摘要:
为适应建筑用钢升级换代发展的需求,开展了高氮钒铬微合金化工艺试制600 MPa高强抗震钢筋工业试验,采用拉力试验机、材料试验机、金相显微镜、透射电镜、X射线衍射仪,对钢筋力学性能、疲劳寿命、显微组织、析出相及夹杂物进行检验分析。结果表明:钢筋具有良好的抗震性、强韧性、疲劳性及高低温拉伸性能,综合性能优异;钢的显微组织为铁素体+珠光体(含量42%~48%),铁素体晶粒度大于10.5级,组织细小及分布均匀;钢的铁素体基体、晶界及位错线上析出了大量尺寸2~30 nm的细小弥散的V(CN)析出相,析出相数量占总钒量的70%以上,V的析出强化效果得到充分发挥;钢中夹杂物数量少、尺寸小,有利于塑韧性的改善。
Abstract:
In order to meet the needs of the upgrading development for construction steel,preparation of 600 MPa anti-seismic rebars by nitrogen-rich V-Cr microalloyed technology in domestic steel plant was carried out.The mechanical properties,fatigue performance,microstructure,precipitates and inclusions of the obtained rebars were tested and analyzed using tensile testing and material testing machines,metallographic microscopy,transmission electron microscopy and X-ray diffraction apparatus,respectively.The results show that the tested rebars feature favorable comprehensive properties with good strengthtoughness performance,anti-seismic properties,fatigue performance,high and low temperature tensile properties.The microstructure of the tested rebars are consisted of ferrite and pearlite(content 42%~48%),and the size of ferrite grains is greater than 10.5 grade with small and uniformly distributed particles.A large number of small and diffuse V(CN) precipitates sized 2~30 nm are formed and distributed on ferrite matrix,grain boundaries and dislocation lines,and the fraction of V(CN) precipitates is more than 70% to the total vanadium content.Meanwhile,there are a spot of small sized inclusions in the steel,which is helpful to improve the plasticity and toughness of the rebars.
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