890MPa级纳米碳化物强化铁素体高强钢的研制  

Development of 890 MPa grade high strength hot-rolled ferritic steel precipitation-strengthened by nanometer carbides

作　　者：王振强[1] 刘春明[1] 顾林豪[1] 马长文[1] 杨志刚[2] 孙新军[3] 

机构地区：[1]首钢技术研究院宽厚板研究所,北京100043 [2]清华大学材料学院,北京100084 [3]钢铁研究总院工程用钢研究所,北京100081

出　　处：《材料热处理学报》2015年第10期117-123,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51171087)

摘　　要：通过Ti-V-Nb-Mo复合微合金化设计、控轧控冷(TMCP)及合理选择卷取温度,开发出抗拉强度为890 MPa级铁素体高强钢。结果表明,经两阶段控轧后冷却到600℃进行模拟卷取,钢板的屈服强度达到877 MPa,抗拉强度达到950 MPa,伸长率为20.0%,显微组织为均匀细小的多边形铁素体+少量晶界渗碳体。强化机理分析表明,析出强化和细晶强化是铁素体高强钢的主要强化方式,其中析出强化增量高达380 MPa。A new high strength hot-rolled ferritic steel with tensile strength of 890 MPa grade was developed by Ti-V-Nb-Mo complex microalloying design,thermo-mechanical control process（ TMCP） and the selection of coiling temperature. Results show that by two-stage control rolling,coiling at 600 ℃ for 30 min and then furnace-cooling to room temperature,the yield strength,tensile strength and elongation of the developed steel can reach 877 MPa,950 MPa and 20. 0%,respectively,and the microstructure of the steel is consist of uniform ferrite with grain size of 5 μm and a small amount of cementite at the ferrite grain boundary. Strengthening mechanism analysis reveals that the steel is strengthened mainly by a combined effect of precipitation hardening and ferrite grain refinement. The amount of precipitation hardening due to nanometer carbides can reach 380 MPa.

关 键 词：纳米碳化物 铁素体钢 高强钢 析出硬化 

分 类 号：TG142.11[一般工业技术—材料科学与工程]