作　　者： ; ; ; ; ;

机构地区： 上海交通大学材料科学与工程学院金属基复合材料国家重点实验室

出　　处： 《热加工工艺》 2012年第9期29-32,34,共5页

摘　　要： 研究了不同含铌量薄带连铸低碳钢组织性能及时效处理对含铌低碳钢组织性能的影响规律。结果表明:薄带连铸含铌低碳钢的凝固组织由柱状晶区组成,Nb含量对枝晶形貌影响不大;室温组织主要由贝氏体、针状铁素体及多边形铁素体组成,随Nb含量增加,多边形铁素体含量减少,贝氏体和针状铁素体含量增加。随铌含量增加,薄带连铸含铌低碳钢强度逐渐增加,伸长率先升高后降低。时效处理后含铌0.038wt%钢带的屈服强度提高约40MPa,抗拉强度提高约30 MPa,伸长率降低约2.3%。当时效温度为750℃保温时间为10 s时,钢带时效处理后的综合性能最好。 The microstructure and mechanical properties of Nb-microalloyed low carbon steel by strip casting with different content of niobium and the influence of aging treatment on the microstructure and mechanical properties of Nb-microalloyed low carbon steel were studied.Results show that the solidification structure of the Nb-microalloyed low carbon steel is composed of an equiaxed zone located in the middle of the strip and it doesn＇t change even if the concentration of Nb is different,but bainite,ferrite and polygonal ferrite change a lot as Niobium increases;polygonal ferrite reduces.With the concentration of Niobium increasing,the yield strength increases and elongation first increases then decreases;After aging treatment,the strip strength（Niobium： 0.038wt%） is improved,the yield strength improves about 40MPa,the tensile strength improves about 30MPa,elongation rate reduces by about 2.3%.When the aging temperature is 750℃ for 10s,the strip can get the best comprehensive performance.

关 键 词： 薄带连铸 含铌低碳钢 组织 力学性能 时效处理

领　　域： [金属学及工艺] [金属学及工艺]