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Microstructural evolution and mechanical properties of Alloy 718 fabricated by selective laser melting following different post-treatments

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Rare Metals 2021年第11期40卷 3222-3234页

作者： Hao Luo Xiao-Qiang Li Cun-Liang Pan Peng-Jiang He Ke-Li Zeng National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China Institute of Materials and Processing Guangdong Academy of SciencesGuangzhou 510650China Dongguan Hyperpowder Co.Ltd. Dongguan 523808China

In this study,Alloy 718 specimens were fabricated via selective laser melting(SLM),and the effects of different post-treatments on microstructures and mechanical properties of the alloy were systematically *** post-treatment techniques investigated were solid solution+dual aging(SA) and hot isostatic pressing+solid solution+dual aging treatment(HIP+SA).The results indicate that the specimens treated using SA have a columnar crystal structure similar to the as-built sample,the microstructure is partially recrystallized,and the grain size increases ***,the grain morphology is dominated by equiaxed crystals in samples treated using HIP+SA,and the microstructure is completely recrystallized,with distinct grain coarsening and a large number of twins *** treated using SA and HIP+SA show high tensile strength and yield strength and excellent elongation at room temperature,which can be primarily attributed to the strengthening of the γ’ and γ "precipitated *** number of γ" precipitated phases are reduced due to the consumption of Nb to form a large amounts of δ phase and(Ti,Nb)C carbides,resulting in the strength of HIP+SA specimens being lower than that of SA specimens.

关键词： Selective laser melting Alloy 718 post-treatments Microstructural evolution Mechanical properties

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Al matrix composites fabricated by solid-state cold spray deposition:A critical review

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Journal of Materials Science & Technology 2021年第27期86卷 20-55页

作者： Xinliang Xie Shuo Yin Rija-nirina Raoelison Chaoyue Chen Christophe Verdy Wenya Li Gang ji Zhongming Ren Hanlin Liao ICB UMR 6303 CNRSUniv.Bourgogne Franche-ComtéUTBMF-90010BelfortFrance Univ.Lille CNRSINRAECentrale LilleUMR 8207UMET-UnitéMatériaux et TransformationsF-59000LilleFrance Department of Mechanical and Manufacturing Engineering Trinity College DublinThe University of DublinParsons BuildingDublin 2Ireland Institute of Mechanics Materials and Civil EngineeringUC LouvainLouvain-la-NeuveBelgium State Key Laboratory of Advanced Special Steels School of Materials Science and EngineeringShanghai UniversityShanghai200444China State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an710072China

Cold spraying(CS),or cold gas dynamic spray(CGDS),is an emerging solid-state powder deposition process,allowing fast and mass production and restoration of metallic *** of metal matrix composites(MMCs)has attracted increasing attention from academia and industry over the last decades,especially in the area of Al matrix composites(AMCs),which have demonstrated a high potential for applications in aerospace,automotive,and electronics *** article aims to summarize the recent development of CS-processed AMCs in terms of composite powder preparation,deposition processing,microstructure evolution,mechanical and corrosion ***,this review also reports the relevant research progress with the focus on post-treatments of the AMCs for CS additive manufacturing applications including heat treatment,hot rolling,and friction stir ***,the challenges and perspectives on the fabrication of advanced AMCs by CS are addressed.

关键词： Al matrix composites Solid-state cold spraying Additive manufacturing post-treatments

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