Abstract
This paper describes the results of slow strain rate (ε = 4.4 × 10-5 s-1) tensile tests performed at temperatures between 25 and 700 °C on a high purity CrMoV steel containing various dopants. The materials all had a bainitic microstructure, a hardness of RC28, and a grain size of ASTM 0. Some samples were step cooled prior to tensile testing. Four different compositions were tested: undoped (HP), Mn + P doped (MnP), P doped (P), and Sn doped (Sn) materials. All four materials failed in a low ductility cleavage mode at low temperatures and by a low ductility grain boundary cavitation mode at high temperatures. At intermediate temperatures, around 500 °C, the MnP material showed the highest ductility, the HP and Sn materials showed the lowest, and the P material was intermediate. The beneficial effects of both Mn and P on the creep ductility are rationalized in terms of their control of the sulfur concentration on prior austenite boundaries. In addition, it is suggested that P on the grain boundaries can reduce the cavitation rate by reducing the grain boundary self diffusion rate.
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A. J. Perry:J. of Mat. Sci., 1974, vol. 9, p. 1016.
L. E. Svenson and G. L. Dunlop:Canadian Met. Quarterly, 1979, vol. 18, p. 39.
L. E. Svenson and G. L. Dunlop:Int. Met. Rev., 1981, vol. 26, p. 109.
M. F. Ashby, G. Ghandhi, and D. M. R. Taplin:Acta Met., 1979, vol. 27, p. 699.
B. F. Dyson:Creep and Fracture of Engineering Materials and Structures, B. Wilshire and D. R. J. Owen, eds., Pineridge Press, Swansea, 1981, p. 235.
D. P. Pope and D. S. Wilkinson:Creep and Fracture Engineering Materials and Structures, B. Wilshire and D.R. J. Owen, eds., Pineridge Press, Swansea, 1981, p. 531.
L. M. T. Hopkin:J. Instit. Metals, 1956, vol. 85, p. 422.
D. McLean:J. Instit. Metals, 1956, vol. 85, p. 468.
M. P. Seah:Philos. Trans. R. Soc. London A, 1980, vol. 295, p. 265.
D. S. Wilkinson, K. Abiko, N. Thyagarajan, and D. P. Pope:Metall. Trans. A, 1980, vol. 11A, p. 1827.
A. S. Argon, I. W. Chen, and C. W. Lau:Creep-Fatigue-Environment-lnteractions, R. M. Pelloux and N. S. Stoloff, eds., TMS-AIME, New York, NY, 1980, p. 46.
T. Takasugi and V. Vitek:Metall. Trans. A, 1981, vol. 12A, p. 659.
J. Yu and C. J. McMahon, Jr.:Metall. Trans. A, 1980, vol. 11A, p. 277.
J. Yu and C. J. McMahon, Jr.:Metall. Trans. A, 1980, vol. 11A, p. 291.
E. D. Hondros and M. P. Seah:Scr. Met., 1972, vol. 6, p. 1007.
B. D. Powell, H. J. Westwood, D. M. R. Taplin, and H. Mykura:Metall. Trans., 1973, vol. 4, p. 2357.
T. Watanabe and K. Yamamoto:Tetsu to Hagane, 1975, vol. 61, p. S730.
T. Watanabe, K. Yamamoto, M. Nanun, and M. Ueno:Tetsu to Hagane, 1976, vol. 62, p. S373.
H. J. Grabke, W. Paulitschke, G. Tauber, and H. Viefhaus:Surface Sci., 1977, vol. 63, p. 377.
C. L. Briant and S. K. Banerji:Metall. Trans. A, 1979, vol. 10A, p. 1151.
C. L. Briant and S. K. Banerji:Metall. Trans. A, 1981, vol. 12A, p. 309.
J. C. Murza and C. J. McMahon, Jr.: University of Pennsylvania, Philadelphia, PA, unpublished research, 1979.
R. Plkington, G. Willoughby, and J. Barford:Metal Sci. J., 1971, vol. 5, p. 1.
C. D. Joy and J. Nutting:Effect of second-phase particles on the mechanical properties of steel, London, The Iron and Steel Institute, 1971, p. 95.
D. Hull and D. E. Rimmer:Phil. Mag., 1959, vol. 4, p. 673.
T. J. Chuang and J. R. Rice:Acta Met., 1973, vol. 21, p. 1625.
G. M. Pharr and W. D. Nix:Acta Met., 1979, vol. 27, p. 1615.
D. Gupta:Metall. Trans. A, 1977, vol. 8A, p. 1431.
E. T. Turkdogan, S. Ignatowicz, and J. Pearson:JISI, 1955, vol. 180, p. 349.
C. J. Middleton:Metal Sci., 1981, vol. 15, p. 154.
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Takasugi, T., Pope, D.P. Compositional effects on the high temperature ductility of 1 Cr-1.25 Mo-0.25 V Steel. Metall Trans A 13, 1471–1481 (1982). https://doi.org/10.1007/BF02642886
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DOI: https://doi.org/10.1007/BF02642886