Tailoring the partitioning behavior of solid solution strengtheners is a crucial design strategy for advanced Ni-based superalloys. The goal this study was to maximize enrichment Mo, Re, Ru and W in γ-matrix phase. To determine composition dependency behavior, set polycrystalline superalloys with varying contents these solution-strengthening elements W-containing single-crystalline alloy series...

The effect of Ni and Cr additions on microstructure, lattice misfit, oxidation, creep properties are investigated for six W- Mo-free cobalt-based superalloys with compositions Co-xNi-5Al-yCr-3V–2Ti-1.5Nb-1.5Ta-0.08B (at.%), where x = 10, 20, or 30 y 4 8. In all alloys, the γ + γ′ microstructure is stable up to 1000 h upon aging at 850 °C. As increases from 10 at.%, area fraction 32 49% in three...

Abstract Modifications of the binder phase ( γ ) cemented carbides have potential to increase hardness and wear resistance whole material. Partially, coherent precipitations with L1 2 structure (γ’) promise these improved properties without sacrificing tensile strength or toughness. ’ is a metastable in Al–Co–W ternary system form Co 3 (Al,W) which stabilized by substitution cobalt nickel. Supe...

Additive manufacturing (AM) of non-weldable high-γ’ Ni base superalloys is challenging due to various issues, but notably because their inherent cracking propensity. Typically, the segregation melting point-depressant elements grain boundaries (GB) drastically increases solidification interval, allowing high processing-induced stresses in parts pull apart liquid film at GBs. To achieve a better...

Abstract The γ′ volume fraction is a key parameter in precipitation-strengthened Co- and Ni-base superalloys mainly determines the alloys’ properties. However, systematic studies with varying fractions are rare influence on thermal expansion has not been studied detail. Therefore, series of six Ta-containing Co-based alloys was designed compositions γ – tie-line, where changes systematically. D...

Abstract The γ-γ′ Co-based alloys have attracted extensive attention as a new class of materials for high temperature applications. work is focused on quantitative and qualitative microstructural characterization selected type superalloys obtained by gravity casting. four were prepared via vacuum induction melting. microstructure was analyzed means light microscopy scanning electron microscopy....