J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (03): 383-388.

• Research Articles • Previous Articles     Next Articles

A Quantitative Analysis of Mn Segregation at Partitioned Ferrite/Austenite Interface in a Fe-C-Mn-Si Alloy

H. Guo, S.W. Yang, C.J.Shang, X.M. Wang, X.L. He   

  1. Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2007-10-18 Revised:2009-01-09 Online:2009-05-28 Published:2009-10-10
  • Contact: Hui Guo
  • Supported by:

    the National Natural Science Foundation of China under grant No. 50601002
    the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.

Abstract:

Mn segregation at austenite/ferrite interface is studied in a Fe-C-Mn-Si alloy held at 656°C. Mn is partitioned during the growth of ferrite and as a result, a Mn pile-up exists in front of interface on the matrix side. An approach to evaluate Mn segregation quantitatively is developed by combining STEM raster window scanning and simulation of the interaction of the electron beam with the sample to subtract the contribution of Mn pile-up and obtain pure Mn segregation value. The evaluated maximum Mn interfacial segregation is in the order of a half-monolayer.

Key words: Interfacial segregation, Phase transformation STEM, Beam broadening