Microstructure evolution of a 22Si2MnCrNi2MoA steel during continuous cooling transformation was studied on a Gleeble-1500 thermo-mechanical simulator, and the behavior of static and dynamic continuous cooling phase transformation was examined. The role of alloy elements and influences of cooling rate and deformation condition on the CCT (continuous cooling transformation) curves, microstructure and mechanical property of the steel were analyzed. The results show that alloy elements of Mn, Cr, Mo and Ni in 22Si2MnCrNi2MoA steel are favourable for getting duplex microstructure of martensite and bainite in a wider range of cooling rate. It is found that the accelerating effect of deformation on bainite transformation enhances as the cooling rate increases and the polygonal ferrite formation gets weakened. Besides, the morphology of bainite changes when the cooling rate increases. Thermal deformation of the parent austenite promotes both ferrite and bainite transformations. In addition, the bainite lathes are refined by thermal deformation. The martensitic start temperature also decreases slightly by the deformation.
|ジャーナル||Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment|
|出版ステータス||Published - 2013 1月|
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