Comparison of theoretically predicted and experimentally determined submerged arc weld deposit compositions
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For comparison, data are also provided in Figure 3 from internal precipitation studies for fluorine 6 in nickel. These simple experiments show that chlorine atoms are clearly reasonably soluble and mobile in solid Ni at high temperatures. Indeed, the species chlorine and fluorine may be important in grain boundary embrittlement phenomena.
Fig. l - - l n t e r n a l CrCI: precipitation zone in Ni-0.56 at. pet Cr alloy reacted at 1173 K for 96 h. Magnification 370 times.
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The authors are grateful to G.C. Wood and E H. Stott for supplying the alloys, and to L. E. Overley for the Auger analyses. This note will also be published in the Proceedings of the Japanese Institute of Metals Third International Symposium on High Temperature Corrosion of Metals and Alloys.
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Fig. 2 - - K i n e t i c s of internal chloridalion of Ni-0.56 Cr and Ni-2.0 Cr alloys. Square of precipitation zone thickness vs time.
1. R. A Rapp: Corr., 1965, vol. 21, pp. 382-40. 2. J.H. Swisher: Oxidation of Metals and Alloys, D.L. Douglass, ed., Amer. Soc. Metals, Metals Park, OH, 1971, pp. 235-67. 3. J.L. Meijering: Adv. Mater. Res., H. Herman, ed., Wiley Publ., New York, NY, 1971, vol. 5, pp. 1-81. 4. S . N . S . Reddy and R . A . Rapp: Metall. Trans. B, 1978, vol. 9B, pp. 559-65. 5. S . N . S . Reddy and R.A. Rapp: Metall. Trans. B, 1980. vol. liB, pp. 99-106. 6. S . N . S . Reddy and R.A. Rapp: Metall. Trans. B, 1980, vol. liB, pp. 533-34.
Comparison of Theoretically Predicted and Experimentally Determined Submerged Arc Weld Deposit Compositions U. MITRA, R.D. SUTTON, and T. W. EAGAR
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A thermodynamic model for treating the equilibria between slag and metal during submerged arc welding was presented recently by Chat and Eagar. ~ They have successfully shown a model capable of determining whether the weld metal gains or loses silicon and manganese, while placing a limit on the amount of gain or loss of these alloying elements. In the present work the validity of this model is tested with three commercial fluxes. In addition, the accuracy and consistency of the model is compared with the various empirical approaches which are often used. Six layer weld deposits were made on A-36 plates using a single electrode composition and three different flux systems. For each weld small variations were made in flux
U. MITRA. Graduate Student, and T. W. EAGAR, Associate Professor, are with the Department of Materials Science and Engineering. Massachuselts Institute of Technology, Cambridge, MA 02139. R.D. SUTTON is Manager, Mate
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