Effect of load ratio and corrosion on fatigue behavior of AerMet100 ultrahigh strength steel

Song Mei Li; Ling Fei Wu; Jian Hua Liu; Mei Yu; Chen Wen

doi:10.11868/j.issn.1005-5053.2014.3.012

Effect of load ratio and corrosion on fatigue behavior of AerMet100 ultrahigh strength steel

Song Mei Li^*
, Ling Fei Wu
, Jian Hua Liu
, Mei Yu
, Chen Wen

^*Corresponding author for this work

School of Materials Science and Engineering

Beihang University

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

15 Scopus citations

Abstract

The effects of load ratio and environment on the fatigue crack growth (FCG) behaviors of AerMet 100 steel was studied. Different crack growth zones were focused. The fracture morphologies were observed by scanning electron microscope (SEM). The results show that raising the load ratio reduces the threshold stress intensity (ΔKth), below 10^-5 mm/cycle. Further more, ΔKth became a constant at R≥0.5. However, the effect of load ratio on FCG rate is slight above 10^-5 mm/cycle. It tended to be converge in the range. And the corrosion environments accelerate the FCG above 10^-5 mm/cycle. When the rate below 10^-5 mm/cycle, the situation is changed. The aggressive environment reduces the FCG rate, and the threshold-value of FCG is larger due to the crack closure of corrosion.

Original language	English
Pages (from-to)	74-80
Number of pages	7
Journal	Journal of Aeronautical Materials
Volume	34
Issue number	3
DOIs	https://doi.org/10.11868/j.issn.1005-5053.2014.3.012
State	Published - Jun 2014

Keywords

Corrosion fatigue
Crack closure
Load ratio
Threshold value
Ultrahigh strength steel

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10.11868/j.issn.1005-5053.2014.3.012

Cite this

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title = "Effect of load ratio and corrosion on fatigue behavior of AerMet100 ultrahigh strength steel",

abstract = "The effects of load ratio and environment on the fatigue crack growth (FCG) behaviors of AerMet 100 steel was studied. Different crack growth zones were focused. The fracture morphologies were observed by scanning electron microscope (SEM). The results show that raising the load ratio reduces the threshold stress intensity (ΔKth), below 10-5 mm/cycle. Further more, ΔKth became a constant at R≥0.5. However, the effect of load ratio on FCG rate is slight above 10-5 mm/cycle. It tended to be converge in the range. And the corrosion environments accelerate the FCG above 10-5 mm/cycle. When the rate below 10-5 mm/cycle, the situation is changed. The aggressive environment reduces the FCG rate, and the threshold-value of FCG is larger due to the crack closure of corrosion.",

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author = "Li, \{Song Mei\} and Wu, \{Ling Fei\} and Liu, \{Jian Hua\} and Mei Yu and Chen Wen",

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T1 - Effect of load ratio and corrosion on fatigue behavior of AerMet100 ultrahigh strength steel

AU - Li, Song Mei

AU - Wu, Ling Fei

AU - Liu, Jian Hua

AU - Yu, Mei

AU - Wen, Chen

PY - 2014/6

Y1 - 2014/6

N2 - The effects of load ratio and environment on the fatigue crack growth (FCG) behaviors of AerMet 100 steel was studied. Different crack growth zones were focused. The fracture morphologies were observed by scanning electron microscope (SEM). The results show that raising the load ratio reduces the threshold stress intensity (ΔKth), below 10-5 mm/cycle. Further more, ΔKth became a constant at R≥0.5. However, the effect of load ratio on FCG rate is slight above 10-5 mm/cycle. It tended to be converge in the range. And the corrosion environments accelerate the FCG above 10-5 mm/cycle. When the rate below 10-5 mm/cycle, the situation is changed. The aggressive environment reduces the FCG rate, and the threshold-value of FCG is larger due to the crack closure of corrosion.

AB - The effects of load ratio and environment on the fatigue crack growth (FCG) behaviors of AerMet 100 steel was studied. Different crack growth zones were focused. The fracture morphologies were observed by scanning electron microscope (SEM). The results show that raising the load ratio reduces the threshold stress intensity (ΔKth), below 10-5 mm/cycle. Further more, ΔKth became a constant at R≥0.5. However, the effect of load ratio on FCG rate is slight above 10-5 mm/cycle. It tended to be converge in the range. And the corrosion environments accelerate the FCG above 10-5 mm/cycle. When the rate below 10-5 mm/cycle, the situation is changed. The aggressive environment reduces the FCG rate, and the threshold-value of FCG is larger due to the crack closure of corrosion.

KW - Corrosion fatigue

KW - Crack closure

KW - Load ratio

KW - Threshold value

KW - Ultrahigh strength steel

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DO - 10.11868/j.issn.1005-5053.2014.3.012

M3 - 文章

AN - SCOPUS:84902956522

SN - 1005-5053

VL - 34

SP - 74

EP - 80

JO - Journal of Aeronautical Materials

JF - Journal of Aeronautical Materials

IS - 3

ER -

Effect of load ratio and corrosion on fatigue behavior of AerMet100 ultrahigh strength steel

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Keywords

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