A Study of the Role of Grain-Boundary Engineering
in Promoting High-Cycle Fatigue Resistance
HOME Problem: Nickel & Titanium base superalloys are widely used in turbine applications which require their high temperature strength and resistance to environmental attack. Despite the wealth of recent research on the high-cycle fatigue (HCF) of Ti and Ni alloy turbine engine blades and disks, there have been few studies on ways to improve the HCF resistance of these alloys through microstructural control.

Objective: To examine the feasibility of using grain-boundary engineering techniques to enhance the HCF resistance of Ni and Ni-base superalloys.

Approach: Using strain/anneal cycles to increase the proportion and contiguity of special "grain boundaries" in high-purity nickel and a nickel-base superalloy ME3, characterization of the effect of such microstructures on the stress/life fatigue properties and the large- and small- fatigue-crack propagation resistance.

Last updated 04/12/06 by Yong Gao (ygao@lbl.gov)
Recent Publication

High-Cycle Fatigue of a Nickel-Base Superalloy ME3 at Ambient and Elevated Temperatures: Role of Grain-Boundary Engineering by Y. Gao, M. Kumar, R. K. Nalla, and R. O. Ritchie, Metallurgical and Materials Transactions A, vol. 36A (12), Dec. 2005, pp. 3325-3333.