孟祥海,王哲,王萌,李孟星,李运刚.Ce对FH40船板钢轧态组织及拉伸性能的影响[J].稀有金属材料与工程,2020,49(12):4112~4120.[Meng Xianghai,Wang Zhe,Wang Meng,Li Mengxing,LI Yungang.Effect of Ce on Rolling Microstructure and Tensile Properties of FH40 Shipbuilding Steel Plate[J].Rare Metal Materials and Engineering,2020,49(12):4112~4120.]
Ce对FH40船板钢轧态组织及拉伸性能的影响
投稿时间:2020-04-19  修订日期:2020-10-13
中文关键词:  FH40钢  轧态组织  Ce含量  针状铁素体  第二相强化
基金项目:National Natural Science Foundation of China (Project No.51974129);Natural Science Foundation of Hebei Province (Project No.E2020105187)
中文摘要:
      利用真空感应炉制备不同Ce含量的FH40实验钢,采用OM、SEM、TEM和EDS手段观察钢的轧态组织,并对其拉伸性能和断口形貌进行测试与分析,研究了Ce对FH40钢轧态组织以及拉伸强度的影响机制。结果表明,随着Ce含量从0增加到0.058%,钢的轧态组织得到细化,由多边形铁素体变为细小的等轴状铁素体,同时出现粒状贝氏体;含0.0273%Ce和0.058%Ce钢中分别产生了Ce-O-S+TiN和Ce-O-S复合夹杂物,并且分别诱发了4条和5条IAF。含0.058%Ce实验钢的屈服强度、抗拉强度较基体钢钢分别提高了31 MPa、33 MPa。当Ce含量为0.0273%时实验钢的延伸率达到了22.8%。实验钢均表现为位错强化和第二相强化,基体钢中析出相主要是Nb-Ti的复合相,含0.058%Ce实验钢中主要是Nb-Ti-Ce的复合相,且更加弥散细小,位错密度更高;同时断口形貌更加均匀,韧窝由小而浅转变为大而深,使其在切应力的作用下更不易断裂,因而提高了钢材的抗拉强度。
Effect of Ce on Rolling Microstructure and Tensile Properties of FH40 Shipbuilding Steel Plate
英文关键词:FH40 steel  rolling microstructure  Ce content  acicular ferrite  second phase strengthening
英文摘要:
      FH40 experimental steel with different Ce content was prepared by vacuum induction furnace. The rolling microstructure of the steel was observed by OM, SEM, TEM and EDS, and its tensile properties and fracture morphology were tested and analyzed. The influence mechanism of Ce on the rolling microstructure and tensile properties of FH40 steel was studied.The results show that with the increase of Ce content from 0 to 0.058%, the rolling microstructure of the steel was refined. The rolling microstructure changed from polygonal ferrite to fine equiaxed ferrite, with the formation of granular bainite. The composite inclusion sof Ce-O-S+TiN and Ce-O-S were produced in the steel containing 0.0273%Ce and 0.058%Ce, with four and five pieces of IAF induced, respectively.The yield strength and tensile strength of the experimental steel containing 0.058%Ce are 31MPa and 33MPa higher than that of the experimental steel without Ce respectively.The experimental steels showed dislocation strengthening and second phase strengthening. The precipitates in the experimental steel without Ce was mainly the composite phase of Nb-Ti. Nb-Ti-Ce was the main composite phase in the experimental steel containing 0.058%Ce, and being more dispersive and fine with higher dislocation density. The fracture morphology is more uniform. The dimple became larger and deeper, which makes it more difficult to fracture under the action of shear stress, thus improving the tensile strength of steel.
作者单位E-mail
孟祥海 华北理工大学 xianghaimeng@163.com 
王哲 华北理工大学  
王萌 唐山工业职业技术学院  
李孟星 河钢集团唐钢公司  
李运刚 华北理工大学 46957162@qq.com 
摘要点击次数: 30
全文下载次数: 3
查看全文  查看/发表评论  
关闭