Additive manufacturing provides a new way to develop high-performance superalloys and components. A γ′- strengthened CoNi-base superalloy suitable for additive manufacturing was developed,and a crack-free block material was prepared by optimizing the parameters of electron beam melting(EBM) technology. The experimental results show that the lowest porosity of the alloy is about 0.14% when the scanning speed is 2000 mm/s. The microstructures of the as-printed CoNi-base alloy are columnar grains growing along the <001> direction,the average grain width is about 235 μm,and the volume fraction of γ′ phase is about 30%. After hot isostatic pressing and solution aging treatment,the porosity of the alloy is further reduced to about 0.09% with unobvious change of columnar grains. The average size of γ′ phases is about (70±18)nm with the volume fraction of about (32±3.6)%. The results of room temperature tensile tests show that the additive manufactured γʹ-strengthened CoNi-base superalloy exhibits excellent strength and ductility,showing a good potential of industrial application.
Microstructures and mechanical properties of AMed CoNi-base superalloy based on EBM
2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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