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A study was conducted on the influence of grain boundary elements (GBE) on several P/M nickel base superalloys. Evaluations included microstructural response to chemistry and processing, tensile, creep, rupture, and fatigue crack growth testing (FCG). Boron was found to be the most influential element in the study, with increased boron leading to increased grain boundary triple point void formation and tendency for Thermally Induced Porosity (TIP). Boron reduced creep life but increased both rupture life and rupture ductility and slightly reduced hold time crack growth rates. Carbon also influenced microstructure by slightly refining grain size, and slightly reduced creep and hold time crack growth rates. Hafnium had slight impacts on yield strength and hold time crack growth rates. Magnesium overall had negligible effects. Tantalum had several significant effects, improving creep life and reducing crack growth rates. Overall, the results confirm that careful control and optimization of grain boundary chemistries and grain boundary microstructure are necessary to achieve maximum performance of P/M superalloys.

The Influence of Grain Boundary Elements on Properties and Microstructures of P/M Nickel Base Superalloys