| 引用本文: | 刘翊之,杨才福,柴 锋,苏 航.高铜镍结构钢高温氧化层和内表层缺陷研究[J].材料科学与工艺,2013,21(6):78-83.DOI:10.11951/j.issn.1005-0299.20130614. |
| LIU Yi-zhi,YANG Cai-fu,CHAI Feng,SU Hang.Study on oxidation layer and interior surface defect under high temperature of high Cu-Ni structural steel[J].Materials Science and Technology,2013,21(6):78-83.DOI:10.11951/j.issn.1005-0299.20130614. |
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| 摘要: |
| 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1150℃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． |
| 关键词: 高铜镍结构钢 高温氧化 富Si氧化产物 内表层缺陷 热力学计算 氧化机制 |
| DOI：10.11951/j.issn.1005-0299.20130614 |
| 分类号: |
| 基金项目:国家高技术研究发展计划资助项目(2007AA03A228). |
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| Study on oxidation layer and interior surface defect under high temperature of high Cu-Ni structural steel |
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LIU Yi-zhi,YANG Cai-fu,CHAI Feng,SU Hang
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(Institute of Engineering Steel,Central Iron and Steel Research Institute, Beijing 100081,China)
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| Abstract: |
| To improve the thermal formability of high Cu-Ni structural steel, its high temperature oxidation behavior was studied and the morphology and composition were analyzed by SEM and thermodynamics calculation. The thickness of surface oxidation layer increases linearly with the holding temperature and time. Reticulation morphology interlayer with oxidation production distributing along austenite grain boundary under holing temperature above 1150℃ is defined as inner surface defect. Cu exists in oxidation layer as solid solution. The reticulation morphology interlayer can be attributed to Si rich liquid phase formed during high temperature oxidation penetrating into austenite grain boundary. High content of Ni in tested steels aggravates roughness between oxidation layer and base steel. Combination effect of Ni and Si promotes formation of complex interlayer under high temperature oxidation. |
| Key words: high Cu-Ni structural steel high temperature oxidation Si rich oxidation production inner surface defect thermodynamics calculation oxidation mechanism |
