Journal of Failure Analysis and Prevention

, Volume 16, Issue 6, pp 1121–1125 | Cite as

Metallurgical Characterization of Bainitic Steel by Eddy Current Method

Technical Article---Peer-Reviewed
  • 79 Downloads

Abstract

Bainite is a decomposition product of austenite consisting of an aggregate of ferrite and carbides. In general, it forms at temperatures lower than those where very fine pearlite forms and higher than those where martensite begins to form on cooling. In the present work, a bainitic structure steel comprised of plate-like ferrite grains, inside which carbide particles can be seen, have been prepared. The microstructural evaluation is performed at different temperatures. These steels are characterized by optical microscopy, hardness testing, and eddy current testing system. It is found that there is a relationship between hardness and eddy current. Thus, eddy current technique found effective tool to identify the condition of microstructure at different temperatures.

Keywords

Bainitic steel Eddy current testing Low alloy steels 

References

  1. 1.
    H.K. Moon, K.B. Lee, H. Kwon, Influences of Co addition and austenitizing temperature on secondary hardending and impact fracture behavior in P/M high speed steels of W–Mo–Cr–V(–Co) system. Mater. Sci. Eng. A 474(1–2), 328–334 (2008)CrossRefGoogle Scholar
  2. 2.
    R.K.D. Misra, T.V. Balasubramanian, P.R. Rao, Acta Metall. 35, 2995–3000 (1987)CrossRefGoogle Scholar
  3. 3.
    R.K.D. Misra, T.V. Balasubramanian, P.R. Rao, Acta Metall. 37, 1475–1483 (1989)CrossRefGoogle Scholar
  4. 4.
    F.A. Khalid, D.V. Edmonds, in Precipitation and transformation microtwinning in Micoalloyed Engineering Alloys, proceedings of the international conference on solid-solid phase transformation, ed. by W.O. Johnson, J.M. Howe, D.E. Laughlin, W.A. Sofia (The Minerals, Metals and Materials Society, Pennsylvania, 1994), pp. 231–236Google Scholar
  5. 5.
    G.A. Roberts, J.C. Hamaker, A.R. Johnson (eds.), Tool Steels, 3rd edn. (ASM Metals, Metals park, 1971)Google Scholar
  6. 6.
    J.W. Liaw, S.L. Chu, C.S. Yeh, M.K. Kuo, Analysis of eddy currents in a bar containing an embedded defect. NDT&E 32, 293–303 (1999)CrossRefGoogle Scholar
  7. 7.
    F. Roper, A high-frequency eddy current method for the thickness measurement of thin metallic foils using ferrite-core transmission systems. NDT&E 33, 163–172 (2000)CrossRefGoogle Scholar
  8. 8.
    L.H. Ichinose, Y. Kohno, T. Kitada, M. Matsumura, Applications of eddy current test to fatigue crack inspection of steel bridges. Mem. Fac. Eng. 48, 57–62 (2007)Google Scholar
  9. 9.
    L. Janousek, Z. Chen, N. Yusa, K. Miya, Excitation with phase shifted fields-enhancing evaluation of deep cracks in eddy current testing. NDT&E 38, 508–515 (2005)CrossRefGoogle Scholar
  10. 10.
    G.Y. Tian, A. Sophian, Defect classification using a new feature for pulsed eddy current sensors. NDT&E 38, 77–82 (2005)CrossRefGoogle Scholar
  11. 11.
    S. Konoplyuk, T. Abe, T. Uchimoto, T. Takagi, M. Kurosawa, Characterization of ductile cast iron by Eddy current method. NDT&E 38, 623–626 (2005)CrossRefGoogle Scholar
  12. 12.
    G.V. Drunen, V.S. Cecco, Recognizing limitations in Eddy current testing. NDT Int 17, 378–383 (1984)Google Scholar
  13. 13.
    M. Kang, M.X. Zhang, F. Liu, M. Zhu, Kinetics and Morphology of isothermal transformations at intermediate temperature in 15CrMnMoV steel. Mater Trans JIS 50(1), 123–129 (2009)CrossRefGoogle Scholar
  14. 14.
    L. Yong, Z. Zhongping, S. Guangfu, Z. Liquan, Y. Wanhua, H. Jingtao, Analysis on vanadium’s impact on metallographic transitions of HSLA steel, international seminar 2005 on application technologies of vanadium in flat—rolled steels (2005), pp 105–109Google Scholar
  15. 15.
    F. Perrard, C. Scott, Vanadium precipitation during intercritical annealing in cold rolled TRIP steels. ISIJ Int. 47(8), 1168–1177 (2007)CrossRefGoogle Scholar
  16. 16.
    M. Bischof, P. Staron, D. Caliskanoglu, H. Leitner, C. Scheu, H. Clemens, On the overaging behavior of tool steel X38CrMoV 5-3. Mater. Sci. Eng. A 472(1–2), 148–156 (2008)CrossRefGoogle Scholar
  17. 17.
    E. Pippels, J. Woltersdorf, G. Pockl, G. Lichtenegger, Microstructure and nanochemistry of carbide precipitates in high-speed steel. Mater. Charact. 43, 41–55 (1999)CrossRefGoogle Scholar
  18. 18.
    H. Ohtsuka, Effects of strong magnetic fields on bainitic transformation. Curr. Opin. Solid State Mater. Sci. 8(3–4), 279–284 (2004)CrossRefGoogle Scholar

Copyright information

© ASM International 2016

Authors and Affiliations

  1. 1.Army Public College of Management and SciencesRawalpindiPakistan

Personalised recommendations