Abstract
The carbon migration between a ferritic steel and an austenitic steel was studied in submerged arc-welded 5Cr-0.5Mo/21Cr-12Ni dissimilar metal welds (DMWs) after aging at 500°C for various times and after long-term service in technical practice. The distribution of carbon, chromium, nickel, and iron in the areas around the weld interface was determined by electron probe microanalysis, and the microstructural aspect in the carbon-depleted/enriched zone was characterized by optical microscopy and transmission electron microscopy (TEM). Furthermore, the precipitation sequences and composition characteristics of the carbides were identified by diffraction pattern microanalysis and energy-dispersive X-ray (EDX) microanalysis. It was found (1) that there exists a coherent relationship between intracrystalline M23C6 and the austenitic matrix; (2) that the composition of M23C6 in the carbon-enriched zone is independent of the duration of aging and service; (3) that the maximum carbon concentration is determined by the carbide type, the composition characteristic of precipitated carbides, and the concentration of carbide-forming Cr adjacent to the weld interface in the carbon-enriched zone; and (4) that the carbon migration in the 5Cr-0.5Mo/21Cr-12Ni DMWs can be described by a diffusion model.
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References
C.D. Lundin: Weld. J., 1982, vol. 61, pp. 58s-63s.
R.L. Klueh and J.F. King: Weld. J., 1982, vol. 61, pp. 302s-311s.
D.I. Roberts, R.H. Ryder, and R. Viswanathan: J. Pressure Vessel Technol., 1985, vol. 107, pp. 247–54.
A.K. Bhaduri and I. Gowrisankar: Mater. Sci. Technol., 1988, vol. 4, pp. 1020–29.
R.D. Nichoson: Mater. Sci. Technol., 1985, vol. 1, pp. 227–33.
R.B. Dooley: Weld. J., 1982, vol. 61, pp. 45s-49s.
G.M. Campbell, J.W. Elmer, W.S. Gibbs, D.K. Matlock, and D.L. Olson: Trends in Welding Research in the United States, Conf. Proc., ASM, Metals Park, OH, 1982, pp. 443–69.
J. Pavlovsky, B. Million, K. Ciha, and Stranky: Mater. Sci. Eng., 1991, vol. A149, pp. 105–10.
J.M. Race and H.K.D.H. Bhadeshia: Mater. Sci. Technol., 1992, vol. 8, pp. 875–82.
N. Bailey: Welding Dissimilar Metal, Conf. Proc., The Welding Institute, Abington, Cambridge, United Kingdom, 1986, pp. 1–6.
R.D. Nicholson and A.T. Price: Welding Dissimilar Metal, Conf. Proc., The Welding Institute, Abington, Cambridge United Kingdom, 1986, pp. 53–57.
Jin Yu: Metall. Trans. A, 1989, vol. 20A, pp. 1561–64.
R.G. Baker and J. Nutting: J. Iron Steel Inst., 1959, vol. 192, pp. 257–68.
R.L. Klueh and J.M. Leitnaker: Metall. Trans. A, 1975, vol. 6A, pp. 2089–93.
P.K. Liaw, M.G. Burk, A. Saxena, and J.D. Landes: Metall. Trans. A, 1991, vol. 22A, pp. 455–68.
M.L. Huang: Master’s Thesis, Dalian University of Technology, Dalian, China, 1992.
K.S. He and X.F. Cao: Dissimilar Metal Welding, The Mechanics Press, Beijing, 1986 (in Chinese).
J. Kunze: Nitrogen and Carbon in Iron and Steel Thermodynamics, Akademie, Berlin, 1990.
J.M. Titchmarsh: Proc. 9th Int. Congr. on Electron Microscopy, The Microscopical Society of Canada, Toronto, 1978, vol. 1, pp. 618–19.
J. Pilling and N. Ridley: Metall. Trans. A, 1982, vol. 13A, pp. 557–63.
M.L. Huang and L. Wang: Dalian University of Technology, Dalian, China, unpublished research, 1997.
J. Crank: The Mathematics of Diffusion, Clarendon Press, Oxford, United Kingdom, 1975.
X.T. Wang: Metallic Materials, The Mechanics Press, Beijing, 1987.
M. Hillert: Diffusion Controlled Reactions in Alloys and Thermodynamics of Alloy, Liaoning Science and Technology Press, Shenyang, 1984 [(Chinese edition, Translation by Q.Y. Li).]
G.X. Lu and Z.S. Hou: Physical Metallurgy, Shanghai Science and Technology Press, Shanghai, 1985 (in Chinese).
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Huang, M.L., Wang, L. Carbon migration in 5Cr-0.5Mo/21Cr-12Ni dissimilar metal welds. Metall Mater Trans A 29, 3037–3046 (1998). https://doi.org/10.1007/s11661-998-0211-1
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DOI: https://doi.org/10.1007/s11661-998-0211-1