最新刊期
卷 35 ， 期 7 ， 2015
- 摘要：The microstructure evolution and hardness of Mg-7Al-1Si-1Gd alloys at different heat treatment conditions（T4and T6treatment）were investigated.The results show that after solution treatment（400 ℃×12h）,β-Mg17Al12 phase is dissolved mostly intoα-Mg,while Al2 Gd and coarse Chinese script Mg2 Si phases have little change,as a result,the increase of hardness can be ignored.After aging treatment（200 ℃ ×10h）,discontinuous lamellarβ-Mg17Al12 phase is precipitated out along grain boundaries,and Mg2 Si phases are evolved into small block-shaped or rod-like phases,and a peak hardness can be observed,which is increased by 12.45% compared with that of as-cast ones.关键词：Mg-7Al-1Si-1Gd Magnesium Alloy;Microstructure;Hardness;Heat Treatment
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发布时间：2023-12-18 - 摘要：The directional solidification experiment was carried out for hypereutectic Al-40 Cu alloy to prepare4mm×120mm cylinder-shaped ingot at 10μm/s.The solidification structure and macrosegregation at different positions of the ingot were observed by optical microscope and component analysis.The results show that the microstructures in the ingot is changed from a great quantity of Al2 Cu primary phases to absence of Al2 Cu primary phases at different position along growth direction.The macrosegregation of Cu element is attributed to mixing flow in liquid melt.Using the Scheil equation and BH model,the solute segregation in the solidified sample was calculated,which was well agreement with experimental ones.关键词：Al-40Cu Hypereutectic Alloy;Directional Solidification;Macrosegregation;Scheil Equation
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发布时间：2023-12-18 - 摘要：Applied thermodynamics software FactSage,the removal of lead from the scrap brass was simulated by adding Mg-30 Ca alloy,and its thermodynamics of element reactions was analyzed theoretically.Thermodynamic calculation reveals that solid-liquid phase temperature of the scrap leaded brass reaches 824856 ℃.After adding Mg-30 Ca alloy,high melting point CaPb,Ca2 Pb compounds can be observed in the alloy.With increasing in Mg-30 Ca alloy addition in range of 1%2%,CaPb and Ca2 Pb compounds are increased,which can improve effectively deleading efficiency.With 7% Ca-Mg alloy addition at 880 ℃,the deleading efficiency can reach up to 99.6%.Deleading efficiency is decreased with increasing in temperature.Deleading process is consistent with the thermal-dynamics balance process,so increase of temperature is harmful for the deleading in lead brass.The trial-production is well agreement with the simulated ones.关键词：Leaded Brass;Thermodynamics Simulation;Mg-30Ca Alloy;Gibbs Free Energy
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发布时间：2023-12-18 - 摘要：Cold rolling and annealing treatment were carried out for the hot extrusion LA141Mg-Li alloy,and effects of cold rolling deformation and annealing process on microstructure and mechanical properties of the rolled sheet were investigated.The results show that,hot extrusion LA141 magnesium lithium alloy can be cold rolled with a large deformation rate,and the maximum deformation rate reaches more than 95%.With the increase of deformation rate,the tensile strength is increased to 253.42 MPa due to the work hardening and grain refinement,while the elongation is increased and then decreased due to different grain refinement effect.After annealing treatment,recovery and recrystallization occur,which results in the decrease of the tensile strength.After annealing treatment at 250 ℃for 1h,the alloy is recrystallized completely,so grain size is refined,and strength and elongation of the alloy are improved as a result of occurrence of complete recrystallization.关键词：Mg-Li Alloy;Cold Rolling;Annealing;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Al-Ti-B master alloys were fabricated by aluminothermic reaction,which were then improved by multiple melt holding treatment.The microstructure of the master alloy and refining mechanism were described using X-Ray diffraction（XRD）,scanning electron microscopy（SEM）and transmission electron microscopy（TEM）.The results show that the grain refining efficiency of Al-Ti-B master alloys is improved greatly by multiple melt holding treatment.After purification treatment,TiAl3 and TiB2particles are refined to 20μm and 1μm,respectively.As compared with un-treated Al-Ti-B master alloy,the Al-Ti-B master alloy under multiple melt holding treatment can decrease grain size of pure aluminium from 344.6μm to 216.5μm.关键词：Aluminothermic Reaction;Al-Ti-B Master Alloy;Multiple Melt Holding Treatment
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发布时间：2023-12-18 - 摘要：The microstructure and thermo-physical properties of Mg-15Ca-15Zn-6Cu phase change heat storage alloy were investigated by optical microscope（OM）,X-ray diffraction（XRD）and differential thermal scanner（DSC）.By the experiment of melting/freezing thermal cycle,thermal cycling stability of the alloy was analyzed.The results show that,after 1 000 thermal cycles,the phase change temperature and phase change latent heat reach 510.2 ℃ and 198.7J/g,respectivly.Compared with the primary alloy,the phase transition temperature is increased by 5.5%,and phase change latent heat is decreased by5.56%,so the Mg-15Ca-15Zn-6Cu alloy exhibits satisfied thermal cycling stability.关键词：Mg-Based Alloy;Phase Change Heat Storage Material;Thermal Cycling Stability
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发布时间：2023-12-18 - 摘要：According to problems in the multifunction counter-gravity casting equipment in the practical application,a new pneumatic control system was developed.Pneumatic diaphragm valves were replaced by the self-developed assembled digital valve system,and the system has faster responding velocity and more accurate.The new pneumatic control system has the features of higher reliability,control accuracy and easy operation,which improves the practicability of the counter-gravity casting equipment and provides a better working platform for different kind of castings.关键词：Counter-gravity Casting;Low Pressure Casting;Counter-pressure Casting;Pneumatic Control System;Assembled Digital Valve
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发布时间：2023-12-18 - 摘要：To understand effects of different vibration parameters on casting filling behavior,the static casting filling process was simulated by using ProCAST software.Based on EDEM-Fluent solid-liquid coupling model,solid particles motion diagram during liquid metal filling process in two phase flow field under multi-dimensional vibration were visualized approximately.Through orthogonal testing to optimize various vibrating parameters,effects of different frequency,amplitude and free degree on filling behavior were described.The results show that the vibration freedom and frequency have obvious effects on casting filling,while the amplitude has weak effect.In addition,the filling effects of metal liquid under multi-dimensional vibration are superior to those under static conditions.关键词：Multi-Dimensional Vibration;Casting Filling;Coupling Method;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Influences of strain rate on the room temperature properties of TA15 titanium alloy were investigated to provide a reference for the measurement of metal material uncertainty.The stress under high strain rate is almost 1.65 times of the quasi static environment,fully revealing the effects of strain rate on the yield strength of material.With the improvement of strain rate,the yield stress is increased continuously,especially in a dynamic environment.关键词：TA15Titanium Alloy;Strain Rate;Room Temperature Properties;Uncertainty Evaluation
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发布时间：2023-12-18 - 摘要：<正>展会时间:2015年10月5日7日,展会地点:美国印第安纳波利斯展览中心,组委会:北美压铸协会2015年美国压铸展（DIE CASTING CONGRESS&EXPOSITION）是由北美压铸协会举办的压铸行业展会。目前国际展览行业中,专业的压铸展只有两个,该展会就是其中之一。举办方每年仅允许专业的展商和观众前往参加。展会同期召开专业的
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发布时间：2023-12-18 - 摘要：Die casting processing analysis was conducted,and the gating system and cooling system were designed for aluminum alloy gearbox housings.ProCAST software was used to predict the filling and solidification process as well as the temperature field of gear box housing to optimize designs of the gating system and cooling system.According to the design scheme,the feasible die casting mould was designed and manufactured,and the reasonable technology was presented.Production reveals that,the absence of defects such as misrun,cold shut,can be observed.After machining,the defects exceeding the allowed limited values including porosity,shrinkage,and slag inclusion in the products are absent.The trial production shows that the mold design and die casting technology achieve a desirable effect.关键词：Gear box Housing;Die Castings;Gating System;Numerical Simulation
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发布时间：2023-12-18 - 摘要：The thixoforging process of A356/A390 alloy composites at semi-solid state was simulated by finite element software,and filling of bimetal in the compound forming process was visualized to understand effects of forging speed and friction coefficient on compound forming.The results reveal that filling of the dissimilar materials exhibits independent relatively with low loading.Particles in compound interface is subjected to not only shear deformation but also stable pressure.When the forging speed is slow,temperature and stress of composite interface billets become uneven gradually,which leads to compound interface line closed to bottom surface of the middle of the parts slightly.When the forging speed is fast,compound interface line is closed to top surface of the middle of the parts seriously,which leads to the filling un-complete at bottom of the parts.With the forging speed of top die of 120mm/s,temperature and stress of composite interface billets exhibit uniform relatively,and billets is filled fully,so compound interface line demonstates straight at the middle.关键词：Semi-solid Forming;Composite;Al-Si Alloy;Simulation
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发布时间：2023-12-18 - 摘要：Aiming at the problems in local treatment on large equipments,microstructure and properties of the welding zone surface of aluminium alloy before and after the micro-arc oxidation treatment were analyzed,and technical difficulties of micro-arc oxidation treatment on aluminium alloy welding zone were put forward.In addition,several local treatment facilities and methods based on micro-arc oxidation were expounded.Meanwhile,preparation methods of oxide films and a number of factors affecting coating properties were analyzed,finally providing some new insights for future local treatment methods.关键词：Micro-arc Oxidation;Local Treatment;Aluminium Alloy;Welding Zone
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发布时间：2023-12-18 - 摘要：Effects of reheating temperature on microstructure and mechanical properties of thixoforged Al-7Si-Mg alloy were investigated.The results indicate that reheating temperature has greatly effects on the microstructure and mechanical properties of the alloy.With increasing in the reheating temperature,change of the mechanical properties of the powder-thixoforged Al-7Si-Mg alloy are related with the changing of primary particles shape,size and amount of semisolid ingot,and the subsequent generating of defects,such as porosities,liquid segregation during thixoforging.The tensile strength,hardness and elongation of the alloy reach up to 337.7 MPa,128.8（HV）and 10.9% with the alloy thixoformed under reheating for 70 min at 590 ℃ and die temperature of 300 ℃.关键词：Powder Thixoforging;Al-7Si-Mg;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of stirring parameters on microstructure of semi-solid 7075 aluminum alloy slurry were investigated by the Couette Viscometer.It is found that size of the primary solid particles is decreased and spheroidized gradually with the increase of the stirring time and the shearing rate during the isothermal stirring process.During continuous cooling process,with the increase of the cooling rate,the primary grain size is refined gradually with the increase of dendrite particles.During the isothermal holding process,the solid particles are granulated and coarsened with increasing in holding time.关键词：Solid Particle;Stirring Time;Shearing Rate;Cooling Rate;Holding Time
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发布时间：2023-12-18 - 摘要：Three groups macro-micro characteristics in the cross section of A356semi-solid slurry incision were observed.The results show that the basic morphology,size and distribution of primary phases in the slurry prepared can be evaluated roughly through the characteristics in the cross section of the incision.The primary grains in untreated alloy melt present coarsening equiaxed grain and dendrite with varied size and uneven distribution.The primary grains in alloy treated through the helical curve duct present more tiny uniform distributed spheroidization or nearly spheroidizaed morphology.关键词：Slurry Preparation;Cross Section;Microstructure;Helical Curve Duct;3DReconstruction
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发布时间：2023-12-18 - 摘要：The numerical simulation was applied to analyze the filling and solidification process of Al alloy cabin body in counter-pressure casting process.The results indicate that it is difficult to achieve a smooth and layer-by-layer filling pattern by using traditional vertical slot-type pouring system as a result of the splash and rollover of liquid metal.Consequently,the pouring and feeding system was improved based on the simulation and theoretical analysis.The adoption of ring-shaped slot pouring system can improve effectively the filling quality,and a reasonable solidification sequence can be obtained by enlarging the ribs and utilizing the chill blocks combined with top riser.Furthermore,the pressure-holding time was shortened to increase the productivity based on simulation results.关键词：Al Alloy Cabin Body;Counter-pressure Casting;Numerical Simulation;Process Optimization
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发布时间：2023-12-18 - 摘要：Filling and solidification of A356 wheel hub were simulated by numerical simulation.According to the solidification time and temperature at different positions of the wheel hub,solidification modes of different position at the aluminum alloy hub were described,and the inhomogeneity of microstructure at the different solidification modes was described.The results reveal that the alloy is solidified in the way of layer-to-layer in the quenching zone,where grain size and microstructure exhibit homogenous,and in the zone of pressure crystallization solidification zone,the alloy is solidified in the way of simultaneous solidification,where the microstructure exhibits homogeneous distribution with round particles.In the transient zone between quenched and pressure crystallization,the alloy is solidified in the way of pastesolidification,so grain size and microstructure exhibit heterogeneous with obvious segregation of eutectic Si in the grain boundary.关键词：Squeeze Casting;Wheel Hub;Inhomogeneity;Simulation
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发布时间：2023-12-18 - 摘要：Based on the general type of overflow,experimental defect analysis was conducted for die casting products with thin and deep fins during die casting process.The statistics and analysis of the casting defect types were listed,and the origination of these defects was described.By comparing the general type of the overflow model,the tooth shape overflow model was proposed.Based on the statistics defect rate analysis with the tooth shape overflow,the optimized process parameters with low defects were presented.Compared to the general type of overflow,the tooth shape overflow has the advantages of a larger cross-sectional area,gas flow fast,and easy to collect the casting tailings and air effectively.关键词：Die Casting Defects;Overflow;Aluminum Alloy;Experimental Statistics
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发布时间：2023-12-18 - 摘要：Al-12.4Si-4.5Cu and Al-25Zn-10Si-5Mg alloy were prepared by adding pure Zn and pure Mg into the ZL102 alloy.Properties of the two alloy prepared were analyzed by squeezing casting.The results reveal that the optimized processing parameters for the two alloy is the same including preheating mould at 240 ℃,pressure of 150 kN for 16 sand pouring at 630 ℃.After quenching and aging treatment,microstructure of the squeezing castings exhibits more homogeneous and finer compared with that of one without heat treatment.Meanwhile,hardness is increased significantly.With 5% Mg addition,the microstructure and properties of the alloy are superior to those of the initial alloy.关键词：Al-Si-Zn Alloy;Squeeze Casting;Microstructure
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发布时间：2023-12-18 - 摘要：Aiming at low efficiency and high cost in single-crystal copper pole processing with one-flow Ohno continuous casting equipment,and heavy coil of the product difficult to be produced,a horizontal Ohno continuous casting equipment with eight-flow in one furnace for single-crystal copper pole processing was designed.The characteristics of the equipment such as the working principle,structure,features and operating process were described.The practical application shows that the equipment exhibits the satisfied features of high efficiency and low cost in single-crystal copper pole processing.关键词：Single Crystal Copper;Ohno Continuous Casting;Eight-flow In One Furnace;Equipment
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发布时间：2023-12-18 - 摘要：The first low pressure turbine blade of a certain new type aircraft engine was produced by investment casting.The main investment casting procedures were described,such as the wax pattern making and assembly,shell making and alloy melting as well as pouring process.A series of tests were carried out to analyze the casting defects such as adhering sand,misrun and micro-shrinkage.Finally,available process methods and parameters were presented.关键词：Turbine Blade;Adhering Sand;Misrun;Shrinkage
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发布时间：2023-12-18 - 摘要：50%SiCp/Al composites were prepared by powder thixoforming method,and effects of different SiC particle size combinations on microstructure and properties of the composites prepared were expounded.The results show that the SiC particles with different particle size combinations in the composites are distributed uniformly with absence of obvious conglomeration,and the density reaches more than95% with compact structure.The density and bending strength can be improved obviously by the proportioning of different particle sizes,and the main fracture mode is characterized by the brittle fracture.Bending strength of the SiCp/Al composites is in range of 270382 MPa with the thermal conductivity at 111146W·m-1·℃-1.Meanwhile,the mean linear coefficient of thermal expansion of composites from room temperature to 200℃is less than 6×10-6℃-1,meeting the requirement of electronic packaging.关键词：Granularity Combination;SiCp/Al Composites;Powder Thixoforming;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Through the analysis of quantitative metallography of NbC reinforced Ni3 Si matrix composite coating prepared by laser cladding on surface of nickel-based superalloy GH864,a kind of method of digital image processing was put forward to analyze quantitatively the microstructure of laser cladding layer.Based on the Matlab software,the digital image processing methods suah as gray processing,smooth filtering,edge sharpening processing,threshold segmentation,edge detection and so on were adopted to deal with metallographic figure.NbC enhancement phase in the proportion of NbC/Ni3 Si matrix composite coating was calculated using ImageJ software under adding different concentration of[Nb+C]content conditions.The results show that the digital image processing method can realize processing and quantitative analysis of the metallographic image of microstructure of laser cladding layer.In microstructure of NbC/Ni3 Si matrix composite coating,NbC content reaches 3.193% with 8% [Nb+C],and it reaches 5.350% with 15% [Nb+C],and NbC is 5.857% with 20% [Nb+C].关键词：Laser Cladding;Metallographic Figure;Matlab Software;ImageJ Software
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发布时间：2023-12-18 - 摘要：3Dwoven carbon fiber reinforced aluminum composites（3D-Cf/Al composites）have the advantages of impact resistance、non-hierarchical,anti-cracking,fatigue resistance,high integrity.However,carbon fiber and aluminum alloy matrix exhibits poor wettability,so the interfacial reaction is difficult to control in pressure infiltration.On the basis of experiment of unidirectionally aligned Cf/Al composites prepared by the vacuum pressure infiltration,the preparation of 3D-Cf/Al composites by vacuum pressure infiltration process was carried out,and processing parameters were presented.The results reveal that 3D-Cf/Al composites prepared realize a complete infiltration,and the density and tensile strength of3D-Cf/Al composites reach up to 95.88% and 782.33 MPa,respectively,with the preheating temperature of 500550 ℃,infiltration temperature of 730 ℃,infiltration pressure of 8 MPa for 20 min.关键词：3D Woven;Cf/Al Composites;Vacuum Pressure Infiltration
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发布时间：2023-12-18 - 摘要：<正>在2015年6月开幕的2015年德国杜塞尔多国际铸造展（GIFA 2015）上,史杰克西即将全球首发全新设计系列的定量炉。这标志着史杰克西公司的定量技术研发进入新阶段——拥有给轻金属铸造厂带来无尽优势的能力。铝铸造工厂在不断优化工艺程序及技术方面经验丰富。在此,位于德国古默斯巴赫的史杰克西也不例外,史杰克西为全球
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发布时间：2023-12-18 - 摘要：<正>日本6月底港口铝库存下滑,为一年多以来首见,因在现货升水下滑至两年低点后,欧美银行纷纷开始抢购亚洲金属。日本贸易商丸红表示,6月底日本三大港口的铝库存为499 900吨,较之前一个月的502 200吨下滑0.5%。这是铝库存自去年3月以来的首次下滑。
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发布时间：2023-12-18 - 摘要：The Mg-9Al-3Zn-1Mn-6Ca alloy billets were produced by spraying deposition method（the Osprey process）.The microstructure evolution between recrystallization and superplasticity of the deposed billets prepared was observed during pre-deformation and compression deformation.The results show that the superplastic compression deformation can be observed at 350 ℃ and 0.002s-1,and the elongation of outer edge of circumferential reaches up to 103.96%.Superplastic behavior,in which the hardening rate and the dynamic softening rate realize dynamical equilibrium,is accompanied with the occurrence of dynamic recrystallization at 350 ℃,and the strain rate is the key to the superplastic compression deformation in hot-extruded magnesium alloys modified by high-Ca alloying.关键词：Spraying Deposition;Magnesium Alloy;Recrystallization;Superplasticity
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发布时间：2023-12-18 - 摘要：The evaporation characteristics of the Nb-7Ta alloy in the electron beam melting（EBM）processing was analyzed.The relative volatilityβvalues of other elements to the Nb element at 3 473 Kin vacuum melting process were determined.It is found that the main evaporation element is Nb in the EBM process,and then Fe,and the other metal elements are concentrated with different degree.关键词：Nb-7Ta Alloy;EBM;Evaporation;Relative Volatility
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发布时间：2023-12-18 - 摘要：Carburising coating was synthesized on the surface of AZ91 Dby electrolytic saturation in the aqueous solution containing glycerine.The phase constituent,morphology,element distribution,thickness and microhandness of the coating are characterized by XRD,SEM,EDS,thickness tester and microhardness tester.And the process and mechanism of the film formation were discussed.The results show that the total thickness reaches approximately 29μm after 5min at 156 V,which mainly is composed of Mg2C3,MgC2 and Al4C3.The micro-hardness of the film reaches 178.76HV0.025.Electrolytic saturation can synthesize rapidly thick carburising coating with high hardness on the surface of magnesium alloys.关键词：Magnesium Alloy;Electrolytic Saturation;Carbonization
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发布时间：2023-12-18 - 摘要：Effects of rolling temperature and Y content on microstructure of Y-microalloyed Mg-2Zn magnesium alloy were investigated through adjusting initial rolling and final rolling temperature at part of large reduction.The results show that the recrystallization can be observed in the alloy after part of large reduction initial rolling,and the grain almost exhibits full equiaxed grain.In addition,with the increase of rolling temperature,average grain size in the alloy is increased significantly,and the 300℃initial rolling temperature is satisfied.Final rolling temperature should not be too higher or too lower,and it could restrain effectively the twin crystal at 350℃,obtaining homogeneous microstructure.The grain size of magnesium alloy with different Y content is related with rolling system.关键词：Mg-2Zn Magnesium Alloy;Part of Large Reduction;Rolling Temperature;Y;Microstructure
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发布时间：2023-12-18 - 摘要：Effects of Mn on the microstructure,mechanical properties and damping capacity of Mg-1Si alloy were investigated.Experimental results show that the morphology of eutectic Mg2 Si phase can be modified significantly.With 0.5% Mn addition,most of eutectic Si is transformed into fine particles in the alloy,and tensile strength and elongation of the alloy reach 175.1 MPa and 6.5%,increased by35.5% and by 71.1%,respectively,compared with those of the unmodified alloy.Mg-1Si-0.5Mn alloy exhibits the higher damping capacity than the unmodified alloy.关键词：Mn;Mg-1Si Alloy;Microstructure;Mechanical Properties;Damping Capacity
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发布时间：2023-12-18 - 摘要：The orthogonal experiment was designed for heat treatment of ZL102 aluminum alloy.Combined with the tensile strength test,range analysis and variance analysis of orthogonal results were carried out.The desirable heat treatment parameters for aluminum alloy were presented as follows:solid solution treatment at 500 ℃for 7hand aging treatment at 220 ℃for 3h.Effects of heat treatment on mechanical properties of ZL102 alloys were investigated by wheatstone bridge conductivity measurement,optical microscope and scanning electron microscope.The results indicate that,tensile strength and hardness of ZL102 are improved dramatically after heat treatment,and conductivity can also be improved.Consequently,the heat treatment system is feasible.关键词：Orthogonal Experiment;ZL102Alloy;Tensile Strength
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发布时间：2023-12-18 - 摘要：Effects of B、Cu on microstructure and properties of the as-cast aluminum electrical round rod were investigated.The results reveal that B can react with the Fe、Ti、V、Mn impurity elements,and Fe、Ti、V、Mn elements are precipitated out by forming the boride,which can improve the mechanical properties and conductivity to some extent.High mechanical properties can be obtained by composite adding B and Cu,and the conductivity will not be weakened significantly.When the content of B、Cu is 0.08%、0.40%（mass fraction）,the as-cast aluminum electrical round rod exhibits satisfied comprehensive performance,where the conductivity,tensile strength,yield strength reach 34.68MS/m,95 MPa and 78 MPa,respectively.关键词：B、Cu;Aluminum Electrical Round Rod;Conductivity;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of Re addition on the hot corrosion behaviour of directionally solidified（DS）Ni-based superalloys in molten salt system at 900℃ were investigated,and corrosion mechanism was expounded.It is found that the hot corrosion resistance of alloy with Re addition is enhanced gradually.Re can accelerate the oxidation process and lead to a fast formation of protective oxide layer,inhibiting the corrosion of the superalloy.In addition,Re can also form strong acid oxides during corrosion process,which can prevent the alkaline fluxing corrosion.关键词：Rhenium;Hot Corrosion;Directionally Solidified Ni-Based Superalloys
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发布时间：2023-12-18 - 摘要：The nickel-base superalloy with high W,Cr content used for the experiment was prepared with different B additions.And effects of element B on tensile properties and stress rupture life at room and high temperature were analyzed.The influence of heat treatment on the eutectic morphology in the alloy was observed by SEM and XRD analysis.The results reveal that a littileα-W phase can be observed in as-cast alloy,and theα-W phase is dissolved into the matrix after heat treatment,meanwhile,there is only a littleα-W phase nearby the region of grain boundary.Element B in alloy can improve the stress at980 ℃for 83 MPa.At room temperature,with the increase of the content of B,the tensile strength of the alloy was decreased while the plastic is improved.At 900 ℃,with the increase of B,the tensile strength of alloy was increased slightly.The effect of element B on the strengthening effects for grain boundary at room temperature is less than that at high temperature.关键词：B;Ni-based Alloy;Stress Rupture Life;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Processing design for producing pure oxygen nozzle with fusible metal core by sand casting process was described.The processing includes processing procedure,fusible metal core preparation and processing parameters.And the feasibility of the method was verified by experiments.关键词：Metal Core;Oxygen Lance Nozzle;Casting;Processing
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发布时间：2023-12-18
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