Improving fatigue life of additively repaired Ti-6Al-4V subjected to laser-assisted ultrasonic nanocrystal surface modification

Sammy A. Ojo; Blake Bowser; Kannan Manigandan; Gregory N. Morscher; Yalin Dong; Andrew L. Gyekenyesi; Onome E. Scott-Emuakpor

doi:10.1016/j.ijfatigue.2023.107663

Improving fatigue life of additively repaired Ti-6Al-4V subjected to laser-assisted ultrasonic nanocrystal surface modification

Sammy A. Ojo, Blake Bowser, Kannan Manigandan, Gregory N. Morscher, Yalin Dong, Andrew L. Gyekenyesi, Onome E. Scott-Emuakpor

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Ultrasonic nanocrystal surface modification (UNSM) combined with localized laser heating (LA) were implemented to enhance the surface fatigue life of additively repaired Ti-6Al-4V alloy parts in this study. The effect of induced surface severe plastic deformation on microstructure development and grain refinement is analyzed. The results showed that surface metallurgical defects, hardness, residual stress, and roughness were significantly improved after LA-UNSM treatment. As a result of the improved surface textures and higher grain refinement, the fatigue life of the LA-UNSM treated samples was an order of magnitude longer. Surface free of pores and displaying a healthy topography provides evidence.

Original language	English
Article number	107663
Journal	International Journal of Fatigue
Volume	173
DOIs	https://doi.org/10.1016/j.ijfatigue.2023.107663
State	Published - Aug 2023
Externally published	Yes

Keywords

Directed energy deposition
Fatigue life
Laser assisted ultrasonic nanocrystal surface modification
Titanium alloys

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10.1016/j.ijfatigue.2023.107663

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title = "Improving fatigue life of additively repaired Ti-6Al-4V subjected to laser-assisted ultrasonic nanocrystal surface modification",

abstract = "Ultrasonic nanocrystal surface modification (UNSM) combined with localized laser heating (LA) were implemented to enhance the surface fatigue life of additively repaired Ti-6Al-4V alloy parts in this study. The effect of induced surface severe plastic deformation on microstructure development and grain refinement is analyzed. The results showed that surface metallurgical defects, hardness, residual stress, and roughness were significantly improved after LA-UNSM treatment. As a result of the improved surface textures and higher grain refinement, the fatigue life of the LA-UNSM treated samples was an order of magnitude longer. Surface free of pores and displaying a healthy topography provides evidence.",

keywords = "Directed energy deposition, Fatigue life, Laser assisted ultrasonic nanocrystal surface modification, Titanium alloys",

author = "Ojo, {Sammy A.} and Blake Bowser and Kannan Manigandan and Morscher, {Gregory N.} and Yalin Dong and Gyekenyesi, {Andrew L.} and Scott-Emuakpor, {Onome E.}",

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month = aug,

doi = "10.1016/j.ijfatigue.2023.107663",

language = "English",

volume = "173",

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TY - JOUR

T1 - Improving fatigue life of additively repaired Ti-6Al-4V subjected to laser-assisted ultrasonic nanocrystal surface modification

AU - Ojo, Sammy A.

AU - Bowser, Blake

AU - Manigandan, Kannan

AU - Morscher, Gregory N.

AU - Dong, Yalin

AU - Gyekenyesi, Andrew L.

AU - Scott-Emuakpor, Onome E.

PY - 2023/8

Y1 - 2023/8

N2 - Ultrasonic nanocrystal surface modification (UNSM) combined with localized laser heating (LA) were implemented to enhance the surface fatigue life of additively repaired Ti-6Al-4V alloy parts in this study. The effect of induced surface severe plastic deformation on microstructure development and grain refinement is analyzed. The results showed that surface metallurgical defects, hardness, residual stress, and roughness were significantly improved after LA-UNSM treatment. As a result of the improved surface textures and higher grain refinement, the fatigue life of the LA-UNSM treated samples was an order of magnitude longer. Surface free of pores and displaying a healthy topography provides evidence.

AB - Ultrasonic nanocrystal surface modification (UNSM) combined with localized laser heating (LA) were implemented to enhance the surface fatigue life of additively repaired Ti-6Al-4V alloy parts in this study. The effect of induced surface severe plastic deformation on microstructure development and grain refinement is analyzed. The results showed that surface metallurgical defects, hardness, residual stress, and roughness were significantly improved after LA-UNSM treatment. As a result of the improved surface textures and higher grain refinement, the fatigue life of the LA-UNSM treated samples was an order of magnitude longer. Surface free of pores and displaying a healthy topography provides evidence.

KW - Directed energy deposition

KW - Fatigue life

KW - Laser assisted ultrasonic nanocrystal surface modification

KW - Titanium alloys

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DO - 10.1016/j.ijfatigue.2023.107663

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ER -

Improving fatigue life of additively repaired Ti-6Al-4V subjected to laser-assisted ultrasonic nanocrystal surface modification

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Keywords

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