On Phase Transformation Induced Effects Controlling the Flow Behavior of Ferritic-Martensitic Dual-Phase Steels

2018 ◽  
pp. 47-58
Author(s):  
A. Fillafer ◽  
E. Werner ◽  
C. Krempaszky
Keyword(s):  
Phase Transformation ◽  
Flow Behavior ◽  
Dual Phase ◽  
Dual Phase Steels

The Effects of Si and Deformation on the Phase Transformation in Dual Phase Steels

2007 ◽  
Vol 124-126 ◽  
pp. 1617-1620 ◽  
Author(s):  
Sang Hwan Lee ◽  
Jong Min Choi ◽  
Yeol Rae Cho ◽  
Kyung Jong Lee
Keyword(s):  
Phase Transformation ◽  
Lower Bainite ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Austenite Grain Size ◽  
Temperature Range ◽  
Intermediate Temperature Range ◽  
Ferrite Transformation ◽  
Untransformed Austenite ◽  
Cct Diagrams

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.

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