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TECHNICAL PAPERS

An Investigation of the Effects of Microstructure on Fatigue Crack Growth in Ti-6242

[+] Author and Article Information
F. McBagonluri

Department of Materials Engineering, University of Dayton, Dayton, OH

E. Akpan

Department of Mechanical Engineering, Drexel University, Philadelphia, PA

C. Mercer

Materials Department, University of California, Santa Barbara, CA

W. Shen

Princeton Materials Institute, Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ

W. O. Soboyejo

Princeton Materials Institute, Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ

J. Eng. Mater. Technol 127(1), 46-57 (Feb 22, 2005) (12 pages) doi:10.1115/1.1836771 History: Received January 01, 2003; Revised September 14, 2004; Online February 22, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic illustration of the nucleation of cleavage fracture from dislocation pile-up at grain boundaries (taken from Ref. 6)
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Ti-6242 microstructural morphologies: (a) equiaxed microstructure (microstructure 1); (b) elongated microstructure (microstructure 2); and (c) colony microstructure (microstructure 3)
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Dimensions of smooth hourglass specimen
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Schematic of beachmarking load profiles (a) pure fatigue waveform
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Beachmarks on long through-thickness cracks in (a) equiaxed structure (microstructure 1); (b) elongated structure (microstructure 2); and (c) colony structure (microstructure 3)
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Comparison of long fatigue crack growth rate data obtained from SENB specimens
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Fatigue fracture modes in microstructure 1: (a) subsurface crack nucleation; (b) crack growth by cleavage; (c) transition from cleavage to striation; (d) fatigue striations; (e) fatigue striation plus dimples; (f) final fracture
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Fatigue fracture modes in microstructure 2: (a) subsurface crack nucleation; (b) crack growth by cleavage; (c) transition from cleavage to striation; (d) fatigue striations; (e) fatigue striation plus dimples; (f) final fracture
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Fatigue fracture modes in microstructure 3: (a) subsurface crack nucleation; (b) crack growth by cleavage; (c) transition from cleavage to striation; (d) fatigue striations; (e) fatigue striation plus dimples; (f) final fracture
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Possible crack profiles and crack shape parameters: (a) typical optical photomicrograph; (b) schematics of possible crack profiles
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Plots of crack aspect ratio, (c/a), versus number of fatigue cycles: (a) equixed microstructure; (b) elongated microstructure; (c) colony microstructure
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(a) Comparison of semielliptical and through thickness crack growth rate data obtained for microstructure 1; (b) comparison of semielliptical and through thickness crack growth rate data obtained for microstructure 2; (c) comparison of semielliptical and through thickness crack growth rate data obtained for microstructure 3
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Schematic illustration of possible crack extension schemes: (a) surface crack from section; (b) subsurface initial crack; (c) surface crack in hourglass section
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Comparison of predicted and experimental depth crack evolution: (a) equiaxed microstructure; (b) elongated microstructure; (c) colony microstructure
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Comparison of predicted and experimental surface crack length evolution: (a) equixed microstructure; (b) elongated microstructure and (c) colony microstructure
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Comparison of experimental and predicted average crack shape evolution: (a) equiaxed microstructure; (b) elongated microstructure, (c) colony microstructure

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