Thermal conductivity of cobalt-base alloys
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Table I. Chemical Compositions of a Steel (Weight Percent) C 0.0026
Si
Mn
P
S
Sol. Al
N
Nb
Mo
0.26
1.50
0.040
0.011
0.041
0.0077
0.010
0.30
Fig. 2—(a) SEM micrograph, (b) EBSD result showing grain orientation in normal direction (ND), (c) color key in ND, and (d) grain boundary misorientation.
4. K. Sakata, K. Okuda, K. Seto, and T. Obara: Tetsu-To-Hagané, 1997, vol. 83, pp. 593-600. 5. W.C. Jeong and K. Cho: J. Kor. Inst. Met. Mater., 1999, vol. 37, pp. 672-79. 6. N. Yoshinaga, K. Ushioda, and O. Akisue: Proc. Symp. on High Strength Sheet Steels for Automotive Industry, R. Pradhan, ed., ISS, Warrendale, PA, 1994, pp. 149-58. 7. T. Matsumoto, S. Hamanaka, T. Yamada, and T. Tanaka: Int. Forum for Physical Metallurgy of IF Steels, ISIJ, Tokyo, 1994, pp. 269-73. 8. Bainite Committee of Iron and Steel Institute of Japan, Atlas for Bainitic Microstructures, T. Araki et al., eds., ISIJ, Tokyo, 1992. 9. G. Krauss and S.W. Thompson: Iron Steel Inst. Jpn. Int., 1995, vol. 35, pp. 937-45.
Thermal Conductivity of Cobalt-Base Alloys YOSHIHIRO TERADA, KENJI OHKUBO, TETSUO MOHRI, and TOMOO SUZUKI
Fig. 1—Microstructures of the annealed sheet. (a) optical microstructure, (b) SEM microstructure, and (c) magnified image of (b).
REFERENCES 1. N. Yoshinaga: Ph.D. Thesis, Ghent Univ., Ghent, Belgium, 1999. 2. S. Okada, S. Satoh, T. Kato, and T. Takasaki: Proc. Symp. on High Strength Sheet Steels for Automotive Industry, R. Pradhan, ed., ISS, Warrendale, PA, 1994, pp. 33-38. 3. K. Seto, K. Okua, and K. Sakata: Proc. Symp. on High Strength Sheet Steels for Automotive Industry, R. Pradhan, ed., ISS, Warrendale, PA, 1994, pp. 201-08. 2026—VOLUME 34A, SEPTEMBER 2003
Thermal conductivity is one of the important physical properties for high-performance materials at elevated temperatures.[1,2,3] High thermal conductivity is desirable for the materials to avoid degradation by local heating. A material with a low thermal conductivity is incapable of averaging
YOSHIHIRO TERADA, Associate Professor, is with the Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Tokyo 152-8552, Japan. Contact e-mail: [email protected] KENJI OHKUBO, Technician, and TETSUO MOHRI, Professor, are with the Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan. TOMOO SUZUKI, Professor, is with the Department of Environmental Systems Engineering, Kochi University of Technology, Kochi 782-0003, Japan. Manuscript submitted December 10, 2002. METALLURGICAL AND MATERIALS TRANSACTIONS A
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out the heterogeneous temperature distribution often encountered in operation, which causes degradation by oxidation, local melting, etc. Cobalt-base superalloys are currently used for gas-turbine vanes because of a combination of higher melting temperatures, good weldability, excellent hot-corrosion resistance to contaminated turbine atmospheres, and superior thermalfatigue resistance compared w
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