Recovery and recrystallization phenomena and effects of microalloying elements on these phenomena are of great importance in designing thermomechanical processes of microalloyed steels. Control of these phenomena can lead to manufacturing of products with suitable structures and desirable properties. The aim of this study was to investigate the microstructural evolution occurring during thermomechanical processing through hot compression testing. The niobium carbonitride approximate solution temperature was initially determined to guess the optimum reheating temperature. Then continuous and interrupted compression tests were utilized to physically model the dynamic and static recrystallization (SRX) behavior of the steel during thermomechanical processing. The parameters of the flow stress model and the activation energy of dynamic recrystallization (DRX) were calculated and the effects of deformation conditions on peak strain of DRX were evaluated. In addition, a kinetic study of the static softening of austenite indicated that the plateau occurred in recrystallization fraction-time curves below 1025 °C. This was considered in determining the Static Recrystallization Critical Temperature (SRCT) and construction of the Recrystallization Retardation-Temperature Time (RRTT) diagram for this steel.
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References
P.D. Hodgson and M.R. Barnett, The Thermomechanical Processing of Steels Current and Future Trends, Metal Forming 2000, Proceedings of the 8th International Conference on Metal Forming, M. Pietrzyk et al., Eds., (Rotterdam), Balkema, 2000, p 21–28
Ch. Ouchi, Development of Steel Plates by Intensive Use of TMCP and Direct Quenching Processes, ISIJ Int., 41(6), 2001, p 542- 553, in English.
F.J. Humphreys and M. Hatherly, Recrystallization and Related Annealing Phenomena, 2nd edn., Oxford, Pergamon, 2004, in English.
O. Kwon and A.J. DeArdo, Interactions Between Recrystallization and Precipitation in Hot-Deformed Microalloyed Steels Acta Metall Mater, 39(4), 529–538 (1991), in English.
H.L. Andrade, M.G. Akben and J.J. Jonas, Effect of Molybdenum, Niobium, and Vanadium on Static Recovery and Recrystallization and Solute Strengthening in Microalloyed Steels, Metall. Trans., 14A, 1983, p 1967–1977, in English.
S·F. Medina and J.E. Mancilla, Static Steels Recrystallization at Temperatures Modeling Below of the Hot Deformed Microalloyed Critical Temperature, ISIJ Int., 36(8), 1996, p 1070–1083, in English.
S·F. Medina and J.E. Mancilla, Determination of Static Recrystallization Critical Temperature of Austenite in Microalloyed Steels, ISIJ Int., 33(12), 1993, p 1257–1264, in English.
S·F. Medina and A. Quispe, Improved Model for Static Recrystallization Kinetics of Hot Deformed Austenite in Low Alloy and Nb/V Microalloyed Steels, ISIJ Int., 41(7), 2001, p 774–781, in English.
R. Abad, A.I. Fernandez, B. Lopez and J.M. Rodriguez, Interaction Between Recrystallization and Precipitation During Multipass Rolling in a Low Carbon Niobium Microalloyed Steel”, ISIJ Int., 41(7), 2001, p 1373–1382, in English.
K.J. Lee, Recrystallization and Precipitation Interaction in Nb Containing Steels, Scr. Mater., 40(7), 1999, p 837–843, in English.
J. Perttula, P. Kantanen and P. Karjalainen, Effect of Precipitation on Flow Stress and Recrystallization in Nb- and Ti-Bearing Austenite, Scandinavian J. of metallurgy, 27, 1998, p 128–132, in English.
S·H. Cho, K·B. Kang and J. Jonas, The Dynamic, Static and Metadynamic Recrystallization of a Nb- Microalloyed Steel, ISIJ Int., 41(1), 2001, p 63–69, in English.
M. Carsi, V. Lopez, F.Penalba and O.A. Ruano, The Strain Rate as a Factor Influencing the Hot Forming Simulation of Medium Carbon Microalloyed Steels, Mater. Sci. Eng., 216A, 1996, p 155–160, in English.
A.I. Fernandez, B.Lopez, and J.M. Rodriguez, Relationship between the Austenite Recrystallized Fraction and the softening Measured from the Interrupted Torsion Test Technique, Scr. Mater., 40(5), 1999, p 543–549, in English.
Ch. Ouchi and T. Okita, Dynamic Recrystallization Behavior of Austenite in Nb-Bearing High Strength Low Alloy Steels and Stainless Steel, Transactions ISIJ, 22, 1982, p 543–551, in English.
“Metallography; Nondestructive Testing”, ASTM Designation E112 in Annual Book of ASTM Standard, Part 3, V. 03.03, Philadelphia, PA, 1984, p 120
D.A. Porter and K.E. Easterling, Phase Transformations in Metals and Alloys, 2nd ed., Chapman & Hall, London, 1992 (in English)
K.J. Irvine, F·B. Pickering and T. Gladman, Grain Refined C–Mn Steels, J. Iron Steel Inst., 205, 1967, p 161–182, in English.
I. Weiss and J. Jonas, Interaction Between Recrystallization and Precipitation During the High Temperature Deformation of HSLA Steels, Metall. Trans., A10 (7), 1979, p 831–840, in English.
S·F. Medina, Determination of Precipitation-Time-Temperature (PTT) Diagrams for Nb, Ti, or V Microalloyed Steels, J. of Mater. Sci., 32, 1997, p 1487–1492, in English.
S·F. Medina, The influence of niobium on the static recrystallization of hot deformed austenite and on strain induced precipitation kinetics, Scr. Met. et Mat., 32(1), 1995, p 43–48, in English.
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The authors are grateful to the Arak University, which provided scholarship to Mr. B. Mirzakhani.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s11665-009-9387-9
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Mirzakhani, B., Salehi, M.T., Khoddam, S. et al. Investigation of Dynamic and Static Recrystallization Behavior During Thermomechanical Processing in a API-X70 Microalloyed Steel. J. of Materi Eng and Perform 18, 1029–1034 (2009). https://doi.org/10.1007/s11665-008-9338-x
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DOI: https://doi.org/10.1007/s11665-008-9338-x