TESTING AND ANALYSING FOR DUCTILE-BRITTLE TRANSITION TEMPERATURE OF HRB400 ANTI-SEISMIC STEEL BAR
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摘要: Ø25mm、Ø32mm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Ø32mm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。Abstract: Series of impact test for HRB400 anti-seismic steel bars with diameters of Ø25 mm and Ø32 mm dedicate the ductile-brittle transition temperature of big size steel bars are higher than small ones. Light microscope observation reveals the Ø32 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.
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