Paper Title:
The Effects of Si and Deformation on the Phase Transformation in Dual Phase Steels
  Abstract

The effect of Si on phase transformation was well known in dual phase steels. Si promoted the ferrite transformation and the enriched C in untransformed austenite prohibited the transformation at intermediate temperature range resulting in the formation of lower bainite and martensite at low temperature range. In addition, during continuous cooling with fast cooling rate, it was very hard to differentiate one phase from the others. In order to clarify the effects of Si on the austenite-to-ferrite transformation quantitatively, the start temperatures of bainite(BS) and martensite(MS) as well as ferrite(Ae3) and pearlite(Ae1) were calculated by thermodynamic analysis. LVDT measured by dilatometer and 1st differentiation peaks of LVDT were examined with microstructures, which gives a possibility of the phase separation. In CCT diagrams, it was also found that large austenite grain size(AGS) widened the gap between the transformation start(Ts) and end(Tf) when Si was added.

  Info
Periodical
Solid State Phenomena (Volumes 124-126)
Edited by
Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park
Pages
1617-1620
DOI
10.4028/www.scientific.net/SSP.124-126.1617
Citation
S. H. Lee, J. M. Choi, Y. R. Cho, K. J. Lee, "The Effects of Si and Deformation on the Phase Transformation in Dual Phase Steels", Solid State Phenomena, Vols. 124-126, pp. 1617-1620, 2007
Online since
June 2007
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