Open AccessRotary bending fatigue properties of Inconel 718 alloys by ultrasonic nanocrystal surface modification technique
Author(s) -
Kim JunHyong,
Suh ChangMin,
Amanov Auezhan,
Kim HakDoo,
Pyun YoungSik
Publication year - 2015
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2015.0071
Subject(s) - inconel , materials science , residual stress , surface modification , bending , surface roughness , scanning electron microscope , nanocrystal , surface finish , fatigue limit , composite material , ultrasonic sensor , fracture (geology) , metallurgy , nanotechnology , alloy , mechanical engineering , medicine , engineering , radiology
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.