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• W3024563456 endingPage "101282" @default.
• W3024563456 startingPage "101282" @default.
• W3024563456 abstract "The thermal history developed in laser powder bed fusion (LPBF) processes has been shown to be complex resulting in equally complex microstructures and mechanical properties. Microscopic observations and Vickers micro-hardness mapping measurements were carried out on diff ;erent section planes of LPBF alloy 718 cuboids. Three-dimensional finite element analysis was used to simulate thermal history and to predict the residual stress distribution in the as-built material. Computational thermodynamics was used to predict the micro-segregation and nucleation driving force of various phases in the bulk and in segregated regions. Varied heat-treatments such as simulated hot isostatic pressing, and double aging were applied. Their influence on the microstructure, micro-segregation, precipitate formation, and micro-hardness variations of LPBF alloy 718 were investigated. Hardness map results showed heterogeneous micro-hardness on the xy- and xz-planes of the as-built parts where the bottom plane and center regions had larger hardness of ∼315 HV0.5 while the top plane and contours showed hardness of ∼300 HV0.5. It was found that the aging treatment increased the overall hardness of the as-built condition from ∼310 HV0.5 to 470 HV0.5 but also increased the hardness gradient throughout the coupon. After simulated hot isostatic pressing process (i.e., without applied pressure) at 1020 °C for 4 h followed by water quench (HIPWQ), the hardness gradient and hardness was minimized (∼210 HV0.5) as the microstructure transitioned from heterogeneous columnar grains in the as-built condition to more uniform recrystallized grains. A double aging treatment was applied to enhance hardness from ∼210 HV0.5 to ∼440 HV0.5. HIPWQ followed by double aging produced a homogeneous microstructure and more uniform hardness map with enhanced mechanical properties in LPBF alloy 718 coupons." @default.
• W3024563456 created "2020-05-21" @default.
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• W3024563456 date "2020-10-01" @default.
• W3024563456 modified "2023-09-23" @default.
• W3024563456 title "Effect of heat treatment on microstructural evolution and hardness homogeneity in laser powder bed fusion of alloy 718" @default.
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• W3024563456 doi "https://doi.org/10.1016/j.addma.2020.101282" @default.
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