Measurement of the activity of boron in liquid copper using a four-phase equilibrium technique
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is work has been supported by 1997 Pohang Iron and Steel Co. (POSCO) under Contract No. 1PD9704001. The authors thank Professor Nack J. Kim, POSTECH; Dr. Ki Jong Park, Dr. Kwang Sup Noh, and Mr. Jung Min Choi, POSCO; and Mr. Jae Eul Kim, Mijoo Steel Co., for their helpful discussion on spiral piping and macrostructural analysis. REFERENCES 1. R.W.K. Honeycombe: Scand. J. Metall., 1956, vol. 8, pp. 21-26. 2. H. Watanabe, Y.E. Smith, and R.D. Pejlke: The Hot Deformation of Austenite, AIME, New York, NY, 1997, pp. 140-68. 3. Specification for High-Test Linepipe, 18th ed., American Petroleum Institute, Standard 5XL, New York, 1971. 4. Material Specification, Canadian Arctic Gas Pipeline Limited, Specification No. 2950-6-6, 1973. 5. G.E. Dieter: Mechanical Metallurgy, 3rd ed., McGraw-Hill, New York, NY, 1986, pp. 236-37. 6. R. Sowerby, Y. Tomita, and D.K. Uko: Mater. Sci. Eng., 1979, vol. 41, pp. 43-58. 7. T. Taira, T. Osuka, and Y. Ishida: Proc. 15th Mechanical Working and Steel Processing Conf., Pittsburgh, PA, 1977, p. 33. 8. G. Tither and M. Lavite: J. Met., 1975, vol. 27, pp. 15-23. 9. K.J. Pascoe: J. Strain Analysis, 1971, vol. 6, pp. 167-80. 10. C.D. Singh and V. Ramaswamy: Steel India, 1983, vol. 6, pp. 89-98. 11. A. Seeger, S. Mader, and H. Kranmuller: Interscience, 1963, p. 665. 12. A.P. Coldren, Y.E. Smith, and R.L. Cryderman: Processing and Properties of Low-Carbon Steel, AIME, New York, NY, 1973, pp. 163-89. 13. A.P. Coldren and J.L. Mehelich: Molybdenum Containing Steels for Gas and Oil Industry Application, Climax Molybdenum Co., Greenwich, CN, 1977, pp. 14-28. 14. J.J. Irani and G. Tither: ISI Publication, 1967, vol. 104, p. 135.
Measurement of the Activity of Boron in Liquid Copper using a FourPhase Equilibrium Technique K.T. JACOB, SHASHANK PRIYA, and YOSHIO WASEDA Boron can be used to deoxidize liquid copper. It can be added as a Cu-B master alloy or as tetraboron carbide (B41xC). Presence of boron as a minor element is known to increase the resistance of copper alloys to corrosive wear. Despite potential application in the metallurgy of copper, there is no reliable experimental information on either the activity of boron in liquid copper or of its effect on the behavior of dissolved oxygen. The phase diagram of Cu-B system is of simple eutectic type characterized by eutectic temperature of 1286 K and eutectic composition XB 5 0.133.[1] Phase diagram literature has been reviewed by Chakrabarti and Laughlin.[1] There is some uncertainty in the reported values for the eutectic temperature and composition.
K.T. JACOB, Professor, Department of Metallurgy and Materials Research Center, and SHASHANK PRIYA, Graduate Student, Department of Metallurgy, are with the Indian Institute of Science, Bangalore 560 012, India. YOSHIO WASEDA, Professor and Director, is with the Institute for Advanced Materials Processing, Tohoku University, Sendai 980-8577, Japan. Manuscript submitted October 29, 1999. METALLURGICAL AND MATERIALS TRANSACTIONS A
Yukinobu et al.[2] have determined the activity of boron in liquid Cu-B a
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