Journal ArticleDOI
Effect of Ultrasonic Nanocrystal Surface Modification on residual stress, microstructure and fatigue behavior of ATI 718Plus alloy
TLDR
In this paper, the authors investigated the use of ultrasonic nanocrystal surface modification (UNSM) to improve the fatigue life of ATI 718 Plus (718Plus), which led to nano-sized crystallites, twins, and high dislocation density in the near surface regions.Abstract:
Ultrasonic Nanocrystal Surface Modification (UNSM) is a mechanical surface treatment that induces large compressive residual stresses and near-surface microstructural changes in the material using repetitive impacts at ultrasonic frequencies with a WC tip. In this study, we investigate the use of UNSM to improve the fatigue life of ATI 718 Plus (718Plus). UNSM induced severe surface plastic deformation in 718Plus, which led to nano-sized crystallites, twins, and high dislocation density in the near surface regions, coupled with an increase in surface hardness by 2.3 GPa and high magnitude of compressive residual stresses. These changes increased the endurance limit by ~ 13% (~ 100 MPa) in room temperature fatigue tests. This improvement in fatigue life was attributed to near-surface microstructural changes, material hardening and high compressive residual stress induced by UNSM. The crack propagation rates were 66% lower for UNSM-treated 718Plus as compared with untreated material. The residual stress relaxation after cyclic loading indicates the effectiveness of UNSM in improving the fatigue life of 718Plus.read more
Citations
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Journal ArticleDOI
The effects of shot peening, laser shock peening and ultrasonic nanocrystal surface modification on the fatigue strength of Inconel 718
TL;DR: In this paper, the effects of different surface severe plastic deformation techniques including severe shot peening, laser shock peening and ultrasonic nanocrystal surface modification have been investigated on the microstructure, mechanical properties and fatigue behavior of nickel-based superalloy Inconel 718.
Journal ArticleDOI
On the influence of ultrasonic surface rolling process on surface integrity and fatigue performance of Ti-6Al-4V alloy
TL;DR: In this article, an ultrasonic surface rolling process (USRP) was employed for enhancing the fatigue performance of a Ti-6Al-4V alloy, and the effect of USRP on their surface integrity (including microstructure, surface quality, microhardness, and residual stress) were investigated by means of scanning electron microscopy, transmission electron microscope, confocal laser scanning microscope, micro hardness tester and X-ray diffraction residual stress tester.
Journal ArticleDOI
Effects of residual stress on the mechanical properties of copper processed using ultrasonic-nanocrystalline surface modification
Ji Hyun Moon,Seung Mi Baek,Seok Gyu Lee,Yujin Seong,Auezhan Amanov,Sunghak Lee,Hyoung Seop Kim +6 more
TL;DR: In this paper, the effects of surface grain refinement and residual stress on the local and global properties of pure Cu processed using ultrasonic nanocrystalline surface modification (UNSM) were investigated.
Journal ArticleDOI
The effect of ultrasonic surface rolling process on the fretting fatigue property of GH4169 superalloy
TL;DR: In this article, an ultrasonic surface rolling process (USRP) is carried once and three times on material surface and the effect of surface integrity on fretting fatigue (FF) is investigated.
Journal ArticleDOI
Fretting fatigue characteristics of Ti-6Al-4V alloy with a gradient nanostructured surface layer induced by ultrasonic surface rolling process
TL;DR: In this article, a gradient nanostructured (GNS) surface layer is synthesized on the surface of a Ti-6Al-4V alloy by means of the ultrasonic surface rolling process (USRP).
References
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