Numerical Design of CoNi-Base Superalloys With Improved Casting Structure

Abstract Numerical methods can accelerate the design of alloys with improved material properties. One approach is coupling multi-criteria optimization CALPHAD-based models alloy While this technique has already yielded promising new Nickel-base superalloys, applicability to CoNi-base not yet been investigated. These show properties for application as wrought high-temperature materials. We designed three which were optimized either high strength or chemical homogeneity. The cast, and mechanical thermophysical characterized. showed creep performance inferior a conventionally CoNi-alloy but had much lower density. For developing highly homogeneous alloys, Scheil calculations implemented in routine quantify severity segregation. Non-equilibrium phases could be predicted successfully, resulting degree homogeneity that rivaled low-segregation ternary Co-base alloy. A comparison elemental partitioning behavior phase transition temperatures CALPHAD trends are well represented most part. Finally, Co-rich superalloys evaluated, possible applications discussed.