Small fatigue crack propagation rate and behaviours in a powder metallurgy superalloy: Role of stress ratio and local microstructure

Qinzheng Yang; Xiaoguang Yang; Weiqing Huang; Yi Shi; Duoqi Shi

doi:10.1016/j.ijfatigue.2022.106861

Small fatigue crack propagation rate and behaviours in a powder metallurgy superalloy: Role of stress ratio and local microstructure

Qinzheng Yang, Xiaoguang Yang^*, Weiqing Huang, Yi Shi, Duoqi Shi

^*Corresponding author for this work

School of Mechanical Engineering

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

16 Citations (Scopus)

Abstract

The role of stress ratio and local microstructure on small crack propagation (0.065–1.0 mm) behaviours in superalloy FGH4096 were investigated using the Photomicroscopy method. ΔK correlated the growth rates of small cracks with different stress ratios well, which is attributed to the low crack closure level. Statistical and crystallographic analysis revealed that grain boundaries resulted in crack temporary arrests, which is independent of loading conditions and crack length. Temporarily arrested cracks propagated further by connecting to the secondary crack that initiated on the slip plane that parallels to the twin boundary or in the grain with a local highest Taylor factor.

Original language	English
Article number	106861
Journal	International Journal of Fatigue
Volume	160
DOIs	https://doi.org/10.1016/j.ijfatigue.2022.106861
Publication status	Published - Jul 2022

Keywords

Crack arrest
Grain boundary
Powder metallurgy superalloy
Small fatigue crack
Stress ratio

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10.1016/j.ijfatigue.2022.106861

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title = "Small fatigue crack propagation rate and behaviours in a powder metallurgy superalloy: Role of stress ratio and local microstructure",

abstract = "The role of stress ratio and local microstructure on small crack propagation (0.065–1.0 mm) behaviours in superalloy FGH4096 were investigated using the Photomicroscopy method. ΔK correlated the growth rates of small cracks with different stress ratios well, which is attributed to the low crack closure level. Statistical and crystallographic analysis revealed that grain boundaries resulted in crack temporary arrests, which is independent of loading conditions and crack length. Temporarily arrested cracks propagated further by connecting to the secondary crack that initiated on the slip plane that parallels to the twin boundary or in the grain with a local highest Taylor factor.",

keywords = "Crack arrest, Grain boundary, Powder metallurgy superalloy, Small fatigue crack, Stress ratio",

author = "Qinzheng Yang and Xiaoguang Yang and Weiqing Huang and Yi Shi and Duoqi Shi",

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AU - Yang, Qinzheng

AU - Yang, Xiaoguang

AU - Huang, Weiqing

AU - Shi, Yi

AU - Shi, Duoqi

PY - 2022/7

Y1 - 2022/7

N2 - The role of stress ratio and local microstructure on small crack propagation (0.065–1.0 mm) behaviours in superalloy FGH4096 were investigated using the Photomicroscopy method. ΔK correlated the growth rates of small cracks with different stress ratios well, which is attributed to the low crack closure level. Statistical and crystallographic analysis revealed that grain boundaries resulted in crack temporary arrests, which is independent of loading conditions and crack length. Temporarily arrested cracks propagated further by connecting to the secondary crack that initiated on the slip plane that parallels to the twin boundary or in the grain with a local highest Taylor factor.

AB - The role of stress ratio and local microstructure on small crack propagation (0.065–1.0 mm) behaviours in superalloy FGH4096 were investigated using the Photomicroscopy method. ΔK correlated the growth rates of small cracks with different stress ratios well, which is attributed to the low crack closure level. Statistical and crystallographic analysis revealed that grain boundaries resulted in crack temporary arrests, which is independent of loading conditions and crack length. Temporarily arrested cracks propagated further by connecting to the secondary crack that initiated on the slip plane that parallels to the twin boundary or in the grain with a local highest Taylor factor.

KW - Crack arrest

KW - Grain boundary

KW - Powder metallurgy superalloy

KW - Small fatigue crack

KW - Stress ratio

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VL - 160

JO - International Journal of Fatigue

JF - International Journal of Fatigue

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Small fatigue crack propagation rate and behaviours in a powder metallurgy superalloy: Role of stress ratio and local microstructure

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Keywords

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