Effect of austenite grain size and accelerated cooling start temperature on the transformation behaviors of multi-phase steel  

作　　者：LI XiuCheng XIA DianXiu WANG XueLin WANG XueMin SHANG ChengJia 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing

出　　处：《Science China(Technological Sciences)》2013年第1期66-70,共5页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China ("973" Program) (Grant No. 2010CB630801)

摘　　要：The transformation behaviors and microstructures of a low carbon multi-phase steel were investigated by the simulation of deformation-relaxation-accelerated cooling processing,using a Gleeble 3500 thermal-mechanical simulator.A pre-treatment of solid solution at 1200°C was implemented to minimize the influence on transformation from solid solution/precipitation qualities of 0.08%Nb in this steel.On this basis,the effect of austenite grain size and accelerated cooling start temperature were studied individually.The results indicated that the transformation of ferrite in multi-phase steel could be significantly promoted by the refinement of austenite grains and the increase of relaxation time,while the hard phase,such as lath bainite or martensite,could still be obtained with the following accelerated cooling.In contrast,more uniform lower temperature transformed microstructure could form from coarse grain austenite.The potential benefit of austenite grain size on adjusting the proportion of phases in multiphase steel was also discussed.

关 键 词：multi-phase steel austenite grain size relaxation time ferrite transformation 

分 类 号：TG142.1[一般工业技术—材料科学与工程]