为了改善高铜镍结构钢的热加工性能,对其高温氧化行为进行了研究.通过扫描电镜和热力学计算分析了氧化层的形貌和组成.研究表明:实验钢氧化层厚度随温度的升高和时间的延长基本呈线性增大;温度高于l 150℃条件下氧化层和基体间出现氧化产物沿奥氏体晶界分布的网状过渡层,该结构属于一种内表层缺陷.Cu以固溶体形式存在于氧化层中.高温氧化过程中形成的富Si液相向奥氏体晶界渗透是形成这种内表层缺陷的主要原因,而钢中含量较高的Ni加大了氧化层与基体间界面的粗糙度,两种元素协同作用促进形貌复杂的过渡层的形成.
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