Metallurgical Characterization of Bainitic Steel by Eddy Current Method
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.
KeywordsBainitic steel Eddy current testing Low alloy steels
- 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.G.A. Roberts, J.C. Hamaker, A.R. Johnson (eds.), Tool Steels, 3rd edn. (ASM Metals, Metals park, 1971)Google Scholar
- 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
- 12.G.V. Drunen, V.S. Cecco, Recognizing limitations in Eddy current testing. NDT Int 17, 378–383 (1984)Google Scholar
- 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