Abstract
Metallographic structures of carbide-free bainite steel wheel rim are mainly composed of supersaturated lath ferrite and retained austenite film among bainitic ferrite laths. It is suspected that supersaturated ferrite and retained austenite are likely to decompose under the influence of temperature change and mechanical stress. Stability of wheel rim structure is studied by means of x-ray diffraction, dye microscopy, and micro-hardness test. When the samples are tempered in the range of 150-350 °C, the retained austenite films are at the state of relative stability. Fifty percent of retained austenite is decomposed when the sample is tempered at 400 °C. Microhardness increases when the sample is tempered at 150 °C. The decrease in hardness is mild when the samples are tempered from 200 to 500 °C. The mechanical stability of retained austenite film is studied with tensile sample under the effect of tensile stress. The retained austenite appears to be stable in low and middle degree of deformation, and decomposition occurs at great amount of deformation. Diffraction peak of carbide is not found in all above experiments. The steel enriched silicon prevents the carbide precipitation during the transformation. It indicates the carbide-free bainite wheel steels have an excellent thermal and mechanical stability.
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References
J. Sun, K.J. Sawley, and D.H. Stone, Progress in the Reduction of Wheel Spalling, 12th International Wheelset Congress (China), 1998, p 18–29
Z. Yimin, Wheels an Axles of Chinese Railway Locomotive and Car Meeting Challenges of 21st Century, 12th International Wheelset Congress (China), 1998, p 10–13
T. Datong, Present Condition and Future Development of Axles and Wheels of Chinese Railways, 12th International Wheelset Congress (China), 1998, p 14–17
P.J. Mutton and R. Boelen, Wheel Developments for High Axle Load Operations, 4th International Heavy Haul Railway Conference (Brisbane), 1989
S.A. Parsons, D.V. Edmonds: Microstructure and Mechanical properties of Medium-carbon Ferrite Steel Microalloyed with Vanadium. Mater. Sci. Technol., 1987, 3(11), p 894–904
U.P. Singh, B. Roy, S. Jha, S.K. Bhattacharry: Microstructure and Mechanical Properties of as Rolled High Strength Bainitic Rail Steels. Mater. Sci. Technol., 2001, 17(1), p 33–38
P. Cassidy, A New Wheel Material for the New Century, 13th International Wheelset Congress (Rome), 2001
S.E. Offerman, N.H. van Dijk, M.Th. Rekveldt, J. Sietsma, S. van der Zwaag: Ferrite/Pearlite Band Formation in Hot Rolled Medium Carbon Steel. Mater. Sci. Technol., 2002, 18(3), p 297–303
U.P. Singh, A.M. Popli, D.K. Jain, B. Roy, S. Jha: Influence of Microalloying on Mechanical and Metallurgical Properties of Wear Resistant Coach and Wagon Wheel Steel. J. Mater. Eng. Perform., 2003, 12(5), p 573–580
F.G. Caballero, H.K.D.H. Bhadeshia, K.J.A. Mawella, D.G. Jones, P. Brown: Very Strong Low Temperature Bainite. Mater. Sci. Technol., 2002, 18, 279–284
T. Constable, R. Boelen, and E.V. Pereloma, The Quest for Improved Wheel Steels Enters the Martensitic Phase, 14th International Wheelset Congress (USA), Oct 2004
A. Ali: Bainitic Microstructures Formed by Split Isothermal Transformation in an Fe-C-Si-Mn-Mo Steel. Metallur. Mater. Trans. A, 1996, 27A(5), p 1141–1147
A. Zarei Hanzaki, P.D. Hodgson, S. Yue: Retained Austenite Characteristics in Thermomechanically Processed Si-Mn Transformation-Induced Plasticity Steels. Metallur. Mater. Trans., 1997, 28A(11), p 2405–2414
K. Tohji, Y. Udagawa: Double-crystal Spectrometer for Laboratory EXAFS Spectroscopy. J. Rev. Sci. Instrum., 1988, 59(7), p 1120–1127
A.T. Shuvaev, B.Y. Helmer, T.A. Lyubeznova, et al., Laboratory Diffractometer-based XAFS Spectrometer. J. Synchrotron Rad., 1999, 6 158–160
A. Airod, R. Petrov, et al., Analysis of the Trip Effect by Means of Axisymmetric Compressive Tests on a Si-Mn Bearing Steel, ISIJ Int. 2004, 44(1), p 179–180
S.S. Babu, E.D. Specht, S.A. David, E. Karapetrova, P. Zschack, M. Peet, H.K.D.H. Bhadeshia: In-situ Observation of Lattice Parameter Fluctuations in Austenite and Transformation to Bainite. Metallur. Mater. Trans. A, 2005, 36A(12), p 3281–3289
C.Y. Huo, H.L. Gao, Strain-induced Martensitic Transformation in Fatigue Crack Tip Zone for a High Strength Steel. Mater. Character., 2005, 55, p 12–18
M.Y. Sherif, C. Garcia Mateo, T. Sourmail, H.K.D.H. Bhadeshia: Stability of Retained Austenite in TRIP-assisted Steels. Mater. Sci. Technol., 2004, 20(3), p 319–322
G.I. Rees, H.K.D.H. Bhadeshia: Bainite Transformation Kinetics Part 1 Modified Model. Mater. Sci. Technol., 1992, 8(11), p 985–993
H.K. Yalci, D.V. Edmonds: The Effect of Hydrogen on the Bainite Transformation. J. Mater. Sci., 1999, 34, p 711–717
M. Zhang, L. Chen, and H. Gu, Microstructure and Mechanical Properties of Carbide-free Bainite Railway Wheels Produced by Programmed Quenching (to be published)
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Zhang, M., Qian, J. & Gu, H. The Structure Stability of Carbide-Free Bainite Wheel Steel. J. of Materi Eng and Perform 16, 635–639 (2007). https://doi.org/10.1007/s11665-007-9079-2
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DOI: https://doi.org/10.1007/s11665-007-9079-2