Microstructurally sensitive crack nucleation around inclusions in powder metallurgy nickel-based superalloys

Precipitation in Powder-metallurgy, Nickel-base Superalloys: Review of Modeling Approach and Formulation of Engineering (postprint)

Accelerated Threshold Fatigue Crack Growth Effect – Powder Metallurgy Aluminum Alloy

Fatigue crack growth (FCG) research conducted in the near threshold regime has identified a room temperature creep crack growth damage mechanism for a fine grain powder metallurgy (PM) aluminum alloy (8009). At very low ∆K, an abrupt acceleration in room temperature FCG rate occurs at high stress ratio (R = Kmin/Kmax). The near threshold accelerated FCG rates are exacerbated by increased levels...

Fatigue Crack Growth in a Particulate TiB2-Reinforced Powder Metallurgy Iron-Based Composite

Fatigue crack growth behavior has been examined in a particulate titanium diboride (TiB2)–reinforced iron-based composite that had been produced via a mechanical alloying process. Comparison with equivalent unreinforced material indicated that fatigue crack growth resistance in the composite was superior to monolithic matrix material in the near-threshold regime. The composite exhibited relativ...

Diffusion Welding of Nickel-based Superalloys

Ni based superalloys can be welded by diffusion bonding. Temperature, diffusion coefficient, activation energy and Boltzmann constant influence the quality of diffusion bonding, so obtaining the best condition for welding is considered. Showing the suitable condition for diffusion welding of nickel-based superalloys is the aim of this paper.

Physcial Metallurgy and Microstructure of Superalloys

When significant resistance to loading under static, fatigue and creep conditions is required, the superalloys have emerged as the materials of choice for high temperature applications. This is particularly true when operating temperatures are beyond about 800C. This is the case for gas turbines used for (i) jet propulsion, e.g. the 100,000 lb thrust engines used for powering large two-engined ...