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Materials science & engineering. properties, microstructure and processing. A, Structural materials v.729, 2018년, pp.64 - 75   SCI SCIE
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Influence of heat treatments on microstructure evolution and mechanical properties of Inconel 625 processed by laser powder bed fusion

Marchese, Giulio (Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy ) ; Lorusso, Massimo (Center for Sustainable Future Technologies - CSFT@PoliTo, Istituto Italiano di Tecnologia,, Corso Trento 21, 10129 Torino, Italy ) ; Parizia, Simone (Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy ) ; Bassini, Emilio (Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy ) ; Lee, Ji-Won (Department of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, 51140 Changwon, Republic of Korea ) ; Calignano, Flaviana (Department of Management and Production Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy ) ; Manfredi, Diego (Center for Sustainable Future Technologies - CSFT@PoliTo, Istituto Italiano di Tecnologia,, Corso Trento 21, 10129 Torino, Italy ) ; Terner, Mathieu (Department of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, 51140 Changwo ) ; Hong, Hyun-Uk ; Ugues, Daniele ; Lombardi, Mariangela ; Biamino, Sara ;
  • 초록  

    Abstract This study investigated the mechanical behaviour and microstructure of as-built and heat-treated Inconel 625 (IN625) samples processed by laser powder bed fusion (LPBF). This process offers freedom in design to build complex IN625 components in order to overcome extensive machining. However, post heat treatments must be performed to obtain specific mechanical properties to match industrial requirements. For this purpose, different heat treatments were performed on IN625 samples, and through hardness measurements, three different heat treatments were selected, as optimised conditions. A direct ageing, a solutioning and a solutioning followed by ageing treatments were chosen to study the effects of these specific heat treatments on the microstructure and tensile properties, comparing them to those of as-built condition. The tensile properties of as-built and selected heat-treated IN625 samples showed superior values to minimum requirements for wrought IN625 alloys, whereas the investigation on the microstructures and fracture surfaces of as-built and heat-treated IN625 contributed to an understanding of the tensile properties evolution. The high tensile strength of as-built samples essentially derived from very fine dendritic structures mainly below 1 μm with high dislocation density and nanometric MC carbides. The high tensile properties of ageing treatments performed at 700 °C for 24 h, whether directly aged or post-solutioning, were found to be primarily dependent on γ" phases (10–30 nm) and M 23 C 6 carbides formation. By contrast, the tensile properties of solution-treated IN625 samples at 1150 °C for 2 h showed higher ductility coupled to lower strength than other conditions, due to the grain growth.


  • 주제어

    Laser powder bed fusion .   Nickel superalloys .   Tensile behaviour .   Microstructure .   Hardness.  

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