Dissertations / Theses on the topic 'Aluminum casting'
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Ziolkowski, Joseph Edmund. "Modeling of an aerospace sand casting process." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-1223102-102625.
Full textChen, Chien-Lung. "Evaluation of aluminum die casting defects causing casting rejection during machining." Connect to resource, 1997. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1155309911.
Full textSaleem, Muhammad Qaiser. "Helium Assisted Sand Casting of Aluminum Alloys." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-dissertations/204.
Full textWu, Yaping. "Numerical analysis of direct-chill casting of aluminum ingot." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=672.
Full textTitle from document title page. Document formatted into pages; contains xi, 150 p. : ill. (some col.) Vita. Includes abstract. Includes bibliographical references (p. 86-89).
Ammar, Hany. "Effet des imperfections de la coulée sur les propriétés en fatigue des alliages de fonderie aluminium silicium = Effect of casting imperfections on the fatigue properties of aluminum-silicon casting alloys /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.
Full textTenekedjiev, Nedeltcho. "Strontium treatment of aluminum : 17% silicon casting alloys." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61774.
Full textJoseph, Carolyn M. "Detection of Floating Grains in DC Aluminum Casting." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/109015.
Full textCataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 42-44).
Free-moving "floating" grains have been linked to macrosegregation in direct-chill (DC) aluminum castings. The presence of these grains in the sump of a solidifying ingot has been acknowledged based on measurements of cast microstructures and by recent work using a turbulent jet to suspend solute-poor grains and minimize macrosegregation.1,2 Experiments in this study were designed to sample grains from the mushy region of two ingots, one cast by the standard method and another stirred with a turbulent jet. Measurements of floating grain size, concentration, morphology, and chemical composition are reported. The observations from the standard ingot offer a point of comparison for floating grain theories and casting models. The measurements from the stirred ingot show how the turbulent jet modifies the distribution, concentration and morphology of the floating grains.
by Carolyn M. Joseph.
S.M.
Hogan, Patrick Alan. "Prediction and Reduction of Die Soldering." Digital WPI, 2008. https://digitalcommons.wpi.edu/etd-theses/523.
Full textTurkyilmaz, Gokhan. "Processing And Assessment Of Aluminum Ceramic Fiber Reinforced Aluminum Metal Matrix Composite Parts For Automotive And Defense Applications." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610751/index.pdf.
Full textC and 800 °
C. In the first part of the thesis, physical and mechanical properties of composite specimens were determined according to the parameters of silicon content of the matrix alloy, infiltration temperature and vol% of the reinforcement phase. X-ray diffraction examination of fibers resulted as the fibers mainly composed of deltaalumina fibers and scanning electron microscopy analyses showed that fibers had planar isotropic condition for infiltration. Microstructural examination of composite specimens showed that appropriate fiber/matrix interface was created together with small amount of micro-porosities. Bending tests of the composites showed that as fiber vol% increases flexural strength of the composite increases. The highest strength obtained was 880.52 MPa from AlSi10Mg0.8 matrix alloy reinforced with 30 vol% Saffil fibers and infiltrated at 750 °
C. Hardness values were also increased by addition of Saffil fibers and the highest value was obtained as 191 HB from vertical to the fiber orientation of AlSi10Mg0.8 matrix alloy reinforced with 30 vol% Saffil fibers. Density measurement revealed that microporosities existed in the microstructure and the highest difference between the theoretical values and experimental values were observed in the composites of 30 vol% Saffil fiber reinforced ones for both AlSi7Mg0.8 and AlSi10Mg0.8 matrix alloys. In the second part of the experiments, insertion casting operation was performed. At casting temperature of 750 °
C, a good interface/component interface was obtained. Image analyses were also showed that there had been no significant fiber damage between the insert and the component.
Capps, Johnathon. "Advancements in vacuum process molding and casting." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Summer/master's/CAPPS_JOHNATHON_6.pdf.
Full textGarza-Delgado, Abelardo. "A study of casting distortion and residual stresses in die casting." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196175848.
Full textShabestari, Saeed G. "Formation of iron-bearing intermetallics in aluminum-silicon casting alloys." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28920.
Full textThe kinetics of both dissolution of intermetallics on melting, and of re-formation on cooling of the liquid were investigated by means of quenching experiments. Quantitative evaluation of intermetallic size and number revealed that the change in volume fraction of intermetallics in the liquid state is controlled by nucleation.
The effect of settling time and the rate of gravity segregation of intermetallic compounds in a stagnant liquid metal were investigated. It was found that, in the absence of convection, settling obeys Stokes' law with the terminal velocity reached at very short times and very close to the melt surface.
Strontium was used to modify or eliminate the iron-intermetallics. (Abstract shortened by UMI.)
Ragel, Kamal R. "Three dimensional modeling of vertical DC casting of aluminum alloys." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84313.
Full textA parametric study has been carried on two casters of variable aspect ratio each using a different type of inlet melt distribution system. In the case of the small aspect ratio caster, the physical properties of aluminum Al-3104 are used. For this caster, the studied parameters are the casting speed, the primary cooling rate, the melt superheat and the combo-bag dimensions. Also, the effect of complete blockage of the bottom windows of the distribution bag is studied. An in-depth understanding of some behaviors of the melt flow and solidification profile in the steady state operational phase of the DC casting process is gained. For example, the roles played by the angle flow and the upward component of the vertical recirculation at the wide symmetry plane in controlling both the solidification front depth and the mushy layer thickness at the slab center are ascertained. This study has revealed the influence of the melt stream issued from the bottom window of the bag on the depth and uniformity of the solidification front. The model has successfully identified a faulty design of the short combo bag. This industrially favorite design causes what is called the reverse flow, that is, the melt from the surrounding sump enters the combo bag through the bottom window. (Abstract shortened by UMI.)
Wu, Chang Kai. "Predicting the Response of Aluminum Casting Alloys to Heat Treatment." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/117.
Full textSoderhjelm, Carl. "Multi-Material Metal Casting: Metallurgically Bonding Aluminum to Ferrous Inserts." Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-dissertations/174.
Full textRidgeway, Colin D. "Integrated Computational Materials Engineering (ICME) of Aluminum Solidification and Casting." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587378327014374.
Full textSaha, Deepak. "Novel Processing Methods and Mechanisms to Control the Cast Microstructure in Al Based Alloys - 390 and Wrought Alloys." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-041405-150300/.
Full textDemirel, Onur. "Development Of Automobile Chassis Parts Via Aluminum Extrusion And Sand Casting Technology." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614965/index.pdf.
Full text36 aluminum alloy was selected because of its high fluidity and good mechanical properties
despite it is a die cast alloy. Tensile, hardness and Charpy impact test were conducted to determine the mechanical characteristics of Silafont - 36 sand cast alloy. In addition to microstructure features and thermal analysis were also carried out to achieve sufficient alloy properties. Heat affected z one was investigated by hardness and tensile test to determine the mechanical properties change after welding process. In this space frame development study, A, B and C pillar parts were produced by Al &ndash
Si sand casting and T6 heat treatment then welded together by TIG welding and finally assembled on the bottom chassis frame produced by using 6063 extrudes welded by 4000 series electrodes. The space frame chassis was studied by also computer simulation to test and see critical points which must be modified during manufacturing. Besides the experimental and theoretical studies, space frame was also produced at the same time. According to the experimental results, the feasibility of the production of lightweight and solid chassis structure was achieved.
Wei, Xiaodan. "Thermal mechanical analysis of interfacial behavior in aluminum alloy wheel casting process." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46024.
Full textGuthy, Hema Vardhan. "Evolution of the Eutectic Microstructure in Chemically Modified and Unmodified Al-Si Alloys." Digital WPI, 2002. https://digitalcommons.wpi.edu/etd-theses/191.
Full textKurtoglu, Aziz. "Aluminum Oxide And Titanium Diboride Reinforced Metal Matrix Composite And Its Mechanical Properties." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605381/index.pdf.
Full textRivero, Paz Ive. "The effect of key microstructure features on the machining of an aluminum-silicon casting alloy /." View online, 2010. http://ecommons.txstate.edu/engttad/1.
Full textVenkatasamy, Vasanth Kumar. "Analysis of in-cavity thermal and pressure characteristics in aluminum alloy die casting." Connect to this title online, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1100721824.
Full textBates, William. "Casting repair and Surface Modification of Aluminum Alloys using Friction Stir Processing (FSP)." Thesis, Högskolan Väst, Avdelningen för Industriell ekonomi, Elektro- och Maskinteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-16675.
Full textDuan, Jianglan. "Development of a numerical optimization methodology for the aluminum alloy wheel casting process." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57699.
Full textApplied Science, Faculty of
Materials Engineering, Department of
Graduate
Dewhirst, Brian A. "Optimization of the heat treatment of semi solid processed A356 aluminum alloy." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-111705-111503/.
Full textKeywords: microstructure; casting; Fluid Bed; Quality Index; Aluminum; A356; heat treatment; SSM; Semi Solid Metal Includes bibliographical references. (p.105-106)
Nemeth, Bill. "Casting conditions and iron variant effects on the subsequent nucleation of Al₂₀Cu₂Mn₃ dispersoid phase in Al-4Cu-0.4Mn-0.2Si alloys." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20805.
Full textDabayeh, Ashraf A. "The role of casting defects in the fatigue behavior of notched cast aluminum alloys." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/NQ32821.pdf.
Full textTu, Zhiqiang. "Fabrication and Mechanical Properties of Carbon Fiber Reinforced Aluminum Matrix Composites by Squeeze Casting." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40523.
Full textPapai, Jonathan Pearson. "Contact heat transfer coefficients in aluminum alloy die casting: an experimental and numerical investigation/." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu148784937729536.
Full textSivertsen, Halses Sebastian. "Die life prediction using High Pressure Die Casting simulations." Thesis, Tekniska Högskolan, Jönköping University, JTH, Material och tillverkning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-50031.
Full textCampo, Kaio Niitsu 1988. "Uso da extrusão em canal angular na produção da liga A356 para tixoconformação." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265929.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-24T12:59:54Z (GMT). No. of bitstreams: 1 Campo_KaioNiitsu_M.pdf: 7361224 bytes, checksum: c6570a6666ed0e98563f7345bc5c6734 (MD5) Previous issue date: 2014
Resumo: Este trabalho investigou o uso da extrusão em canal angular (ECA) na produção de matéria-prima para tixoconformação visando à obtenção de uma rota simples e eficiente na formação de microestruturas globulares. Para tanto, uma liga de alumínio A356 foi submetida a um único passe ECA e, em seguida, reaquecida ao estado semissólido a 580°C. Dessa forma, pôde-se determinar a evolução morfológica e os mecanismos envolvidos na formação da pasta metálica, a influência do tratamento isotérmico na evolução microestrutural no estado semissólido, o comportamento de deformação durante a compressão a quente e o comportamento mecânico em tração do material tixoconformado. Os resultados indicaram que apenas um passe ECA foi suficiente para gerar uma pasta metálica refinada e globular apenas com o reaquecimento da matéria-prima. O engrossamento da microestrutura durante o tratamento isotérmico foi controlado principalmente pelo mecanismo de Ostwald ripening, fato comprovado pelo baixo valor da constante taxa de engrossamento K, o que mostrou a estabilidade dessa pasta no estado semissólido. As amostras exibiram comportamento tixotrópico típico com baixos valores de viscosidade aparente, na faixa de 10^2 a 10^3 Pa.s para as taxas de cisalhamento testadas. Por fim, as amostras tixoconformadas apresentaram valores de ductilidade e resistência à tração superiores aos das amostras fundidas e deformadas por um passe ECA
Abstract: This work investigated the use of equal channel angular pressing (ECAP) for the production of raw materials for thixoforming in order to obtain a simple and efficient processing route to generate globular microstructures. Therefore, an A356 aluminum alloy was processed by one ECAP pass, and then reheated to the semisolid state up to 580°C. Thus, it was possible to determine the morphological evolution and mechanisms involved in the formation of the semisolid slurry, the influence of isothermal treatment on microstructural evolution in the semisolid state, the deformation behavior during hot compression tests and the tensile properties of the thixoformed material. The results indicated that a single ECAP pass was sufficient to promote a refined and globular semisolid slurry. Microstructure coarsening during the isothermal treatment was mainly controlled by Ostwald ripening, which was verified by the low rate constant K, showing the stability of the reheated material in the semisolid state. The samples exhibited typical thixotropic behavior with low apparent viscosity ranging from 10^2 to 10^3 Pa.s over the applied shear rates. Finally, the thixoformed samples exhibited values of ductility and tensile strength superior to the as-cast and ECAPed samples
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
Forté, Martin. "Modélisation de l'écoulement de l'aluminium semi-solide dans le moulage sous pression /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.
Full textLa p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en génie. CaQCU Bibliogr.: f. [142-145]. Document électronique également accessible en format PDF. CaQCU
Keles, Ozgur. "Production And Characterization Of Alumina Fiber Reinforced Squeeze Cast Aluminum Alloy Matrix Composites." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609726/index.pdf.
Full textC and 800 °
C. Micro porosity was present at the fiber-fiber interactions. Closed porosity of the composites increased when fiber vol% increased, however, variation in casting temperature and magnesium content in matrix did not have influence on porosity. Hardness of the composites was enhanced with increasing fiber vol%, magnesium content in matrix and decreasing casting temperature. Alignment of fibers within the composite had an influence on hardness
when fibers were aligned perpendicular to the surface, composites exhibited higher hardness. The highest hardness values obtained from surfaces parallel and vertical to fiber orientation were 155.6 Brinell hardness and 180.2 Brinell hardness for AlSi10Mg1 matrix 30 vol% alumina fiber reinforced composite cast at 800 °
C and at 750 °
C, respectively. 30 vol% Saffil alumina fiber reinforced AlSi10Mg0.3 matrix composite cast at 750 °
C showed the highest flexural strength which is 548 MPa. Critical fiber content was found as 20 vol% for all composites.
Nandakumar, Varun. "Process and Tool Design for the High Integrity Die Casting of Aluminum and Magnesium Alloys." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1409032627.
Full textBinney, Matthew N. "Porosity reduction in high pressure die casting through the use of squeeze pins /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19810.pdf.
Full text王培義. "Extrusion casting of aluminum alloys." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/61781702036910042467.
Full text羅玉林. "Squeeze casting of aluminum alloys." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/88156529009138003987.
Full text(10729758), Clayton M. Kibbey. "A380 Aluminum Hot Chamber Die Casting." Thesis, 2021.
Find full textYu, Chia-Chieh, and 余家杰. "ANALYSIS OF CASTING PROCESS OF ALUMINUM WHEEL." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/90338218672705307073.
Full text元智大學
機械工程學系
91
Aluminum disc wheels intended for normal use on passenger cars are commonly produced by gravity casting. If the cooling process and initial temperature of mold are not well controlled, shrinkage cavity will occur after solidification, which might cause leakage problems to the disc wheel. This thesis simulated the casting process by computer simulation, and a Shrinkage Index (SI) is defined using the phenomenon of liquid entrapped. This thesis then discussed the influence of cooling process, initial temperature, and geometry of the wheel on SI after the mold temperature has converged. The relationship between SI and the percentage of wheels that have leakage in real test was discussed. We can use the simulation process and SI to predict the quality of the casting wheel and to find the optimal parameters.
Yang, Chao Wei, and 楊朝維. "Numerical Simulation of Aluminum Die-casting Process." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/fbayuk.
Full text正修科技大學
機電工程研究所
105
In the manufacturing process of die casting, the filling pattern of alloy liquid is featured with fast flow and short coagulation time might lead to the presence of cavity, shrinkage pore and inclusion inside the product, thus invoking the poor air tightness and mechanical property decline. This project intends to employ the die casting analysis software Procast to perform the modelling, process analysis and quality prediction for the massive products of the cooperative company. The stringent requirements include boreholes rate of valves smaller than 1.0% of motor housing and carburetor case, etc. With the analysis outcomes provided by Procast, such as the microstructural module, semi-solid pressure casting module, and aluminum alloy database module, the precise suggestions for improving the mechanical properties and manufacture process parameters can be made. Next, the manufacture bottlenecks of different products will be tackled as well, such as (1) the effect of silicon amount in the aluminum alloy liquid on the fluidity and microstructural variation of the large-scale discoidal die casting pieces; (2) the overload cavity due to the bore inside the servo-motor case of different size of vehicle steering gear. With the software, the common problems faced in the exploitation of products, such as pouring system, residue removal system, inner pouring gate, overflow tank, air vent, the material selection of pressure casting and so on, can be solved by offering better solutions. In addition, by proper assumption and setting of software, the manufacture parameters like die injection speed, filling time, preheating temperature of mold and supercharging ratio can be improved by using the outcomes of simulation. The execution period of this project is one year. We have been conducted more than 10 exchanges with the company's R & D. We completed the software analysis, product defect forecast and provide improvement proposals for the products developed by the company to effectively enhance the quality of their products.
Ortega, Pelayo Rosa Elia. "Direct Chill and Fusion Casting of Aluminum Alloys." Thesis, 2012. http://hdl.handle.net/10012/7153.
Full textMo, Hsieh Kai, and 謝楷模. "Casting Simulation Analyses of A390 Aluminum Brake Shoe." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/25923705432499927949.
Full text大葉大學
機械工程研究所碩士班
93
The A356 aluminium alloy was used on the casting of the brake shoe in the near years, but, the braking action was apt to cause the brake shoe to increase its body size because of its higher thermal expansion character of A356 alloy. The phenomenon would induce the brake lining to contact the brake drum abnormally and to decrease the braking efficiency. The A390 aluminium alloy with low coefficient of expansion can then be used to cast the brake shoe and thus to solve this problem. This research is aimed at evaluating how to cast the A390 aluminum alloy brake shoe by the CO2 sand mold method, utilizing the computer-aided engineering (CAE) simulation software FLOW-3D to study the influences of gating system designs on the A390 alloy brake shoe, and to analyze the flow of filling and the solidification of brake shoe castings. In addition, the simulations are also conducted and expected to achieve the optimum design of gating and riser systems for the A390 alloy brake shoe, and the X-ray examinations for the practical castings poured are carried out to evaluate the validity of FLOW-3D simulations. The criteria of predicting the defects produced in castings which are built in the software FLOW-3D, including the solidification fraction, solidification time, solidification gradient, solidus velocity and Niyama porosity index were used to determine the gating system designs, and to find the position of the shrinkage in the brake shoe castings. The results of this study indicate that the gating system with design of the sprue well can alleviate the flowing impact of aluminum melt falling from the inlet of sprue to the runner. While the design of bilateral R corners joining the runner and the ingate can reduce the flowing velocity at the ingate. Besides, the non-pressurized gating system with 1:4:4 gating ratio can effectively control the velocity at the ingate and prevent the turbulence of melt flow compared to the other gating systems with gating ratio(1:2:2, 1:2:3 and 1:3:3). The practical castings show that the shrinkage defects occurred are in accordance with the results of simulation. Finally, the casting designs by the FLOW-3D would improve the quality of A390 alloy brake shoe castings.
Chen, Po-Chen, and 陳柏辰. "Optimal Analysis of A390 Aluminum Automobile Piston Casting." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/80526583166623459238.
Full text大葉大學
車輛工程學系碩士班
92
The goal of this study was to understand the solidification and flow phenomena of A390 aluminum alloy automobile piston casting, under the computer-aided designing simulation by the computer-aided engineering (CAE) software. The CAE simulation was also determined to get the optimal casting design of piston, and the real castings were done to estimate the reliability of CAE simulation. The experimental results indicate that the non-pressurized gating system with cylindrical runner can effectively control the ingate velocity and reduce the turbulence of flow when compared to the other designs. Besides, the better ingate should be arranged at the side of piston skirt. The top riser set on the piston casting had the best feeding result. The design of chill on the piston casting with and without riser whether it is top or side, the feeding of shrinkage could not be successful and the defects also occurred inside the piston casting. The yield was changed from 78 percents to 91 percents by way of optimization design and simulation of riser on the piston casting, and the simulation results also revealed the non-pressurized gating system with the cylindrical runner and top riser design has the better yield then the other system design. Finally, the casting design of the A390 aluminum alloy automobile piston casting would be certainly evaluated by the CAE software.
CHIANG, TSO CHUNG, and 蔣作群. "The reaserch of casting and anodizing for aluminum alloy." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/08240296473611572335.
Full text國立中央大學
機械工程學系
85
AbstractThe purpose of the research is to improve the capability of casting ,welding and coloring anodized aluminum of two different materials , such as Al-Mg 514 cast alloy aluminum and Al-Zn-Mg 7005 extrusion aluminum. Since casting a 514 alloy thin rectangular test plate (250㎜×120㎜×4 ㎜)for welding was not easy , the author adopted four methods for casting and did many tests to solve it. Subsequently the property of 514 alloy was promoted by using various homogenization treatments and adding grain refiner , degassing and altering cast conditions , controlling the flow rate of melt alloy to reduce the phenomenon of shrinkage and hot tearing and enhance the mechanical properties of 514 alloy . The suitable cast conditions are recommended:(1)the temperature of melted aluminum alloy be controlled in the range from 770℃to 810℃(2) the temperature of mold be controlled in the range from 350℃to 370℃.The influence of adding alloy element and altering homogenization treating temperature was observed by means of Optical Microscope(OM), Scanning Electron Microscope(SEM), and Multiple tensile test(MTS).With altering various homogenization temperatures and adding alloy Al-Ti-B refiners and zirconium alloy elements, the results showed that mechanical properties of 514 alloy could be improved effectively . For 514 alloy ,higher homogenization temperature (450℃~490℃)was better than lower homogenization temperature (410℃~430℃). In observing microstructure of 514 alloy , it was interesting to find that the higher homogenization temperature was , the lower the eutectic phase in microstructure was , and the refiner in microstructure region observed was.In the mean time , adding the Al-Ti-B refiners and Zr adequately ,the tensile strength and elongation of the specimens will be excellent .The SEM fractograph inspections of tension failure areas were also applied to check the fracture morphology , which indicated that the fracture was of a typical ductile fracture .Choosing a proper filler , either 4043, 5183, 5356 , or so on , to weld two different materials was very important . After comparing the results of various welded specimens , it was found that the 5356 filler worked better than the others in coloring match if theoperating conditions were in the range from 134 to 156 amp and from 13 to 14.5v.Finally , to make sulfuring acid anodizing aluminum have excellent corrosion and wear resistance , it was oxide coated in the following conditions : (1)the concentration of sulfuric acid is 15%(165g/l) , (2) the operating temperature is 17℃, and (3) the operating time is 50 min.
LIN, GUAN-YI, and 林冠億. "Application of CAE in Aluminum Alloy Tilt Gravity Casting." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/h89y4x.
Full text逢甲大學
機械與電腦輔助工程學系
106
The objective of this research is to evaluate the effectiveness of gating design and misrun problem caused by back pressure of the A356 aluminum alloy tilt gravity casting vent using the foundry CAE software, ProCAST. The metallographic microstructure and hardness variation of A356 aluminum alloy casting through melt treatment to heat treatment are also evaluated. The simulation result shown that unpressurized gating system with gating ratio of “1:1.7:3.52” has a lower flow speed than “1:1.7:1.13”. Flow speed decreased about 18%. The molten aluminum flow gets steady when pouring. The simulation result is in good agreement with the actual result when “back pressure” is included in the simulation. The simulation showed that increasing vent area will help to solve the misrun problem. The correction value of “back pressure” is 0.067atm in this simulation result. The metallographic microstructure results of the casting at each process shown that ingot has a partial effect of modification and refinement when contenting 0.025% Sr and 0.025% Ti. After modification treatment and refinement treatment, the refinement effect of eutectic silicon and grain size were increased. The hardness of casting had a great promote after T4 heat-treatment and T6 heat-treatment. The CAE simulation method saved 63% of time and 40% of cost when compared with the tradition “Trail-and-Error” method.
(7041476), Mohamadrusydi B. Mohamadyasin. "DEVELOPMENT OF HIGH DUCTILITY ALUMINUM ALLOYS FOR DIE CASTING." Thesis, 2019.
Find full textAluminum-Silicon (Al-Si) alloys are often preferred in the die casting industry due to excellent castability, high strength, corrosion resistance and low cost. Commonly, iron (Fe) is alloyed with the alloys to prevent die soldering. However, the addition of Fe in most of Al-Si alloys leads to formation of the intermetallic β-AlFeSi. The β-AlFeSi is harmful to the alloy structural integrity due to its needle-like morphology that creates stress concentration at the microscopic level. The phase presence is unfavorable to the mechanical properties and significantly reduces the elongation of the alloys. This research attempted to find viable way to control the morphology and formation of the β-AlFeSi phase.
Thermodynamic simulations were done to investigate the sequence of intermetallic formation and other phases at different alloy compositions. The analysis of solidification paths of different alloys provided the correlation between the phase formation sequence and the fraction of the β-AlFeSi phase. The analysis also identified the feasible region of alloy design for minimizing the β-AlFeSi formation. Based on the thermodynamics simulation analysis, five alloys of different compositions were designed to validate the finding of the simulation.
The tensile test results of the alloys indicated that lowering the Fe content increases the elongation of the alloy. The results also showed that elongation was reduced with the increase of Si level due to the formation of eutectic Silicon. The change of both Fe and Mn did not significantly affect the mechanical property of the alloy when the ratio of Fe to Mn was constant. Microscopic analysis showed that lowering the Fe level had effectively altered the morphology of the β-AlFeSi needle like structure. The β-AlFeSi was found to be smaller in terms of size when Fe is lower, subsequently reducing the probability of β-AlFeSi phase to be stress riser and crack initiation.
The influence of heat treatment to the mechanical property of the alloys was also studied. The mechanical result on the heat-treated samples indicated that heat treatment is a viable method to improve the elongation property of the alloy. Microscopic observations showed that the β-AlFeSi phase was broken into shorter structures over the solution heat treatment process, resulting in better elongation.
Kuan, Chung-Hao, and 關中皓. "Studies on Squeeze Casting and Gravity Casting in Gas Tungsten Arc Welding of A356 Aluminum Alloy." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/39512267594439091470.
Full text國立中央大學
機械工程學系
85
A356 aluminum alloy of the squeeze castings and gravity castings were fusion welded with the gas tungsten arc welding process.The effects of gas flow rates,T6 heat treatment, and the type of filler metal were investigated under different welding conditions. The appearance of the welded surface under anodic treatment was also compared and analyzed. It was found that the gas flow rates greatly influenced the weld porosity and the evaporation of low boiling point alloy element (such as Mg).The resulting properties of the welding are caused by both the filler metal composition and the microstructure in the fusion zone and heat-affected zone. The result of these experiments indicated that:1.Increasing shielding gas flow rates,above 20L/ min.,was reduced weld porosity and inhibited the evaporation of magnesium.2.The extent of heat-affected zone was widened in welding under T6 heat treatment. It also concerned about hardness profile,anodic coating and grain size.3.The more content of silicon in aluminum alloy castings resulted a gray colorof appearance which under anodic treatment.
Ng, Harry. "Direct Chill Casting of Aluminum Alloys: Experimental Methods and Design." Thesis, 2011. http://hdl.handle.net/10012/5749.
Full textSong, Ming-An, and 宋敏安. "Study on the Preparation of Porous Aluminum by Die Casting." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/73938846652249658549.
Full text國立清華大學
化學工程學系
89
The preparation of porous aluminum by die casting was investigated in this work, including both the 〝lost foam 〞method and the〝ceramic ball preform 〞method. In the lost foam die casting method, we utilized the swelling phenomenon caused by soaking the polymer foam in a proper organic solution to increase the ligament thickness and its porosity. As a result, the ligament thickness and porosity of finished products can be easily tailored. Using different polymer foams from various suppliers, we can make porous aluminums whose ligament thickness is in the range of 0.117∼0.458mm and porosity about 90∼95%. In the ceramic ball preform method, we found a special formula(weight ratio of Al2O3:bentonite:HPMC:water:PVA is 100:1:2:48.3:2.4) for making ceramic balls with sufficient strength to survive the casting procedures. These ceramic balls of several mm in size, can be easily removed from the finished products by high pressure water after casting. One of the ingenuity of this procedure lies in the fact that these ceramic balls are soft and deformable at room temperature. For this reason, we can apply pressure to increase the compactness of the packed bed made of these ceramic balls. As a result, the porosity the finished products can be substantially increased. On the other hand, the uniformity of the product can be improved if regular packing technique was employed rather than the random packing method. On the average, the porosity of the product is in the range of 80∼89%.