Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments aircraft engines gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists a polycrystalline γ ‐matrix, strengthening Ni 3 (Al,Ti) ′ precipitates, carbides (MC, M 6 C, 23 C ), borides (M 2 B, B , 5 other inclusions. Microalloying additions Zr commonly improve strength creep resistance, although excessive detrimental. Grain boundary (GB) segregation may cohesion displace embrittling impurities. Finely dispersed desired to control grain size via GB pinning. However, decoration GBs lead failure during processing in‐service. Hence, systematic review on the roles in cast is required. The current state knowledge precipitation reviewed. Experimental modeling results compared across various steps. impact mechanical properties most well researched. Co‐precipitation proximity interacting with local evolution remains less explored. Addressing these gaps allows more complete understanding processing–microstructure–properties relationships advanced superalloys.