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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

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【Author】 LI Xian-hao1),KANG Yong-lin1),CHEN Lin-heng1),JIAO Guohua2),WEN De-zhi2)1) School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) Hunan Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi 417009,China

【机构】北京科技大学材料科学与工程学院；湖南华菱涟源钢铁有限公司；

【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℃.更多还原

【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.更多还原

【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；
【Key words】 low carbon bainite steel； continuous cooling transformation(CCT)； microstructure evolution； thin slab casting and rolling(TSCR)；

【基金】国家自然科学基金资助项目(No.50334010)

【文献出处】北京科技大学学报 ,Journal of University of Science and Technology Beijing , 编辑部邮箱 ,2009年06期

【分类号】TG142.31
【被引频次】6
【下载频次】342

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