CSP生产600MPa级低碳贝氏体钢的相变  

Continuous cooling transformation of 600 MPa grade low carbon bainite steel produced by CSP process

作　　者：黎先浩[1] 康永林[1] 陈林恒[1] 焦国华[2] 温德智[2] 

机构地区：[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

出　　处：《北京科技大学学报》2009年第6期701-707,共7页Journal of University of Science and Technology Beijing

基　　金：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℃.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.

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 

分 类 号：TG142.2[一般工业技术—材料科学与工程]