A longstanding challenge in materials engineering has been how to extend the fatigue life of critical nickel-based superalloy structures (e.g., Inconel 718) that contain holes. These hole structures, commonly used for bolts and fasteners in rotating parts, create stress concentration sites that are prone to cracks and failure under repeated stresses of high-temperature operation.
Why some hot-running parts last longer: Rotating expansion strengthens superalloy holes where cracks start
