Fatigue Improvement of Additive Manufactured Ti–TiB Material through Shot Peening

In this work, fatigue improvement through shot peening of an additive manufactured Ti–TiB block produced through Plasma Transferred Arc Solid Free-Form Fabrication (PTA-SFFF) was investigated. The microstructure and composition were explored through analytical microscopy techniques such as scanning...

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Bibliographic Details
Published in:Metals (Basel ) 2021-09, Vol.11 (9), p.1423
Main Authors: DiCecco, Liza-Anastasia, Mehdi, Mehdi, Edrisy, Afsaneh
Format: Article
Language:English
Subjects:
additive manufacturing
Cost control
Electron backscatter diffraction
fatigue
Fatigue life
Fatigue strength
Fatigue tests
Freeform fabrication
Manufacturing
Materials fatigue
Mechanical properties
Microscopy
Microstructure
Rotating machinery
Scanning electron microscopy
Shot peening
Solid free form fabrication
Spectrum analysis
Tensile tests
titanium matrix composite
Ti–TiB
Ultimate tensile strength
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Summary:In this work, fatigue improvement through shot peening of an additive manufactured Ti–TiB block produced through Plasma Transferred Arc Solid Free-Form Fabrication (PTA-SFFF) was investigated. The microstructure and composition were explored through analytical microscopy techniques such as scanning and transmission electron microscopy (SEM, TEM) and electron backscatter diffraction (EBSD). To investigate the isotropic behavior within the additive manufactured Ti–TiB blocks, tensile tests were conducted in longitudinal, diagonal, and lateral directions. A consistent tensile behavior was observed for all the directions, highlighting a nearly isotropic behavior within samples. Shot peening was introduced as a postmanufacturing treatment to enhance the mechanical properties of AM specimens. Shot peening led to a localized increase in hardness at the near-surface where stress-induced twins are noted within the affected microstructure. The RBF-200 HT rotating-beam fatigue machine was utilized to conduct fatigue testing on untreated and shot-peened samples, starting at approximately 1/2 the ultimate tensile strength of the bulk material and testing within low- (105 cycles) regimes. Shot-peened samples experienced significant improvement in fatigue life, increasing the fitted endurance limit from 247.8 MPa for the untreated samples to 318.3 MPa, leading to an increase in fatigue resistance of approximately 28%.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11091423