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

Materials Joining

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

16 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

Funding

The materials investigated in this work were provided by the Ohio Aerospace Institute (OAI) (Cleveland, Ohio) and USAF/AFMC, AFRL [Air Force Materials Command (AFMC)] and Air Force Research Laboratory (AFRL) at Wright Patterson Air Force Base (Dayton, Ohio, USA). Their supports are gratefully acknowledged.

Keywords

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

Access to Document

10.1016/j.ijfatigue.2023.107663

Cite this

@article{f3ed66171def48089cd6778dfe46ca60,

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.\}",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd",

year = "2023",

month = aug,

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

language = "English",

volume = "173",

journal = "International Journal of Fatigue",

issn = "0142-1123",

publisher = "Elsevier",

}

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

UR - http://www.scopus.com/inward/record.url?scp=85152601673&partnerID=8YFLogxK

U2 - 10.1016/j.ijfatigue.2023.107663

DO - 10.1016/j.ijfatigue.2023.107663

M3 - Article

AN - SCOPUS:85152601673

SN - 0142-1123

VL - 173

JO - International Journal of Fatigue

JF - International Journal of Fatigue

M1 - 107663

ER -

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

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this