Abstract
The microstructural evolution during hot-strip rolling has been investigated in four commercial high-strength low-alloy (HSLA) steels and compared to that of a plain, low-carbon steel. The recrystallization rates decrease as the Nb microalloying content increases, leading to an increased potential to accumulate retained strain during the final rolling passes. The final microstructure and properties of the hot band primarily depend on the austenite decomposition and precipitation during run-out table cooling and coiling. A combined transformation-ferrite-grain-size model, which was developed for plain, low-carbon steels, can be applied to HSLA steels with some minor modifications. The effect of rolling under no-recrystallization conditions (controlled rolling) on the transformation kinetics and ferrite grain refinement has been evaluated for the Nb-containing steels. Precipitation of carbides, nitrides, and/or carbonitrides takes place primarily during coiling, and particle coarsening controls the associated strengthening effect. The microstructural model has been verified by comparison to structures produced in industrial coil samples.
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R.A. Heimbuch: 40th Mechanical Working and Steel Processing Conf. Proc., ISS, Warrendale, PA, 1998, vol. XXXVI, pp. 3–10.
P. Choquet, P. Fabregue, J. Giusti, B. Chamont, J.N. Pezant, and F. Blanchet: in Mathematical Modelling of Hot Rolling of Steels, S. Yue, ed., The Metallurgical Society of CIM, Montreal, pp. 34–43.
J.J. Jonas and C.M. Sellars: Iron Steelmaker, 1992, vol. 19(10), pp. 67–71.
P.D. Hodgson and R.K. Gibbs: Iron Steel Inst. Jpn. Int., 1992, vol. 32, pp. 1329–38.
T. Senuma, M. Suehiro, and H. Yada: Iron Steel Inst. Jpn. Int., 1992, vol. 32, pp. 423–32.
O. Kwon, K.J. Lee, J.K. Lee, K.B. Kang, J.K. Kim, J.D. Lee, and J. Kim: HSLA Steels ’95, G. Liu, H. Stuart, H. Zhang, and C. Li, eds., China Science and Technology Press, Beijing, 1995, pp. 82–89.
D.Q. Jin, V.H. Hernandez-Avila, I.V. Samarasekera, and J.K. Brimacombe: Modelling of Metal Rolling Processes, The Institute of Materials, London, 1996, pp. 36–58.
J. Andorfer, D. Auzinger, B. Buchmayr, W. Giselbrecht, G. Hribernig, G. Hubmer, A. Luger, and A. Samoilov: Thermec ’97, T. Chandra and T. Sakai, eds., TMS, Warrendale, PA, 1997, pp. 2069–75.
D.Q. Bai, S. Yue, W.P. Sun, and J.J. Jonas: Metall. Trans. A, 1993, vol. 24A, pp. 2151–59.
R.L. Bodnar, R.O. Adebanjo, and S.S. Hansen: 37th Mechanical Working and Steel Processing Conf. Proc., ISS, Warrendale, PA, 1995, vol. XXXIII, pp. 743–57.
T. Siwecki, B. Hutchinson, and S. Zajac: Microalloying ’95, ISS, Warrendale, PA, 1995, pp. 197–211.
S.F. Medina: Mater. Sci. Technol., 1998, vol. 14, pp. 217–21.
B. Dutta and C.M. Sellars: Mater. Sci. Technol., 1987, vol. 3, pp. 197–206.
W.P. Sun, M. Militzer, and J.J. Jonas: Can. Metall. Q., 1993, vol. 32, pp. 155–63.
H. Zou and J.S. Kirkaldy: Metall. Trans. A, 1991, vol. 22A, pp. 1511–24.
W.J. Liu and J.J. Jonas: Metall. Trans. A, 1988, vol. 19A, pp. 1403–13.
W.J. Liu: Metall. Mater. Trans. A, 1995, vol. 26A, pp. 1641–57.
S.P. Gupta: Steel Res., 1993, vol. 64, pp. 623–29.
F. Ishikawa, T. Takahashi, and T. Ochi: Metall. Mater. Trans. A, 1994, vol. 25A, pp. 929–36.
W.P. Sun, M. Militzer, D.Q. Bai, and J.J. Jonas: Acta Metall. Mater., 1993, vol. 41, pp. 3595–3604.
M. Djahazi, X.L. He, J.J. Jonas, and W.P. Sun: Mater. Sci. Technol., 1992, vol. 8, pp. 628–35.
R.C. Peterson, B.A. Parker, and R.K. Gibbs: in Low Carbon Steels for the 90’s, R. Asfahani and G. Tither, eds., TMS, Warrendale, PA, 1993, pp. 131–37.
Z. Yao: High Strength Sheet Steels for the Automotive Industry, ISS, Warrendale, PA, 1994, pp. 37–44.
J.J. Jonas and I. Weiss: Met. Sci., 1979, vol. 13, pp. 238–45.
S. Yamamoto, C. Ouchi, and T. Osuka: in Thermomechanical Processing of Microalloyed Austenite, A.J. DeArdo, G.A. Ratz, and P.J. Wray, eds., AIME, Warrendale, PA, 1982, pp. 613–39.
X.L. He, M. Djahazi, J.J. Jonas, and J. Jackman: Acta Metall. Mater., 1991, vol. 39, pp. 2295–2308.
N. Maruyama, R. Uemori, and M. Sugiyama: Mater. Sci. Eng. A, 1998, vol. A250, pp. 2–7.
W.P. Sun and E.B. Hawbolt: Iron Steel Inst. Jpn. Int., 1997, vol. 37, pp. 1000–09.
M. Militzer, A. Giumelli, E.B. Hawbolt, and T.R. Meadowcroft: Metall. Mater. Trans. A, 1996, vol. 27A, pp. 3399–3409.
M. Militzer, R. Pandi, and E.B. Hawbolt: Metall. Mater. Trans. A, 1996, vol 27A, pp. 1547–56.
M. Militzer, R. Pandi, E.B. Hawbolt, and T.R. Meadowcroft: in Hot Workability of Steels and Light Alloys-Composites, H.J. McQueen, E.V. Konopleva, and N.D. Ryan, eds., The Metallurgical Society of CIM, Montreal, 1996, pp. 373–80.
J.S. Kirkaldy and E.A. Baganis: Metall. Trans. A, 1978, vol. 9A, pp. 459–501.
D. Hall and J. Worobec: in Phase Transformations during the Thermal/Mechanical Processing of Steel, E.B. Hawbolt and S. Yue, eds., The Metallurgical Society of CIM, Montreal, pp. 305–16.
W.P. Sun, E.B. Hawbolt, T.R. Meadowcroft, and J.J. Jonas: HSLA Steels ’95, G. Liu, H. Stuart, H. Zhang, and C. Li, eds., China Science and Technology Press, Beijing, 1995, pp. 169–74.
R. Pandi, M. Militzer, E.B. Hawbolt, and T.R. Meadowcroft: in Phase Transformations during the Thermal/Mechanical Processing of Steel, E.B. Hawbolt and S. Yue, eds., The Metallurgical Society of CIM, Montreal, 1995, pp. 459–71.
A. Giumelli, M. Militzer, and E.B. Hawbolt: Iron Steel Inst. Jpn. Int., 1999, vol. 39, pp. 271–80.
M. Militzer and E.B. Hawbolt: Grain Growth in Polycrystalline Materials III, H. Weiland, B.L. Adams, and A.D. Rollett, eds., TMS, Warrendale, PA, 1998, pp. 639–44.
M. Militzer, D.Q. Jin, and I.V. Samarasekera: in Advances in Industrial Materials, D.S. Wilkinson, W.J. Poole, and A. Alpas, eds., The Metallurgical Society of CIM, Montreal, pp. 63–77.
W.P. Sun, M. Militzer, R. Pandi, and E.B. Hawbolt: in Accelerated Cooling/Direct Quenching of Steels, R. Asfahani, ed., ASM, Materials Park, OH, 1997, pp. 109–16.
W.P. Sun, M. Militzer, E.B. Hawbolt, and T.R. Meadowcroft: Thermec ’97, T. Chandra and T. Sakai, eds., TMS, Warrendale, PA, 1997, pp. 685–91.
W.P. Sun, M. Militzer, E.B. Hawbolt, and T.R. Meadowcroft: Trans. Iron Steel Soc., 1998, vol. 25 (5), pp. 85–94.
R. Gjengedal, J.K. Solberg, and X.D. Liu: HSLA Steels ’95, G. Liu, H. Stuart, H. Zhang, and C. Li, eds., China Science and Technology Press, Beijing, 1995, pp. 357–62.
M. Militzer, R. Pandi, E.B. Hawbolt, and T.R. Meadowcroft: in Accelerated Cooling/Direct Quenching of Steels, R. Asfahani, ed., ASM, Materials Park, OH, 1997, pp. 151–57.
J. Agren: Scripta Metall., 1986, vol. 20, pp. 1507–10.
S.V. Subramanian, X. Zheng, L.E. Collins, M. Bucholtz, and M. Kostic: in Low Carbon Steels for the 90’s, R. Asfahani and G. Tither, eds., TMS, Warrendale, PA, 1993, pp. 313–22.
I. Tamura, H. Sekine, T. Tanaka, and C. Ouchi: Thermomechanical Processing of High Strength Low Alloy Steels, Butterworth and Co., London, 1988, p. 21.
P.C. Campbell, E.B. Hawbolt, and J.K. Bimacombe: Metall. Trans. A, 1991, vol. 22A, pp. 2779–90.
M. Umemoto, A. Hiramatsu, A. Moriya, T. Watanabe, S. Nanba, N. Nakajima, G. Anan, and Y. Higo: Iron Steel Inst. Jpn. Int., 1992, vol. 32, pp. 306–15.
M. Suehiro, K. Sato, Y. Tsukano, H. Yada, T. Senuma, and Y. Matsumura: Trans. Iron Steel Inst. Jpn., 1987, vol. 27, pp. 439–45.
R. Priestner and P.D. Hodgson: Mater. Sci. Technol., 1992, vol. 8, pp. 849–54.
E.V. Pereloma and J.D. Boyd: Mater. Sci. Technol., 1996, vol. 12, pp. 808–17.
M. Militzer, W.P. Sun, W.J. Poole, and P. Purtscher: Thermec ’97, T. Chandra and T. Sakai, eds., TMS, Warrendale, PA, 1997, pp. 2093–99.
L.E. Collins, D.L. Baragar, J.T. Bowker, M.M. Kostic, and S.V. Subramanian: Microalloying ’95, ISS, Warrendale, PA, 1995, pp. 141–47.
G.A. Duit, A. Hurkmans, J.J.F. Scheffer, and T.M. Hoogendoorn: Thermec ’88, I. Tamura, ed., ISIJ, Tokyo, 1988, pp. 114–21.
M. Militzer, W.J. Poole, and W.P. Sun: Steel Res., 1998, vol. 69, pp. 279–85.
I.M. Lifshitz and V.V. Slyozov: J. Phys. Chem. Solids, 1961, vol. 19, pp. 35–50.
C. Wagner: Z. Electrochem., 1961, vol. 65, pp. 581–91.
H.R. Shercliff and M.F. Ashby: Acta Metall. Mater., 1990, vol. 38, pp. 1789–1802.
L.G.E. Vollrath, R. Hackl, K.G. Schmitt-Thomas, and D. Daub: Microalloying ’88, ASM, Metals Park, OH, 1988, pp. 353–58.
P. Repas: HSLA Steels: Technology and Applications, ASM, Metals Park, OH, 1984, pp. 203–08.
I.V. Samarasekera, D.Q. Jin, and J.K. Brimacombe: 38th Mechanical Working and Steel Processing Conf. Proc., ISS, Warrendale, PA, 1996, vol. XXXIV, pp. 313–27.
I.V. Samarasekera, D.Q. Jin, and J.K. Brimacombe: Thermec ’97, T. Chandra and T. Sakai, eds., TMS, Warrendale, PA, 1997, pp. 57–66.
L.E. Collins: in Materials for Resource Recovery and Transport, L.E. Collins, ed., The Metallurgical Society of CIM, Montreal, 1998, pp. 251–65.
I.V. Samarasekera, C.A. Muojekwu, D.Q. Jin, and J.K. Brimacombe: 39th Mechanical Working and Steel Processing Conf. Proc., ISS, Warrendale, PA, 1998, vol. XXXV, pp. 861–73.
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Militzer, M., Hawbolt, E.B. & Meadowcroft, T.R. Microstructural model for hot strip rolling of high-strength low-alloy steels. Metall Mater Trans A 31, 1247–1259 (2000). https://doi.org/10.1007/s11661-000-0120-4
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DOI: https://doi.org/10.1007/s11661-000-0120-4