Ti含量对460 MPa级微合金钢组织和性能的影响  

Effect of Ti Content on Microstructure and Properties of 460 MPa Grade Microalloyed Steel

作　　者：徐海健 韩楚菲 王海丹 车欣[3] 马正阳 Xu Hajan;Han Chufei;Wang Haidan;Che Xin;Ma Zhengyang(Angang Steel Co.,Ltd.;State Key Laboratory of Metal Material for Marine Equipment and Application;Shenyang University of Technology)

机构地区：[1]鞍钢股份有限公司 [2]海洋装备用金属材料及其应用国家重点实验室 [3]沈阳工业大学

出　　处：《宽厚板》2025年第1期1-5,共5页Wide and Heavy Plate

摘　　要：利用光学显微镜、扫描电子显微镜和透射电子显微镜观察不同Ti含量的460 MPa级微合金钢组织及析出相演变规律,并进行室温拉伸性能、-20℃冲击功和-10℃落锤实验测试。实验结果表明:采用Ti微合金强化460 MPa级微合金钢的微观组织、力学性能等指标均满足同级别建筑结构用钢、管线钢的标准,且性能指标优异。随着Ti含量增加,基体内弥散分布的高密度富钛纳米析出相的数量逐渐增加,多边形铁素体尺寸变细,珠光体形态退化,均匀细小的针状铁素体比例增加,材料强韧性得到明显改善。在成本明显降低的基础上,鞍钢成功开发出组织性能优异的Ti微合金化460 MPa级微合金钢板。The microstructure and evolution of precipitated phase of 460 MPa grade microalloyed steel with differ-ent Ti contents are observed by optical microscope,scanning electron microscope and transmission electron microscope.Tensile properties at room temperature,impact power at-20 C and Drop-Weight Tear Test at-10℃arecarried out.The experimental results show that the microstructure and mechanical properties of 460 MPa grade microalloyed steel strengthened by Ti microalloy meet the standards of the same grade building structure steel and pipeline steel,and the performance indexes are excellent.With the increase of Ti contents,the number of high-density titanium-rich nano-precipitates gradually increases,the size of polygonal ferrite decreases,the pearlite decreases,the proportion of uniform fine acicular ferrite increases,the strength and toughness of the material are obviously improved.On the basis of significant cost reduction,Angang has successfully developed Ti microalloyed 460 MPa grade microalloy steel plate with excellent microstructure properties.

关 键 词：微观组织 微合金钢 Ti微合金强化 强韧性 

分 类 号：TG1[金属学及工艺—金属学]