Effects of deformation behavior on fatigue fracture surface morphology in a nickel-base superalloy

A. Shyam; W. W. Milligan

doi:10.1016/j.actamat.2003.11.032

Effects of deformation behavior on fatigue fracture surface morphology in a nickel-base superalloy

A. Shyam, W. W. Milligan

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

53 Scopus citations

Abstract

Fatigue crack propagation fracture surface morphologies in nickel-base superalloys vary substantially with changes in loading parameters such as temperature, ΔK, load ratio, frequency, and additionally microstructure. Quantitative fracture surface roughness can vary from sub-micron levels to a maximum value of approximately half the grain size. Atomic Force Microscope studies of surface slip traces in compression specimens revealed a clear relationship between slip homogeneity in compression testing and fracture surface roughness under similar fatigue loading conditions. It has been shown in this study that changes in ΔK, strain level, temperature, grain size, and load ratio can all affect slip heterogeneity, which in turn controls the fracture surface roughness. Finally, a model is developed that quantitatively predicts fracture surface roughness and roughness-induced crack closure stress intensity values from measurements of slip line spacing in a compression specimen.

Original language	English
Pages (from-to)	1503-1513
Number of pages	11
Journal	Acta Materialia
Volume	52
Issue number	6
DOIs	https://doi.org/10.1016/j.actamat.2003.11.032
State	Published - Apr 5 2004
Externally published	Yes

Funding

This work was supported by the MURI on High Cycle Fatigue, funded at Michigan Technological University by the Air Force Office of Scientific Research, Grant No. F49620-96-1-0478, through a subcontract from the University of California at Berkeley. We thank Professor Jaroslaw Drelich and Mr. Garth Tormoen for assistance with the Atomic Force Microscope, and Mr. Sotirios Marras for assistance with Stereomicroscopy. We gratefully acknowledge Dr. Timothy Gabb of NASA-Glenn Research Center for providing the constant strain range fatigue tested specimen.

Funders	Funder number
Air Force Office of Scientific Research	F49620-96-1-0478
University of California Berkeley
Michigan Technological University
Multidisciplinary University Research Initiative

Keywords

Deformation
High cycle fatigue
Nickel alloys
Stereomicroscopy

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10.1016/j.actamat.2003.11.032

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abstract = "Fatigue crack propagation fracture surface morphologies in nickel-base superalloys vary substantially with changes in loading parameters such as temperature, ΔK, load ratio, frequency, and additionally microstructure. Quantitative fracture surface roughness can vary from sub-micron levels to a maximum value of approximately half the grain size. Atomic Force Microscope studies of surface slip traces in compression specimens revealed a clear relationship between slip homogeneity in compression testing and fracture surface roughness under similar fatigue loading conditions. It has been shown in this study that changes in ΔK, strain level, temperature, grain size, and load ratio can all affect slip heterogeneity, which in turn controls the fracture surface roughness. Finally, a model is developed that quantitatively predicts fracture surface roughness and roughness-induced crack closure stress intensity values from measurements of slip line spacing in a compression specimen.",

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AB - Fatigue crack propagation fracture surface morphologies in nickel-base superalloys vary substantially with changes in loading parameters such as temperature, ΔK, load ratio, frequency, and additionally microstructure. Quantitative fracture surface roughness can vary from sub-micron levels to a maximum value of approximately half the grain size. Atomic Force Microscope studies of surface slip traces in compression specimens revealed a clear relationship between slip homogeneity in compression testing and fracture surface roughness under similar fatigue loading conditions. It has been shown in this study that changes in ΔK, strain level, temperature, grain size, and load ratio can all affect slip heterogeneity, which in turn controls the fracture surface roughness. Finally, a model is developed that quantitatively predicts fracture surface roughness and roughness-induced crack closure stress intensity values from measurements of slip line spacing in a compression specimen.

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Effects of deformation behavior on fatigue fracture surface morphology in a nickel-base superalloy

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