Effects of B content on microstructure and high-temperature stress rupture properties of a high chromium polycrystalline nickel-based superalloy

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

“…[9] However, solidification cracking may occur due to incipient melting point depression, as shown by differential thermal analysis (DTA) or differential scanning calorimetry (DSC). [10] Limited solute exchange between liquid and solid phases promotes eutectic solidification microstructures and deteriorates the creep resistance. [10,11,76] In the solid state, low solid solubility of B in Ni and its affinity to segregate to GBs are well documented.…”

“…[10] Limited solute exchange between liquid and solid phases promotes eutectic solidification microstructures and deteriorates the creep resistance. [10,11,76] In the solid state, low solid solubility of B in Ni and its affinity to segregate to GBs are well documented. [48,[77][78][79][80][81] Such micro-segregation is driven by changes in the reduction of interfacial free energy (equilibrium segregation) or vacancy annihilation from atom-vacancy complexes (nonequilibrium segregation).…”

“…[4][5][6] Primary and scrap materials are combined in a sequence of melting, remelting, and thermo-mechanical processing to achieve the desired composition, microstructure, and shape of components. [7][8][9][10][11] A typical property profile for static components in aircraft engines is a yield strength >900 MPa, elongation >30%, and creep rupture strength in 1000 h of >100 MPa at operation temperatures of %800 °C. [12,13] Efficiency improvements for the next generation of gas turbine engines will require materials design using the highest alloyed Ni-based superalloy grades to unlock superior high-temperature strength.…”

Effects of Solution Temperature on Tensile Properties of a High γ′ Volume Fraction P/M Superalloy

“…Co can reduce stacking fault energy and enhance creep resistance [ 12 , 13 ]. Minor elements including Zr, B and Hf are also indispensable for the tailoring of mechanical properties by purifying or stabilizing grain boundaries [ 14 , 15 , 16 , 17 , 18 ]. Strengthening via solid solution strengthening and precipitation plays a dominant role in improving alloy strength, while excessive refractory elements lead to the formation of topologically close-packed (TCP) phases, which are detrimental to mechanical properties [ 19 , 20 , 21 ].…”

Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCox high‐entropy alloys fabricated by vacuum hot‐press sintering

“…However, the content of Ni, Co, and other precious metals in the alloys is high, which is not conducive to reducing production costs. [5][6][7][8][9] Therefore, researching and developing new superalloys with simple structures, excellent comprehensive properties, and low costs is of considerable scientific and practical significance.…”