卷取温度与冷却速率对含铌热轧双相钢显微组织与拉伸性能的影响  

Effect of Coiling Temperature and Cooling Rate on Microstruture and Tensile Properties of Niobium Containing Hot-Rolled Dual Phase Steel

作　　者：李秋鹤[1] 应传涛 孟贺[1] 贺亮 蒋福泰 LI Qiuhe;YING Chuantao;MENG He;HE Liang;JIANG Futai(School of Mechanical Engineering,Yingkou Institute of Technology,Yingkou 115014,China;Bayuquan Iron&.Steel Subsidiary Company of Angang Co.,Ltd.,Yingkou 115010,China)

机构地区：[1]营口理工学院机械与动力工程学院,营口115014 [2]鞍钢股份鲅鱼圈分公司,营口115010

出　　处：《机械工程材料》2023年第4期45-49,96,共6页Materials For Mechanical Engineering

基　　金：辽宁省自然基金指导计划项目(2019-ZD-0366);辽宁省自然科学基金资助项目(2020-YKLH-34)。

摘　　要：将含铌双相钢在相同工艺参数下进行热轧并分别以冷却速率60℃·s^(-1)一次水冷至610℃或不同冷却速率两段式水冷至461,434,410℃后进行卷取,分析了卷取温度和冷却速率对热轧双相钢显微组织和拉伸性能的影响。结果表明:4种工艺下热轧双相钢组织均主要由铁素体和马氏体构成,在卷取温度为461℃以下时还出现了贝氏体;随着卷取温度的降低,马氏体含量降低,贝氏体依次呈分散颗粒状、聚集颗粒状和板条状,热轧双相钢的屈服强度增大,抗拉强度先减小后增大,屈强比增大,断后伸长率先增大后减小;当以一次和二次冷却速率分别为53,79℃·s^(-1)两段式水冷至461℃进行卷取后,热轧双相钢的拉伸性能最佳,平均屈服强度、平均抗拉强度、平均断后伸长率分别为459 MPa,591 MPa,35.63%。Niobium containing dual phase steel hot-rolled under the same process parameters was cooled to 610℃ by primary water cooling at a cooling rate of 60 C·s^(-1)or to 461,434,410℃ by two-stage water cooling at different cooling rates and coiled.The effects of the coiling temperature and cooling rate on the microstructure and tensile properties of the hot-rolled dual phase steel were analyzed.The results show that the microstructures of the hot-rolled dual phase steel under the four processes were all mainly composed of ferrite and martensite,and bainite appeared at the coiling temperature of 461℃and below.With the decrease of coiling temperature,the content of martensite decreased,and the bainite presented dispersed granular,aggregated granular and lath shape successively.The yield strength of the hot-rolled dual phase steel increased,the tensile strength first decreased and then increased,the yield ratio increased,and the precentage elongation after fracture first increased and then decreased.When two-stage water cooling at primary and secondary cooling rates of 53,79℃·s^(-1)to 461℃and coiling,the tensile properties of the hot-rolled dual phase steel were the best,with the average yield strength,average tensile strength,and average precentage elongation after fracture of 459 MPa,591 MPa,and 35.63%,respectively.

关 键 词：卷取温度 冷却速率 组织形貌 热轧双相钢 拉伸性能 

分 类 号：TG230[金属学及工艺—铸造]