热处理对不同碳含量3.5Ni钢力学性能和低温韧性的影响  

Effect of heat treatment on mechanical properties and low temperature toughness of 3.5Ni steel with different carbon content

作　　者：刘海生[1] 李敬[1] 王会刚[1] 杨跃辉[1] 刘金旭 武会宾 Liu Haisheng;Li Jing;Wang Huigang;Yang Yuehui;Liu Jinxu;Wu Huibin(Key Lab of Intelligent Equipment Digital Design and Process Simulation,Hebei Province,Tangshan University,Tangshan Hebei 063000,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]唐山学院河北省智能装备数字化设计及过程仿真重点实验室,河北唐山063000 [2]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《金属热处理》2021年第10期182-186,共5页Heat Treatment of Metals

基　　金：河北省自然科学基金(E2019105101)。

摘　　要：利用光学显微镜及SEM进行组织观察,通过拉伸和低温冲击试验研究了热处理对两种不同碳含量3.5Ni钢的力学性能和低温韧性的影响。两种3.5Ni钢热轧板分别经860℃×1 h空冷的正火处理和860℃×1 h水淬+(580,610,640)×1 h回火的调质处理。结果表明:含碳量较高的3.5Ni钢热轧态强度低塑性高,但-100℃冲击吸收能量低,经正火处理后试验钢的整体性能降低,而调质处理后强度和低温冲击吸收能量均明显提升,塑性略有降低;含碳量较低的3.5Ni钢热轧态已经具有优异的拉伸性能和低温冲击性能,经热处理后拉伸性能和低温韧性没有得到明显提升。Effect of heat treatment on mechanical properties and low temperature toughness of two types of 3.5Ni steel with different carbon contents was studied by means of tensile testing and low temperature impact testing,and the microstructure of the steel was observed by means of optical microscope and SEM.The heat treatment of the two types of 3.5Ni steel hot-rolled plates were normalizing(860℃for 1 h,air cooling)and quenching and tempering(860℃for 1 h,water quenching and then tempering at 580,610 and 640℃for 1 h).The results show that the 3.5Ni steel with high carbon content has low strength and high absorbed plasticity after hot rolling,but low impact absorbed energy at-100℃.After normalizing treatment,the overall properties of the tested steel are decreased,while after quenching and tempering treatment,the strength and low temperature impact absorbed energy are significantly improved,while the plasticity is slightly reduced.The 3.5Ni steel with low carbon content has excellent tensile properties and low temperature impact properties after hot rolling,but the tensile properties and low temperature toughness have no significant improvement after heat treatment.

关 键 词：3.5NI钢 热处理 低温韧性 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]