Abstract
The mechanical properties and microstructure of two heats of AF1410 steel were compared. The first heat, heat 811, contained a titanium addition of 0.02 wt pct, while the second heat, heat 91, contained no titanium, manganese, or other strong sulfide formers. The sulfur in heat 811 was gettered as titanium carbosulfide, while in heat 91 the sulfides were chromium sulfide. The toughness of heat 811 was found to be much enhanced compared to heat 91, with Charpy impact energies of 176 J and 79 J and KIC fracture toughness values of 235 MPa.m1/2 and 170 MPa.m1/2, respectively. This significant difference in fracture toughness is attributed to the fact that titanium carbosulfide particles are more resistant to void nucleation than the chromium sulfide particles, which appear to nucleate voids at the onset of plastic strain. In addition to altering the sulfide particle type, the titanium addition also results in the presence of undissolved MC carbides in the titanium-modified steel in addition to the M2C carbides found in heat 91. These carbides act as grain growth inhibitors, resulting in a finer prior austenite grain size and martensite packet size in heat 811.
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J.L. Maloney and W.M. Garrison, Jr.: Scripta Met., 1990, vol. 23, pp. 2097–100.
J.W. Bray, J.L. Maloney, K.S. Raghavan, and W.M. Garrison, Jr.: Metall. Trans. A, 1991, vol. 22A, pp. 2277–85.
ASTM E8-98, 1998 Annual Book of ASTM Standards, 1998, pp. 57–77.
ASTM E23-96, 1998 Annual Book of ASTM Standards, 1998, pp. 138–57.
ASTM E1737-96, 1998 Annual Book of ASTM Standards, 1998, pp. 957-80.
G.E. Dieter: Mechanical Metallurgy, McGraw-Hill Book Co., New York, NY, 1986.
E.E. Underwood: Quantitative Stereology, Addison-Wesley, MA, 1970.
L.E. Iorio and W.M. Garrison, Jr.: “The Influence of carbon content on titanium carbosulfide formation in AF1410-type steels” in 41st Mechanical Working and Steel Processing Conference Proceedings, Baltimore, MD, Iron & Steel Society, 1999.
R.L. Miller: Trans. ASM, 1964, vol. 57, pp. 892–99.
P. Villars and L.D. Calvert: Pearson’s Handbook of Crystallographic Data for Intermetallic Phases, vol. 2, American Society for Metals, 1985, p. 1575.
L.E. Iorio: Ph.D. Thesis, Carnegie Mellon University, 2000.
J.L. Maloney: Ph.D. Thesis, Carnegie Mellon University, 1992.
L.E. Iorio and W.M. Garrison, Jr.: Scripta Mater., 2002, vol. 46, pp. 863–68.
J.P. Naylor and R. Blondeau: Metall. Trans. A, 1976, vol. 7A, pp. 891–94.
A.L. Wojcieszynski: Ph.D. Thesis, Carnegie Mellon University, 1993.
G.R. Speich and W.A. Spitzig: Metall. Trans. A, 1982, vol. 13A, pp. 2239–57.
A.J. Birkle, R.P. Wei, and G.E. Pellissier: Trans. ASM, 1966, vol. 59, pp. 981–90.
M. Fujita, Y. Kawabe, and N. Nishimoto: Transactions of National Research Institute for Metals, 1981, vol. 23, pp. 149–58.
G.T. Hahn, M.F. Kanninen, and A.R. Rosenfield: in Annual Review of Materials Science (R.A. Huggins, R.H. Bube, R.W. Roberts, eds.), Annual Review Inc., Palo Alto, CA, 1972, pp. 381–404.
J.W. Bray, K.J. Handerhan, W.M. Garrison, Jr., and A.W. Thompson: Metall. Trans. A, 1992, vol. 23A, pp. 485–96.
D. Brooksbank and K.W. Andrews: JISI, 1972, vol. 210, pp. 246–55.
B. Ramalingam, J.V. Ek, J.M. MacLaren, M.E. McHenry, and W.M. Garrison, Jr.: Philos. Mag. B, 2000, vol. 80, pp. 379–94.
B. Ramalingam: Ph.D. Thesis, Carnegie Mellon University, 1998.
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Iorio, L.E., Garrison, W.M. The effects of titanium additions on AF1410 ultra-high-strength steel. Metall Mater Trans A 37, 1165–1173 (2006). https://doi.org/10.1007/s11661-006-1094-7
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DOI: https://doi.org/10.1007/s11661-006-1094-7