Abstract
Overtempering characteristics of Mn-Cr steel used in retaining rings have been considered. The microstructures of the steel at various tempering temperatures have been determined. Mechanical properties at room temperature along with fractographic characteristics of the tensile and impact test specimens have been evaluated. The metallographic results show that massive carbide precipitation begins at 450‡ C onwards on stress relief. The mechanical test results indicate that the determination of the percentage reduction in area in tensile test, energy absorbed in impact test, and both tensile and impact fractographs give an accurate picture of the health of a retaining ring forging.
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References
S. Stein: Manufacture of Retaining Rings. M.O. Speidel and A. Strens (eds.),Corrosion in Power Generating Equipment, Plenum Press, 1984.
N.L. Kilpatrick, J.S. Habib, L.C. Nottingham, and S.K. Hwang: Electric Power Research Institute Workshop on Retaining Rings, 1982.
V. Scalise, G. Benucci, and G. Rossi: The Manufacture of Nonmagnetic End Bells for Turbogenerators, Conference on Heavy Forging, Terni, 1961: BISI Trans 2518, 1961.
R.B. Scarlin and J. Albrecht: Environment Induced Cracking of Generator Rotor Retaining Ring. M.O. Speidel and A. Atrens (eds.),Corrosion in Power Generating Equipment, Plenum Press, 1984.
V. Chihal, F. Poboril, A.V. Rjabcenkov, and V.I. Gerasimov:Werkstoffe Korrosion, 1980, Vol. 31, p. 34.
M.O. Speidel:V.G.B. Kraffwerktechnik (English), 1982, Vol. 5, p. 362.
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Mukhopadhyay, N., Somasundaram, R. Influence of overtempering on the micromechanical aspects of a Mn-Cr steel used in turbogenerator. J. Materials Engineering 11, 177–184 (1989). https://doi.org/10.1007/BF02834466
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DOI: https://doi.org/10.1007/BF02834466