High-frequency metal fatigue: The high cycle fatigue behavior of ULTIMET® alloy

L. Jiang; C. R. Brooks; P. K. Liaw; Hsin Wang; Claudia J. Rawn; D. L. Klarstrom

doi:10.1016/S0921-5093(00)01928-6

High-frequency metal fatigue: The high cycle fatigue behavior of ULTIMET_® alloy

L. Jiang, C. R. Brooks, P. K. Liaw, Hsin Wang, Claudia J. Rawn, D. L. Klarstrom

Nuclear Energy Materials Microanalysis

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

34 Scopus citations

Abstract

ULTIMET^® alloy is a relatively new commercial Co-26Cr-9Ni (wt.%) alloy, which exhibits good resistance to both wear and corrosion. A state-of-the-art high-frequency, 1000-Hz, material test system was used to study the high-cycle fatigue behavior of ULTIMET alloy up to 10⁹ cycles. Fatigue experiments were conducted at high (1000 Hz) and conventional (20 Hz) frequencies in air at room temperature. The effects of the test frequency, the temperature increase during fatigue, and the change of crack initiation sites from the surface to subsurface on fatigue life are discussed. Although the fatigue life was comparable at test frequencies of 1000 and 20 Hz, the equilibrium temperature at 1000 Hz was considerably higher than that at 20 Hz. The fractographic study showed different morphologies of fracture surfaces at various frequencies. The high-cycle fatigue behavior of ULTIMET alloy at both high- and low-frequencies exhibited a typical two-stage fatigue-crack-growth process, i.e., (a) stage I fatigue-crack initiation in which the cracks formed on those planes most closely aligned with the maximum shear-stress direction in the grains of the fatigue specimen; and (b) stage II fatigue-crack growth in which the maximum principal tensile stress controlled crack propagation in the region of the crack tip.

Original language	English
Pages (from-to)	162-175
Number of pages	14
Journal	Materials Science and Engineering: A
Volume	314
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-5093(00)01928-6
State	Published - Sep 15 2001

Funding

This work is supported by the Haynes International, Inc. We also acknowledge the financial support of the National Science Foundation, the Division of Design, Manufacture, and Industrial Innovation, under Grant No. DMI-9724476, the Combined Research-Curriculum Development Program, under EEC-9527527, and the Integrative Graduate Education and Research Training Program, under DGE-9987548, to the University of Tennessee, Knoxville, with Dr Delcle R. Durham, Mary Poats, and Dr Wyn Jennings as program managers, respectively. We appreciate the financial support of the Center for Materials Processing and Office of Research Administration at the University of Tennessee, Knoxville. Many thanks are due to Doug Fielden, Greg Jones, and Larry Smith at the University of Tennessee, Knoxville, for their great help in setting up the electrohydraulic machines and excellent technical support.

Keywords

Cobalt-based alloy
Crack initiation
High-cycle fatigue
High-frequency
Temperature increase

Access to Document

10.1016/S0921-5093(00)01928-6

Cite this

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title = "High-frequency metal fatigue: The high cycle fatigue behavior of ULTIMET{\textregistered} alloy",

abstract = "ULTIMET{\textregistered} alloy is a relatively new commercial Co-26Cr-9Ni (wt.%) alloy, which exhibits good resistance to both wear and corrosion. A state-of-the-art high-frequency, 1000-Hz, material test system was used to study the high-cycle fatigue behavior of ULTIMET alloy up to 109 cycles. Fatigue experiments were conducted at high (1000 Hz) and conventional (20 Hz) frequencies in air at room temperature. The effects of the test frequency, the temperature increase during fatigue, and the change of crack initiation sites from the surface to subsurface on fatigue life are discussed. Although the fatigue life was comparable at test frequencies of 1000 and 20 Hz, the equilibrium temperature at 1000 Hz was considerably higher than that at 20 Hz. The fractographic study showed different morphologies of fracture surfaces at various frequencies. The high-cycle fatigue behavior of ULTIMET alloy at both high- and low-frequencies exhibited a typical two-stage fatigue-crack-growth process, i.e., (a) stage I fatigue-crack initiation in which the cracks formed on those planes most closely aligned with the maximum shear-stress direction in the grains of the fatigue specimen; and (b) stage II fatigue-crack growth in which the maximum principal tensile stress controlled crack propagation in the region of the crack tip.",

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AU - Jiang, L.

AU - Brooks, C. R.

AU - Liaw, P. K.

AU - Wang, Hsin

AU - Rawn, Claudia J.

AU - Klarstrom, D. L.

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N2 - ULTIMET® alloy is a relatively new commercial Co-26Cr-9Ni (wt.%) alloy, which exhibits good resistance to both wear and corrosion. A state-of-the-art high-frequency, 1000-Hz, material test system was used to study the high-cycle fatigue behavior of ULTIMET alloy up to 109 cycles. Fatigue experiments were conducted at high (1000 Hz) and conventional (20 Hz) frequencies in air at room temperature. The effects of the test frequency, the temperature increase during fatigue, and the change of crack initiation sites from the surface to subsurface on fatigue life are discussed. Although the fatigue life was comparable at test frequencies of 1000 and 20 Hz, the equilibrium temperature at 1000 Hz was considerably higher than that at 20 Hz. The fractographic study showed different morphologies of fracture surfaces at various frequencies. The high-cycle fatigue behavior of ULTIMET alloy at both high- and low-frequencies exhibited a typical two-stage fatigue-crack-growth process, i.e., (a) stage I fatigue-crack initiation in which the cracks formed on those planes most closely aligned with the maximum shear-stress direction in the grains of the fatigue specimen; and (b) stage II fatigue-crack growth in which the maximum principal tensile stress controlled crack propagation in the region of the crack tip.

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