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      저자 : Xiling Yao (검색결과 2 건)
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        Effects of Heat Treatment on Microstructures and Tensile Properties of IN718/TiC Nanocomposite Fabricated by Selective Laser Melting

        Xiling Yao,문승기,Bing Yang Lee,Guijun Bi 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.12

        Selective laser melting (SLM) is a powder-bed fusion additive manufacturing process that fabricates metallic parts in a layer-by-layer manner. IN718 is a nickel-based austenitic (γ) superalloy with broad applications in aerospace, chemical, and nuclear industries. In this study, fully-dense IN718-matrix composite reinforced by TiC nanoparticles were fabricated in-situ by SLM. As-built and heattreated IN718/TiC nanocomposite was compared against pure IN718 in terms of microstructures and tensile properties. Columnar and cellular microstructure morphologies in as-built pure IN718 and IN718/TiC nanocomposite were demolished by heat treatment. Microstructure refining and grain boundary dislocation pinning effect of TiC nanoparticles improved the tensile strength of as-built IN718/TiC nanocomposite. In both as-built IN718/TiC and pure IN718, γ and Laves phase are the major constituents while the other precipitates were suppressed by rapid solidification in SLM. Heat treatment dissolved Laves precipitates and grew γ'/γ'', δ, and MC/ M23C6 carbides that strengthened both pure IN718 and IN718/TiC nanocomposite. In heat-treated IN718/TiC, the TiC nanoparticles and M23C6 carbides degenerated from TiC counteracted the deficiency of δ precipitates. Therefore, heat-treated IN718/TiC nanocomposite had similar tensile strength but lower ductility than heat-treated pure IN718.

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        Multidisciplinarydesignoptimizationtoidentifyadditivemanufacturing resources incustomizedproductdevelopment

        Xiling Yao,Seung Ki Moon,Guijun Bi 한국CDE학회 2017 Journal of computational design and engineering Vol.4 No.2

        Additive manufacturing(AM)techniquesareidealforproducingcustomizedproductsduetotheirhighdesign flexibility. Despitethepreviousstudies onspecific additivemanufacturedcustomizedproductssuchasbiomedicalimplantsandprostheses,thesimultaneousoptimizationofcomponents, materials,AMprocesses,anddimensionsremainsachallenge.Multidisciplinarydesignoptimization(MDO)isaresearchareaofsolving complexdesignproblemsinvolvingmultipledisciplineswhichusuallyinteractwitheachother.Theobjectiveofthisresearchistoformulate andsolveanMDOprobleminthedevelopmentofadditivemanufacturedproductscustomizedforvariouscustomersindifferentmarket segments.Threedisciplines,i.e.thecustomerpreferencemodeling,AMproductioncosting,andstructuralmechanicsareincorporatedinthe MDOproblem.Theoptimalselectionsofcomponents,materials,AMprocesses,anddimensionalparametersaresearchedwiththeobjectivesto maximizethefunctionalityutility,matchindividualcustomers’ personal performancerequirements,andminimizethetotalcost.Amulti-objective geneticalgorithmwiththeproposedchromosomeencodingpatternisappliedtosolvetheMDOproblem.Acasestudyofdesigningcustomized trans-tibialprostheseswithadditivemanufacturedcomponentsispresentedtoillustratetheproposedMDOmethod.Clustersofmulti-dimensional Pareto-optimaldesignsolutionsareobtainedfromtheMDO,showingtrade-offsamongtheobjectives.Appropriatedesigndecisioncan bechosenfromtheclustersbasedonthemanufacturer'smarketstrategy.

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