Abstract
The effects of sulfur content (0.004 or 0.013 pct) and sulfide morphology (stringered or globular) on anisotropy of tensile ductility and Charpy shelf energy were investigated in a series of 0.1 and 0.2 pct carbon, 1.0 pct manganese steels. The effect of sulfide inclusions on fracture strain or Charpy shelf energy correlated with the projected area of inclusions per unit volume,A v , on a plane perpendicular to the tensile direction and the mean free distance between inclusions, λ, in a direction parallel to the tensile direction regardless of the amount or the shape of the inclusions or the test direction: longitudinal, transverse, or through-thickness. The magnitude ofA v is directly proportional to the volume fraction of inclusions and inversely proportional to the inclusion dimension parallel to the tensile direction. The mean free distance, λ, is inversely proportional toA v . Approximate relations were obtained for the nearest-neighbor distances between inclusions on the longitudinal, transverse, and through-thickness planes. These distances were incorporated into a model for ductile fracture based on an adaptation of a previously proposed criterion for the linkage of voids nucleated at second-phase particles. The agreement between the observed and predicted fracture strains for longitudinal, transverse, and through-thickness specimens of the steels studied is encouraging.
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W.A. Spitzig and R.J. Sober:Metall. Trans. A, 1981, vol. 12A, pp. 281–91.
W.A. Spitzig:Metall. Trans. A, 1983, vol. 14A, pp. 471–84.
W. A. Spitzig, R. J. Sober, N. J. Panseri, and R. J. Lee:Metallography, 1983, vol. 16, pp. 171–98.
J. Gurland:Quantitative Microscopy, R. T. DeHoff and F. N. Rhines, eds., McGraw-Hill Book Co., New York, NY, 1968, pp. 278–90.
E. E. Underwood:Quantitative Stereology, Addison-Wesley Publishing Co., Reading, MA, 1970, chap. 4.
C.W. Corti, P. Cotterill, and G. A. Fitzpatrick:Int. Metall. Revs., 1974, vol. 19, pp. 77–88.
R. T. DeHoff: University of Florida, Gainesville, FL, private communication, 1979.
E. E. Underwood:Quantitative Microscopy, R. T. DeHoff and F.N. Rhines, eds., McGraw-Hill Book Co., New York, NY, 1968, pp. 77–127.
R.T. DeHoff:Quantitative Microscopy, R. T. DeHoff and F.N. Rhines, eds., McGraw-Hill Book Co., New York, NY, 1968, pp. 128–48.
F. B. Pickering:Toward Improved Ductility and Toughness, Climax Molybdenum Co., Ann Arbor, MI, 1971, pp. 9–31.
L. M. Brown and J. D. Embury:The Microstructure and Design of Alloys, The Institute of Metals, Cambridge, England, 1973, vol. 1, pp. 164–69.
D. LeRoy, J. D. Embury, G. Edward, and M. F. Ashby:Acta Metall., 1981, vol. 29, pp. 1509–22.
R. Becker: M.S. Thesis, University of Pittsburgh, Pittsburgh, PA, 1983.
P. J. Wray, O. Richmond, and H. L. Morrison:Metallography, 1983, vol. 16, pp. 39–58.
D. J. Widgery and J. F. Knott:Metal Science, 1978, vol. 12, pp. 8–11.
A. W. Thompson:Metall. Trans. A, 1978, vol. 10A, pp. 727–31.
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Formerly with United States Steel Corporation, Research Laboratory, Monroeville, PA 15146
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Spitzig, W.A. Effect of shape of sulfide inclusions on anisotropy of inclusion spacings and on directionality of ductility in hot-rolled C-Mn steels. Metall Trans A 15, 1259–1264 (1984). https://doi.org/10.1007/BF02644720
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DOI: https://doi.org/10.1007/BF02644720