Microstructural and load hold effects on small fatigue crack growth in α+β dual phase Ti alloys

S. Hémery; J. C. Stinville

doi:10.1016/j.ijfatigue.2021.106699

Microstructural and load hold effects on small fatigue crack growth in α+β dual phase Ti alloys

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

Abstract

Microstructurally small crack growth was monitored in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo with equiaxed and bi-modal microstructures. The influence of the microstructure was assessed to obtain an improved understanding of the lifetime variability observed in Ti alloys. Primary α grains, basal plane cracking and misalignment across boundaries were identified as key features for high crack growth rates. The origin of life debits encountered under dwell-fatigue loadings was also investigated through crack growth monitoring with the introduction of load holds at peaks stress. Dwell periods were found to induce a substantial small crack acceleration.

Original language	English (US)
Article number	106699
Journal	International Journal of Fatigue
Volume	156
DOIs	https://doi.org/10.1016/j.ijfatigue.2021.106699
State	Published - Mar 2022

Keywords

Dwell-fatigue
Fatigue crack growth
Low cycle fatigue
Microstructure
Titanium alloys

ASJC Scopus subject areas

Modeling and Simulation
General Materials Science
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

Online availability

10.1016/j.ijfatigue.2021.106699

Library availability

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title = "Microstructural and load hold effects on small fatigue crack growth in α+β dual phase Ti alloys",

abstract = "Microstructurally small crack growth was monitored in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo with equiaxed and bi-modal microstructures. The influence of the microstructure was assessed to obtain an improved understanding of the lifetime variability observed in Ti alloys. Primary α grains, basal plane cracking and misalignment across boundaries were identified as key features for high crack growth rates. The origin of life debits encountered under dwell-fatigue loadings was also investigated through crack growth monitoring with the introduction of load holds at peaks stress. Dwell periods were found to induce a substantial small crack acceleration.",

keywords = "Dwell-fatigue, Fatigue crack growth, Low cycle fatigue, Microstructure, Titanium alloys",

author = "S. H{\'e}mery and Stinville, {J. C.}",

note = "This work has been partially supported by « Nouvelle Aquitaine » Region and by European Structural and Investment Funds (ERDF reference : P-2016-BAFE-94/95). Pprime Institute gratefully acknowledges “Contrat de Plan Etat - R{\'e}gion Nouvelle-Aquitaine” (CPER) as well as the “Fonds Europ{\'e}en de D{\'e}veloppement R{\'e}gional (FEDER)” for their financial support to the reported work. T. Pollock is acknowledged for her support. J.C.S. is grateful for financial support from startup funds provided by the Department of Materials Science and Engineering at University of Illinois at Urbana-Champaign.",

year = "2022",

month = mar,

doi = "10.1016/j.ijfatigue.2021.106699",

language = "English (US)",

volume = "156",

journal = "International Journal of Fatigue",

issn = "0142-1123",

publisher = "Elsevier Ltd",

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TY - JOUR

T1 - Microstructural and load hold effects on small fatigue crack growth in α+β dual phase Ti alloys

AU - Hémery, S.

AU - Stinville, J. C.

N1 - This work has been partially supported by « Nouvelle Aquitaine » Region and by European Structural and Investment Funds (ERDF reference : P-2016-BAFE-94/95). Pprime Institute gratefully acknowledges “Contrat de Plan Etat - Région Nouvelle-Aquitaine” (CPER) as well as the “Fonds Européen de Développement Régional (FEDER)” for their financial support to the reported work. T. Pollock is acknowledged for her support. J.C.S. is grateful for financial support from startup funds provided by the Department of Materials Science and Engineering at University of Illinois at Urbana-Champaign.

PY - 2022/3

Y1 - 2022/3

N2 - Microstructurally small crack growth was monitored in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo with equiaxed and bi-modal microstructures. The influence of the microstructure was assessed to obtain an improved understanding of the lifetime variability observed in Ti alloys. Primary α grains, basal plane cracking and misalignment across boundaries were identified as key features for high crack growth rates. The origin of life debits encountered under dwell-fatigue loadings was also investigated through crack growth monitoring with the introduction of load holds at peaks stress. Dwell periods were found to induce a substantial small crack acceleration.

AB - Microstructurally small crack growth was monitored in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo with equiaxed and bi-modal microstructures. The influence of the microstructure was assessed to obtain an improved understanding of the lifetime variability observed in Ti alloys. Primary α grains, basal plane cracking and misalignment across boundaries were identified as key features for high crack growth rates. The origin of life debits encountered under dwell-fatigue loadings was also investigated through crack growth monitoring with the introduction of load holds at peaks stress. Dwell periods were found to induce a substantial small crack acceleration.

KW - Dwell-fatigue

KW - Fatigue crack growth

KW - Low cycle fatigue

KW - Microstructure

KW - Titanium alloys

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Microstructural and load hold effects on small fatigue crack growth in α+β dual phase Ti alloys

Abstract

Keywords

ASJC Scopus subject areas

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