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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。
According to the evaluation system with high strain, low cycle fatigue life and cycle toughness as the core, the comprehensive seismic performance of 400 MPa steel unprocessed surface samples produced by VN micro-alloying, water-cooling and fine-grained three processes was analyzed comprehensively . The results show that the vanadium microalloyed steel has obvious advantages in high strain and low cycle fatigue cycle toughness, weldability, strain aging sensitivity and low temperature toughness, and has a higher comprehensive seismic performance. TEM photographs show that during the cycling, vanadium precipitates finely and disperse in the rebar and promotes the uniform distribution of plastic deformation during the cycling. At the same time, it develops into a dislocation cell structure with thick cell wall and high dislocation density in the cell wall, absorbs a large amount of deformation work, V micro-alloyed steel with the highest cycle toughness.