运用TEM和EDS等测试方法,对高铌X80管线钢连铸过程微合金元素的析出行为进行研究.结果表明:铸坯凝固冷却至1100℃时,存在片层状以及棒状析出物,此类析出物为Nb(C,N)碳氮化物,同时存在一些TiN析出物.当铸坯冷却至900℃时,开始出现中心富钛、边部富铌的(Nb,Ti)(C,N)星形和枝晶形碳氮化物.当铸坯冷却至750℃时,枝晶状析出物增多,同时也存在部分富铌的枝晶状Nb(C,N)碳氮化物.冷却至室温的铸坯晶界上存在大量的枝晶状析出物.由热力学计算和试验结果得出,对于高铌X80管线钢,枝晶状复合析出物开始析出温度介于1000～1100℃之间.
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