Microstructural effects on the high-cycle fatigue and fracture behaviors of Ti-6Al-4V alloy

Zhihong Wu; Hongchao Kou; Luyao Tang; Wei Chen; Xiaoning Han; Ying Deng; Bin Tang; Jinshan Li

doi:10.1016/j.engfracmech.2020.107129

Microstructural effects on the high-cycle fatigue and fracture behaviors of Ti-6Al-4V alloy

Zhihong Wu, Hongchao Kou, Luyao Tang, Wei Chen, Xiaoning Han, Ying Deng, Bin Tang, Jinshan Li

School of Materials Sience and Engineering

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

19 Scopus citations

Abstract

In this work, the samples of Ti-6Al-4V alloy are fatigued at room temperature (RT) and 400 ℃ to reveal the effect of microstructure on high-cycle fatigue behaviors. Results show that the RT fatigue strength monotonically increases with increasing primary α (α_p) percentage, while a moderate α_p percentage shows slightly higher fatigue strength value at 400 ℃. Ti-6Al-4V with 45–60% α_p exhibit relatively long fatigue life and small scatter in fatigue data. The crack-initiation sites of RT failed specimens show isolated or contiguous α_p facets. Fatigue steps associated with the multiple crack-initiation are observed in 400 ℃ failed specimens.

Original language	English
Article number	107129
Journal	Engineering Fracture Mechanics
Volume	235
DOIs	https://doi.org/10.1016/j.engfracmech.2020.107129
State	Published - Aug 2020

Keywords

Fractography
High cycle fatigue
Microstructure
S-N curves
Titanium alloys

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10.1016/j.engfracmech.2020.107129

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title = "Microstructural effects on the high-cycle fatigue and fracture behaviors of Ti-6Al-4V alloy",

abstract = "In this work, the samples of Ti-6Al-4V alloy are fatigued at room temperature (RT) and 400 ℃ to reveal the effect of microstructure on high-cycle fatigue behaviors. Results show that the RT fatigue strength monotonically increases with increasing primary α (αp) percentage, while a moderate αp percentage shows slightly higher fatigue strength value at 400 ℃. Ti-6Al-4V with 45–60% αp exhibit relatively long fatigue life and small scatter in fatigue data. The crack-initiation sites of RT failed specimens show isolated or contiguous αp facets. Fatigue steps associated with the multiple crack-initiation are observed in 400 ℃ failed specimens.",

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T1 - Microstructural effects on the high-cycle fatigue and fracture behaviors of Ti-6Al-4V alloy

AU - Wu, Zhihong

AU - Kou, Hongchao

AU - Tang, Luyao

AU - Chen, Wei

AU - Han, Xiaoning

AU - Deng, Ying

AU - Tang, Bin

AU - Li, Jinshan

PY - 2020/8

Y1 - 2020/8

N2 - In this work, the samples of Ti-6Al-4V alloy are fatigued at room temperature (RT) and 400 ℃ to reveal the effect of microstructure on high-cycle fatigue behaviors. Results show that the RT fatigue strength monotonically increases with increasing primary α (αp) percentage, while a moderate αp percentage shows slightly higher fatigue strength value at 400 ℃. Ti-6Al-4V with 45–60% αp exhibit relatively long fatigue life and small scatter in fatigue data. The crack-initiation sites of RT failed specimens show isolated or contiguous αp facets. Fatigue steps associated with the multiple crack-initiation are observed in 400 ℃ failed specimens.

AB - In this work, the samples of Ti-6Al-4V alloy are fatigued at room temperature (RT) and 400 ℃ to reveal the effect of microstructure on high-cycle fatigue behaviors. Results show that the RT fatigue strength monotonically increases with increasing primary α (αp) percentage, while a moderate αp percentage shows slightly higher fatigue strength value at 400 ℃. Ti-6Al-4V with 45–60% αp exhibit relatively long fatigue life and small scatter in fatigue data. The crack-initiation sites of RT failed specimens show isolated or contiguous αp facets. Fatigue steps associated with the multiple crack-initiation are observed in 400 ℃ failed specimens.

KW - Fractography

KW - High cycle fatigue

KW - Microstructure

KW - S-N curves

KW - Titanium alloys

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DO - 10.1016/j.engfracmech.2020.107129

M3 - 文章

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JO - Engineering Fracture Mechanics

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Microstructural effects on the high-cycle fatigue and fracture behaviors of Ti-6Al-4V alloy

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Keywords

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