The role of crack origin size and early stage crack growth on high cycle fatigue of powder metallurgy Ti-6Al-4V alloy

•Fatigue behavior and failure of Ti-6Al-4V alloys with pores.•The role of crack origin size and early crack growth propagation on HCF.•Early stage internal crack growth rate from pore/facet is 10−12−10−10 m/cycle.•Predict HCF life from crack origin size and early crack propagation rate. In this work...

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Bibliographic Details
Published inInternational journal of fatigue Vol. 102; no. C; pp. 48 - 58
Main Authors Cao, Fei, Ravi Chandran, K.S.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.09.2017
Elsevier BV
Elsevier
Subjects
Crack initiation
Crack propagation
Fatigue failure
Fatigue life
Fracture mechanics
High cycle fatigue
Inhomogeneity
Materials fatigue
Metallurgy
Powder metallurgy
Short crack growth
Titanium
Titanium base alloys
Titanium
Short crack growth
Powder metallurgy
High cycle fatigue
Crack initiation
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Summary:•Fatigue behavior and failure of Ti-6Al-4V alloys with pores.•The role of crack origin size and early crack growth propagation on HCF.•Early stage internal crack growth rate from pore/facet is 10−12−10−10 m/cycle.•Predict HCF life from crack origin size and early crack propagation rate. In this work, fatigue failure mode, crack initiation, and early stage crack growth mechanism in Ti-6Al-4V alloys with different levels of microstructural inhomogeneity were investigated. The quantitative correlations between fatigue life, crack origin size, and early stage short crack growth, were analyzed and discussed. The interior early stage short crack growth rate was determined to be 10−12–10−10m/cycle. The high and very high cycle fatigue lives predicted based on crack initiation site size and early stage short crack growth rate agree well with real fatigue data.
Bibliography:USDOE
DEEE0005761
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2017.05.004