轧后控制冷却对非调质钢F45MnVS组织和性能的影响  

Effect of Controlled Cooling After Hot Rolling on Microstructure and Properties of Non⁃quenched and Tempered Steel F45MnVS

作　　者：梁佰战[1] 赵刚 徐浩 赵岳 LIANG Baizhan;ZHAO Gang;XU Hao;ZHAO Yue(Technology Center of Huaigang Special Steel Co Ltd,Jiangsu Shagang Group,Huai′an 223002,Jiangsu,China;Examination Center of Huaigang Special Steel Co Ltd,Jiangsu Shagang Group,Huai′an 223002,Jiangsu,China;Steel Mill of Huaigang Special Steel Co Ltd,Jiangsu Shagang Group,Huai'an 223002,Jiangsu,China)

机构地区：[1]江苏沙钢集团淮钢特钢股份有限公司技术中心,江苏淮安223002 [2]江苏沙钢集团淮钢特钢股份有限公司检测中心,江苏淮安223002 [3]江苏沙钢集团淮钢特钢股份有限公司轧钢厂,江苏淮安223002

出　　处：《矿冶工程》2023年第3期176-179,共4页Mining and Metallurgical Engineering

摘　　要：对非调质钢F45MnVS进行轧后控制冷却试验,对比了轧后未冷却与控制冷却的钢材热轧态力学性能、脱碳层和显微组织。结果表明,轧后控制冷却对钢材下屈服强度、延伸率、断面收缩率和常温冲击功均有明显改善作用;钢材表面脱碳层在轧后控制冷却条件下可以得到有效控制,甚至脱碳层“消失”;在钢材轧后表面温度冷却至650℃时,表层区域出现少量粒状贝氏体,而在钢材轧后表面温度冷却至460℃时,表层区域出现大量粒状贝氏体。轧后控制冷却使钢材表层区域和1/2半径附近的铁素体和珠光体组织被细化,铁素体网状比例降低,长条铁素体转变为块状铁素体;因钢材尺寸较大,心部区域显微组织差异性较小。An experiment on non⁃quenched and tempered steel F45MnVS was carried out by adopting controlled cooling after hot rolling.The mechanical properties,decarburized layer and microstructure of rolled steel without cooling and after controlled cooling process were compared for analysis.The results show that controlled cooling after hot rolling can lead to the steel with yield strength,elongation,section shrinkage and impact energy improved all,and with the decarburized layer being effectively controlled or even“disappeared”.With the surface temperature of the hot⁃rolled steel decreased to 650℃,granular bainite begins to occur on the steel surface;with the surface temperature down to 460℃,much granular bainite occurs on the steel surface.It is shown that by using controlled cooling after hot rolling,the ferrite and pearlite on the steel surface and near 1/2 radius on the cross section of the steel become fine⁃grained.The total ferrite net is reduced,and long strip ferrite is transformed to blocky ferrite.Due to larger size,the central part of steel shows little difference in the microstructure.

关 键 词：控制冷却 热轧 非调质钢 F45MnVS 显微组织 力学性能 

分 类 号：TG142[一般工业技术—材料科学与工程]