【摘要】 25mm、 32mm两种规格HRB400抗震钢筋的系列冲击试验表明,大规格试验钢筋的韧脆转变温度较高。由光学显微镜观察和断口扫描,发现 32mm钢筋的晶粒较为粗大、在12℃条件下主要为脆性断裂,借助透射电镜分析了钒在钢筋中的存在形式和分布情况。建议采用钒氮合金化与控制轧制相结合的措施来提高HRB400钢筋的低温冲击性能。更多还原

【Abstract】 Series of impact test for HRB400 anti-seismic steel bars with diameters of 25 mm and 32 mm dedicate the ductile-brittle transition temperature of big size steel bars are higher than small ones. Light microscope observation reveals the 32 mm steel bar has coarse grain , SEM show brittle fracture take place at 12 ℃. TEM was used to analyze the form and distribution of vanadium, then vanadium-nitrogen alloying and controlled rolling was brought forward as a suggest to enhance the impact property of HRB400 steel bars at low temperature.更多还原