2009•Journal of University of Science and Technology BeijingRequires access
Continuous cooling transformation of 600 MPa grade low carbon bainite steel produced by CSP process
Xianhao Li
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Abstract
The static and dynamic CCT curves of low carbon bainite steel microalloyed with Nb,V,Ti,Mo and Cr were tested with a Formaster-Digital dilatometer and a Gleeble-1500 thermo-mechanical simulator,respectively.The transformation microstructures were observed by SEM and TEM.It is shown that the transformation microstructures are bainite after continuous cooling when the cooling rate is more than 10 ℃·s-1 due to the fact that alloy additions inhibit the transformation from austenite to ferrite,which results in excellent strength;in addition,deformation promotes bainite transformation,and the start temperature and final temperature of bainite transformation are 610 to 668 ℃ and 520 to 551 ℃, respectively.