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以含稀土Ce的Q345B连铸钢坯为研究对象,采用Gleeble-1500D热模拟试验机模拟第三类脆性区,研究实验钢的最低塑形谷底。结果表明:含稀土Ce的Q345B钢,随拉伸温度的升高,抗拉强度降低。含0.009 1%Ce的Q345B钢在第三类脆性温度区(600~900℃),在800℃出现塑形谷底。经金相显微组织分析,奥氏体晶界上薄膜状先共析铁素体不是造成热塑性较差的主要原因。
Taking Q345B continuous casting billets containing rare earth Ce as the research object, the third type of brittle zone was simulated by Gleeble-1500D thermal simulation testing machine to study the lowest shaped trough of experimental steel. The results show that the tensile strength of Q345B steel with rare earth Ce decreases with the increase of drawing temperature. Q345B steel containing 0.009 1% Ce exhibited a shaped valley bottom at 800 ℃ in the third type of brittle temperature zone (600-900 ℃). Metallographic microstructure analysis shows that the film-like pro-eutectoid ferrite on the austenite grain boundaries is not the main reason for poor thermoplasticity.