摘要
依据高应变低周疲劳寿命及循环韧度为核心的评价体系,综合分析了VN微合金化、穿水冷却及细晶粒三种工艺生产的400 MPa级钢筋未加工表面试样的综合抗震性能。结果表明,钒微合金化钢筋在高应变低周疲劳循环韧度、焊接性、应变时效敏感性和低温韧性等方面具有明显的优势,综合抗震性能较高。循环过程中TEM照片表明,钒在钢筋中细小弥散的析出,促进循环过程中塑性变形均匀分布,同时发展成胞壁厚、胞壁中位错密度高的位错胞结构,吸收大量变形功,使V微合金化钢筋具有最高循环韧度。
Comprehensive seisimic performance of grade 400 MPa rebars manufactured by V-N microallo- ying, QST and fine-grained process routines was experimentally evaluated according to increasingly ac- cepted earthquake resistant evaluation index based on high strain low cycle fatigue behavior. Vanadium microalloyed rebar shows clear advantage over QST and fine-grained processed rebar in terms of high strain low cycle fatigue life and cyclic toughness, weldability, strain aging sensibility and FATI＂ as well. TEM photos reveal formation of dislocation cells with thicker wall and high density dislocation during cy- clic loading which results in deformation energy dissipation due to the existence of fine dispersed V （C, N） particles, consequently facilitated uniform plastic deformation and leads to highest cyclic tough- ness value of V microalloying rebar.
出处
《钢铁钒钛》
CAS
北大核心
2013年第6期72-78,共7页
Iron Steel Vanadium Titanium
关键词
钢筋
抗震性能
高应变低周疲劳
循环韧度
rebar, seismic performance, high strain low cycle fatigue, cyclic toughness
