Effect of ultrasonic nanocrystal surface modification on elevated temperature residual stress, microstructure, and fatigue behavior of ATI 718Plus alloy

Effect of ultrasonic nanocrystal surface modification on elevated temperature residual stress,... International Journal of Fatigue 110 (2018) 186–196 Contents lists available at ScienceDirect International Journal of Fatigue journal homepage: www.elsevier.com/locate/ijfatigue Effect of ultrasonic nanocrystal surface modification on elevated temperature residual stress, microstructure, and fatigue behavior of ATI 718Plus alloy a, a b a Micheal Kattoura , Seetha Ramaiah Mannava , Dong Qian , Vijay K. Vasudevan Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221-0072, USA Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080-3021, USA ARTICLE I NFO ABSTRACT Keywords: Ultrasonic Nanocrystal Surface Modification (UNSM) is a mechanical surface treatment that induces large Ultrasonic Nanocrystal Surface Modification compressive residual stresses and near-surface microstructural changes in the material by using repetitive (UNSM) impacts at ultrasonic frequencies with a WC tip. In this study, we investigate the use of UNSM to improve Nickel-based superalloys the fatigue life of ATI 718 Plus (718Plus) at high temperature of 650 °C. UNSM induced severe surface High temperature fatigue plastic deformation which led to nano-sized crystallites, twins, and high dislocation density in the near Residual stresses surface regions, coupled with an increase in surface hardness and high magnitude of compressive residual Electron microscopy stresses. This change in the near-surface http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Fatigue Elsevier

Effect of ultrasonic nanocrystal surface modification on elevated temperature residual stress, microstructure, and fatigue behavior of ATI 718Plus alloy

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0142-1123
eISSN
1879-3452
D.O.I.
10.1016/j.ijfatigue.2018.01.017
Publisher site
See Article on Publisher Site

Abstract

International Journal of Fatigue 110 (2018) 186–196 Contents lists available at ScienceDirect International Journal of Fatigue journal homepage: www.elsevier.com/locate/ijfatigue Effect of ultrasonic nanocrystal surface modification on elevated temperature residual stress, microstructure, and fatigue behavior of ATI 718Plus alloy a, a b a Micheal Kattoura , Seetha Ramaiah Mannava , Dong Qian , Vijay K. Vasudevan Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221-0072, USA Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080-3021, USA ARTICLE I NFO ABSTRACT Keywords: Ultrasonic Nanocrystal Surface Modification (UNSM) is a mechanical surface treatment that induces large Ultrasonic Nanocrystal Surface Modification compressive residual stresses and near-surface microstructural changes in the material by using repetitive (UNSM) impacts at ultrasonic frequencies with a WC tip. In this study, we investigate the use of UNSM to improve Nickel-based superalloys the fatigue life of ATI 718 Plus (718Plus) at high temperature of 650 °C. UNSM induced severe surface High temperature fatigue plastic deformation which led to nano-sized crystallites, twins, and high dislocation density in the near Residual stresses surface regions, coupled with an increase in surface hardness and high magnitude of compressive residual Electron microscopy stresses. This change in the near-surface

Journal

International Journal of FatigueElsevier

Published: May 1, 2018

References

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