Development of Ti-V-Mo Complex Microalloyed Hot-Rolled 900-MPa-Grade High-Strength Steel
Development of Ti-V-Mo Complex Microalloyed Hot-Rolled 900-MPa-Grade High-Strength Steel
复制标题
Ti—V—Mo复合微合金化热轧900MPa级高强度钢的研制
DOI：
10.1007/s40195-015-0243-7
复制
发表时间：
2015-05-01
影响因子：
3.5
通讯作者：
Zhao, Pei-Lin
中科院分区：
文献类型：
--
作者：
Zhang, Ke;Li, Zhao-Dong;Zhao, Pei-Lin
通过控制热机械控制工艺（TMCP）制度，特别是卷取温度的变化，开发了一种新型Ti-V-Mo复合微合金化热轧高强度钢板。研究了卷取温度对Ti-V-Mo复合微合金化低合金高强钢各种硬化机制和力学性能的影响。结果表明，钢的强化主要是铁素体晶粒细化强化和沉淀强化的综合作用。模拟卷取温度的变化导致强度的显著差异，这主要归因于不同的沉淀硬化增量贡献。当冷却温度为600 ℃时，试验钢的力学性能最好：抗拉强度（UTS）为1000 MPa，屈服强度（YS）为955 MPa，延伸率（EL）为17%。此外，约82wt%的总沉淀物是直径为1-10 nm的纳米尺寸的碳化物颗粒，其随机分散在铁素体基体中。纳米尺寸的碳化物颗粒导致强的沉淀硬化增量高达310 MPa。
A new Ti-V-Mo complex microalloyed hot-rolled high-strength steel sheet was developed by controlling a thermo-mechanical controlled processing (TMCP) schedule, in particular with variants in coiling temperature. The effects of coiling temperature (CT) on various hardening mechanisms and mechanical properties of Ti-V-Mo complex microalloyed high-strength low-alloy steels were investigated. The results revealed that the steels are mainly strengthened by a combined effect of ferrite grain refinement hardening and precipitation hardening. The variation in simulated coiling temperature causes a significant difference in strength, which is mainly attributed to different precipitation hardening increment contributions. When the CT is 600 degrees C, the experimental steel has the best mechanical properties: ultimate tensile strength (UTS) 1000 MPa, yield strength (YS) 955 MPa and elongation (EL) 17%. Moreover, about 82 wt% of the total precipitates are nano-sized carbide particles with diameter of 1-10 nm, which is randomly dispersed in the ferrite matrix. The nano-sized carbide particles led to a strong precipitation hardening increment up to 310 MPa.