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采用扫描电镜、透射电镜、金相显微镜、闪光焊接及力学性能测试,对国内某厂采用富氮钒微合金化生产的Φ40 mm HRB500抗震钢筋微合金析出强化效果、力学性能、金相显微组织、夹杂物、焊接及时效性进行了试验研究。结果表明:采用增氮降钒工艺增加了细小弥散的钒析出相数量,析出相尺寸为10~30 nm,其中V(CN)析出物占总w(V)的79.35%,析出强化效果显著;钢中夹杂物尺寸小且数量少,A、B、D类夹杂小于1.0级,C类夹杂小于1.5级,有利于控制钢中微裂纹的萌生与扩展,改善钢筋塑韧性;钢筋强屈比(Rm实/ReL实)不小于1.27,均匀伸长率(Agt)不小于12%,抗震性能好;自然时效1个月后强度变化平缓,具有低应变时效性;焊接试样断口远离焊接接头、焊接性能良好;生产成本和钒氮微合金化工艺相比吨钢降低20元。
The strengthening effect, mechanical properties, metallurgical microstructure and microstructure of Φ40 mm HRB500 aseptic reinforced micro-alloy produced by a plant rich in nitrogen and vanadium were investigated by scanning electron microscopy, transmission electron microscopy, metallographic microscope, flash welding and mechanical properties tests. Materials, welding and timeliness of the pilot study. The results show that the vanadium precipitation process increases the amount of fine dispersed vanadium precipitates, the precipitated phase size is 10 ~ 30 nm, of which V (CN) precipitates account for 79.35% of the total w (V), and the precipitation strengthening effect is remarkable. Small inclusions in steel and a small number, A, B, D inclusions less than 1.0, C inclusions less than 1.5, is conducive to control the initiation and expansion of micro-cracks in steel to improve the steel plastic toughness; Rm real / ReL real) is not less than 1.27, the uniform elongation (Agt) is not less than 12%, and the aseismic performance is good. After 1 month of natural aging, the strength changes gently and has low strain aging; Welding performance is good; production costs and vanadium-nitrogen micro-alloyed steel compared to reduce 20 yuan.