access icon openaccess Rotary bending fatigue properties of Inconel 718 alloys by ultrasonic nanocrystal surface modification technique

This study investigates the influence of ultrasonic nanocrystal surface modification (UNSM) technique on fatigue properties of SAE AMS 5662 (solution treatment) of Inconel 718 alloys. The fatigue properties of the specimens were investigated using a rotary bending fatigue tester. Results revealed that the UNSM-treated specimens showed longer fatigue life in comparison with those of the untreated specimens. The improvement in fatigue life of the UNSM-treated specimens is attributed mainly to the induced compressive residual stress, increased hardness, reduced roughness and refined grains at the top surface. Fractured surfaces were analysed using a scanning electron microscopy (SEM) in order to give insight into the effectiveness of UNSM technique on fracture mechanisms and fatigue life.

Inspec keywords: bending; compressive strength; scanning electron microscopy; iron alloys; chromium alloys; nanostructured materials; fatigue; internal stresses; nickel alloys

Other keywords: compressive residual stress; fatigue life; SAE AMS 5662; hardness; rotary bending fatigue tester; UNSM technique; SEM; Inconel 718 alloys; ultrasonic nanocrystal surface modification technique; rotary bending fatigue properties; fractured surfaces; scanning electron microscopy; UNSM-treated specimens; fracture mechanisms

Subjects: Plasticity (mechanical engineering); Fracture mechanics and hardness (mechanical engineering); Engineering materials

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