homogeneous distribution,which is responsible for undertaking load and improving the wearing behavior.
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发布时间：2023-12-18 - 摘要：Mg-11Li-1Al-xNd alloy was prepared by vacuum electric arc melting method with argon atmosphere.Effects of different Nd content on microstructure and properties of the alloy were investigated by OM（optical microscope）,SEM（scanning electron microscope）,XRD（X-ray diffraction）,EDS(energy dispersive spectroscope,and micro-hardness tester.The results reveal that with increasing in Nd content,the grain size in the alloy is obviously refined with more homogeneous distribution and hardness of the alloy is increased.The desirable grain size in the alloy with maximum value of hardness can be obtained with approximately 3%Nd content.关键词：Nd;Mg-11Li-1Al Alloy;Microstructure;Hardness
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发布时间：2023-12-18 - 摘要：The eutectic Si phase in ZL107 alloy with Sb modification is converted from lamellar structure into particle and isolated block with the uniform distribution of α-Al dendrite and transformation of rod-like Al2Cu into Al2Cu particle.The desirable mechanical properties of the ZL107 alloy with 0.2% Sb modification can be observed as a result of uniform constituent distribution.Sb absorbed at the surface of Si phase can restrict the increase of the thickness of eutectic Si by restraining the growth of eutectic Si,meanwhile,the developed α-Al dendrite with uniform distribution can be observed as a result of increasing in AlSb phase as nuclei,which are responsible for the improvement of mechanical properties of ZL107 alloy with Sb modification.The microstructure and properties of the modified alloy is further improved after T6 treatment.关键词：ZL107 Alloy;Sb;Modification
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发布时间：2023-12-18 - 摘要：Residual stress distribution in the strip-shaped 7A09 aluminum alloy heat treated was examined by the XRD（X-ray diffraction）.Effects of thermal-cooling cycle method on residual stress and dimensional changes as well as dimensional stability of the worked parts were tested by orthogonal testing and typical parts working process,respectively,to optimize processing parameters.The results indicate that the working size stability of the strip-shaped 7A09 aluminum alloy parts can be effectively controlled by thermal-cooling cycle treatment.关键词：Thermal-cooling Cycle;Aluminum Alloy;Dimensional Stability;Residual Stress
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发布时间：2023-12-18 - 摘要：The phase constituent,morphology,hardness,corrosion resistance,thermal-shock resistance and thermal stability of the ceramic coatings produced by micro-arc oxidation on a cast hypereutectic Al-14Si-5Cu-3Ni-1Mg alloy were analyzed by micro-hardness testing,XRD（X-ray diffraction）,SEM（scanning electron microscope）,the Tafel curves,DSC（differential scanning calorimetry）and TG（thermal-gravity）.It is found that the ceramic coating consists of a compact layer composed of α-Al2O3 phase and a loose layer composed of γ-Al2O3 phase and amorphous phase,which is responsible for the improvement of the corrosion resistance.Meanwhile,the hardness of the ceramic coating reaches HV 2400 with desirable thermal-shock resistance and thermal stability.关键词：Micro-arc Oxidation;Cast Hypereutectic Aluminum Alloy;Al-14Si-5Cu-3Ni-1Mg Alloy;Corrosion Resistance;Thermal-shock Resistance;Thermal Stability
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发布时间：2023-12-18 - 摘要：Rotating spraying process was applied to refine aluminum melt in order to obtain high purified melt to eliminate the pinhole and oxide inclusion in the idler pulleys and the pump wheels.The rotating spraying process is distinctly superior to the flux method in refining aluminum alloy through a series of comparative experiments.Optimized processing parameters of rotating spraying process for decreasing pinhole and oxide inclusion in the idler pulleys and the pump wheel were presented in the practical production conditions.The optimized processing parameters are as follows:refining at 720 ℃,the rotary speed of the sprayer of 480～500 r/min,gas flow of 1.6～2.0 m3/h,the adding rate of flux of 100～120 g/min and spraying for 20～25 min as well as holding for 20 min and so on.关键词：Rotating Spraying Process;Refining;Processing Parameters
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发布时间：2023-12-18 - 摘要：Microstructure and mechanical properties of Mg-18.6Gd-1.9Ag-0.24Zr alloy in as-cast,T4 and T6 conditions were investigated by OM（optical microscope）and SEM（scanning electron microscope）.The results indicate that microstructure of the as-cast alloy consists of approximately α-Mg equiaxed dendrite and Mg5Gd phase distributed along grain boundary,and it is composed of supersaturated α-Mg phase and H2Gd phase in T4 solution treatment condition,and precipitated β’ phase in peak-aged alloy can be observed.Effects of different aged temperatures,such as 200,225,250 ℃,on hardness of the alloy were investigated.The results show that with increasing in aging temperature,peak-aged hardness of the alloy is decreased,and peak-aged time is shortened greatly,exhibiting distinctly aging strengthening effects,in which maximum peak-aged hardness of HV134 can be obtained at 200 ℃.The yield strength,tensile strength and elongation of the peak-aged treated alloy at 200 ℃ reach 291.0 MPa,383.5 MPa and 1.17%,respectively.关键词：Mg-Gd-Ag-Zr Alloy;Alloying Element;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The hot deformation behavior of AZ80 magnesium alloy at high temperature was investigated by cylindrical isothermal compression tests.The results indicate that flow stress of the alloy is increased with increasing in strain rate and decreasing in temperature at 200～350℃ in case of 2×10-3～1 s-1.The constitutive equation for flow stress during hot compression is deduced by linear regression analysis,which shows that the sensitivity exponent of strain rate is increased with the increase of deformation temperature.Meanwhile,value of critical strain for dynamic recrystallization is determined by the strain-stress curves based on the kinetics.The equation related to the Zener-Hollomon parameters is given too.关键词：AZ80 Alloy;Constitutive Equation;Sensitivity Exponent of Strain Rate;Critical Strain
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发布时间：2023-12-18 - 摘要：Effects of Ni on the microstructure and mechanical properties of heat resistant cast Cu-Ni-Al alloy were analyzed by optical microscope,EMPA（electron micro-probe analysis）,hardness and compression testing.The results indicate that with Ni content increasing from 10% to 25%,the hardness（HB）,tensile strength,yield strength of the alloy at room temperature are increased by 25.2%,82%,70.5%,respectively,while hardness of the alloy is increased by 40% at 500 ℃.Solution strengthening effects of Ni in Cu matrix and second phase strengthening effects of Ni formed with other alloying element are responsible for the improvement of mechanical properties of the heat resistant cast Cu-Ni-Al alloy.关键词：Heat Resistant Cast Cu-Ni-Al Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The horizontal continuous casting and planetary rolling in the casting-rolling cupronickel BFe10-1-1 were described.Macro-and microstructure,composition distribution and mechanical properties of horizontal continuous tube billets and planetary rolling tube billets as well as problems in casting-rolling process were investigated.The results verify that it is feasible for the casting-rolling cupronickel BFe10-1-1 condenser.The defects in process of casting-rolling tube billets can be eliminated by electromagnetic field.Performance of planetary rolling mill should be improved by cooling bronze TP2 billets with nitrogen gas,emulsion and cooling water due to their cooling rate 2～2.5 times higher than that of the TP2,in addition,new roller materials should be adopted.关键词：Casting-rolling Technology;Cupronickel BFe10-1-1 Condenser;Horizontal Continuous Casting Tube Billet;Planetary Rolling
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发布时间：2023-12-18 -
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