Ni含量对控轧控冷船舶用Nb-Ti微合金化NiCr钢组织和性能的影响  

Influence of Nickel Content on Microstructure and Mechanical Properties of Controlled Rolling and Cooling Marine Nb-Ti Microalloyed NiCr Steel

作　　者：李振华 王灏旭 李壮 蔡一钦 苗博闻 宋殿福 张利 李艳梅[2] Li Zhenhua;Wang Haoxu;Li Zhuang;Cai Yiqin;Miao Bowen;Song Dianfu;Zhang Li;Li Yanmei(College of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136;State Key Lab of Rolling and Automation,Northeastern University,Shenyang 110819)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,沈阳110136 [2]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819

出　　处：《特殊钢》2020年第3期72-75,共4页Special Steel

基　　金：十三五国家重点研发计划项目(2017YFB0305301);沈阳航空航天大学大学生创新创业训练计划项目(201910143485)资助。

摘　　要：研究了0.31%Ni和0.88%Ni二种控轧控冷Nb-Ti微合金化NiCr钢的组织和性能。结果表明,船舶用钢控轧控冷获得粒状贝氏体、上贝氏体、针状铁素体、多边形铁素体及少量珠光体等组成的复合组织。控轧控冷造成铁素体晶粒尺寸细化,细小M-A岛增多。二种钢均获得较高的抗拉强度、屈服强度、伸长率和硬度,0.88Ni-0.32Cr钢性能优于0.31Ni-0.33Cr钢。船舶用钢-80℃试样纵向冲击功都在200 J以上,0.88Ni-0.32Cr钢甚至超过了300 J。该钢中最佳的Ni含量为0.88%Ni。由于控轧控冷造成了铁素体细晶强化、M-A岛复合强化、析出强化和位错强化,合金元素镍有效的提高了船舶钢的低温冲击韧性。The microstructure and mechanical properties of controlled rolling and controlled cooling 0.31% Ni and 0.88% Ni two Nb-Ti microalloyed NiCr steel are investigated.The results show that granular bainite,upper bainite,acicular ferrite,polygonal ferrite and a little of pearlite in marine steel are obtained by controlled rolling-cooling.Controlled rolling and controll cooling result in the refinement of the ferrite grain and the increase of M-A islands.Both steels have high tensile strength,yield strength,elongation and hardness,and the mechanical properties of 0.88 Ni-0.32 Cr steel are higher than those of 0.31 Ni-0.33 Cr steel.The impact energy of longitudinal direction all of the marine steels exceeds 200 J,and that of 0.88 Ni-0.32 Cr steel exceeds 300 J at-80℃.0.88% Ni is optimum of containing nickel of steel.This is attributed to the ferrite grain refinement strengthening,M-A islands compound strengthening,precipitation strengthening and dislocation strengthening due to controlled rolling and controlled cooling.Nickel effectively improves low-temperature impact toughness of marine steel.

关 键 词：船舶用钢 控轧控冷 铁素体晶粒 M-A岛 析出强化 

分 类 号：U668.2[交通运输工程—船舶及航道工程] TG142.1[交通运输工程—船舶与海洋工程] TG335[一般工业技术—材料科学与工程]