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TECHNICAL PAPERS: Gas Turbines: Manufacturing, Materials, and Metallurgy

Mechanical Properties of Overaluminized MCrAlY Coatings at Room Temperature

[+] Author and Article Information
Yoshiyasu Itoh, Masahiro Saitoh

Power and Industrial Systems R&D Center, Toshiba Corporation, 2-4, Suehiro-cho, Tsurumi-ku, 230-0045 Yokohama, Japan

J. Eng. Gas Turbines Power 127(4), 807-813 (Sep 20, 2005) (7 pages) doi:10.1115/1.1688766 History: Received October 01, 2000; Revised December 01, 2002; Online September 20, 2005
Copyright © 2005 by ASME
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References

Bettridge,  D. F., and Ubank,  R. G., 1986, “Quality Control of High-Temperature Protective Coatings,” Mater. Sci. Technol., 2, pp. 232–242.
Mevrel,  R., 1989, “State of the Art on High-Temperature Corrosion-Resistant Coatings,” Mater. Sci. Eng., A, A120, pp. 12–24.
Das,  D. K., Singh,  Y., and Joshi,  S. V., 1998, “Evolution of Aluminide Coating Microstructure on Nickel-Base Cast Superalloy CM-247 in a Single-Step High-Activity Aluminizing Process,” Metall. Mater. Trans. A, 29A, pp. 2173–2188.
Cheruvu,  N. S., Chan,  K. S., and Leverant,  G. R., 2000, “Cyclic Oxidation Behavior of Aluminide, Platinum Modified Aluminide and MCrAlY Coatings on GTD-111,” ASME J. Eng. Gas Turbines Power, 122, pp. 50–54.
Miller,  A. M., 1987, “Current States of Thermal Barriar Coatimgs—An Overview,” Surf. Coat. Technol., 30, pp. 1–11.
Wortman,  D. J., Nagaraj,  B. A., and Duderstadt,  E. C., 1989, “Thermal Barriar Coatings for Gas Turbines Use,” Mater. Sci. Eng., A, A121, pp. 433–440.
Wu,  B. C., Chao,  C. H., and Chang,  E., 1990, “Effect of Bond Coat Pre-Aluminizing Treatment on the Properties of ZrO2-8wt.%Y2O3/Co-29Cr-6Al-1Y Thermal Barriar Coatings,” Mater. Sci. Eng., A, A124, pp. 215–221.
Itoh,  Y., Saitoh,  M., and Ishiwata,  Y., 2001, “Aluminizing Behaviors of Vacuum Plasma Sprayed MCrAlY Coatings,” ASME J. Eng. Gas Turbines Power, 124, pp. 270–275.
Schnerder,  K., and Grunling,  H. W., 1983, “Mechanical Aspect of High Temperature Coatings,” Thin Solid Films, 107, pp. 395–416.
Itoh,  Y., 1999, “Reaction Diffusion Behaviors for Interface Between Ni-Based Super Alloys and Vacuum Plasma Sprayed MCrAlY Coatings,” ASME J. Eng. Gas Turbines Power, 121, pp. 476–483.
Itoh,  Y., Saitoh,  M., and Miyazaki,  M., 1994, “Influence of High-Temperature Protective Coatings on the Mechanical Properties of Nickel-Based Superalloys,” J. Mater. Sci., 34, pp. 3957–3966.

Figures

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Four-point bend test specimen for aluminized VPS MCrAlY coatings
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SEM observation and EPMA analysis of aluminized VPS MCrAlY coatings; (a) aluminized layer of heat-treated VPS CoCrAlY coating, (b) aluminized layer of heat-treated VPS CoNiCrAlY coating
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Aluminized behaviors of various VPS MCrAlY coating
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Vickers hardness of aluminized VPS MCrAlY coatings in comparison with that of VPS MCrAlY coatings
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Young’s modulus of aluminized VPS MCrAlY coatings in comparison with that of VPS MCrAlY coatings
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Poisson’s ratio of aluminized VPS MCrAlY coatings in comparison with that of VPS MCrAlY coatings
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Four-point bend strength of aluminized VPS MCrAlY coatings in comparison with that of VPS MCrAlY coatings
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Modified four-point bend strength of aluminized VPS MCrAlY coatings by taking account of three-layered effect
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Measurement results of residual stress for aluminized VPS MCrAlY coatings
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Modified four-point bend strength of aluminized VPS MCrAlY coatins by taking account of three-layered effect and residual stress

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