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CSP生产600 MPa级低碳贝氏体钢的相变
引用本文:黎先浩,康永林,陈林恒,焦国华,温德智.CSP生产600 MPa级低碳贝氏体钢的相变[J].北京科技大学学报,2009,31(6).
作者姓名:黎先浩  康永林  陈林恒  焦国华  温德智
作者单位:1. 北京科技大学材料科学与工程学院,北京,100083
2. 湖南华菱涟源钢铁有限公司,娄底,417009
基金项目:国家自然科学基金资助项目(No.50334010)
摘    要:以低碳Nb、V、Ti、Mo和Cr合金化贝氏体钢为研究对象,在Formaster-Digital膨胀仪上测定了过冷奥氏体的静态CCT曲线;在Gleeble-1500热/力模拟机上,用膨胀法测定了奥氏体的动态CCT曲线;采用扫描电镜和透射电镜分析了贝氏体钢的室温组织演变规律.结果表明:合金元素抑制奥氏体向铁素体转变,在冷却速度大于10℃.s-1的范围内,静态CCT和动态CCT的室温组织均为贝氏体,具有较高的强度;奥氏体变形促进了贝氏体转变,贝氏体转变开始温度为610~668℃,终了温度为520~551℃.

关 键 词:低碳贝氏体钢  连续冷却转变  组织演变  薄板坯连铸连轧  

Continuous cooling transformation of 600 MPa grade low carbon bainite steel produced by CSP process
LI Xian-hao,KANG Yong-lin,CHEN Lin-heng,JIAO Guo-hua,WEN De-zhi.Continuous cooling transformation of 600 MPa grade low carbon bainite steel produced by CSP process[J].Journal of University of Science and Technology Beijing,2009,31(6).
Authors:LI Xian-hao  KANG Yong-lin  CHEN Lin-heng  JIAO Guo-hua  WEN De-zhi
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 microstruc-tures 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.
Keywords:low carbon bainite steel  continuous cooling transformation (CCT)  microstructure evolution  thin slab casting and rolling (TSCR)
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