东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (9): 1237-1241.DOI: 10.12068/j.issn.1005-3026.2018.09.005

• 材料与冶金 • 上一篇    下一篇

X80管线钢的高温氧化行为

曹光明, 林飞, 李志峰, 刘振宇   

  1. (东北大学 轧制技术及连轧自动化国家重点实验室, 辽宁 沈阳110819)
  • 收稿日期:2017-05-15 修回日期:2017-05-15 出版日期:2018-09-15 发布日期:2018-09-12
  • 通讯作者: 曹光明
  • 作者简介:曹光明(1982-),男,四川绵阳人,东北大学副教授; 刘振宇(1967- ),男,内蒙古赤峰人,东北大学教授,博士生导师.冯明杰(1971-), 男, 河南禹州人, 东北大学副教授; 王恩刚(1962-), 男, 辽宁沈阳人, 东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(U1660117); “十二五”国家科技支撑计划项目(2011BAE13B04).国家自然科学基金资助项目(51171041).

High-Temperature Oxidation Behavior of X80 Pipeline Steel

CAO Guang-ming, LIN Fei, LI Zhi-feng, LIU Zhen-yu   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2017-05-15 Revised:2017-05-15 Online:2018-09-15 Published:2018-09-12
  • Contact: CAO Guang-ming
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摘要: 利用热重法对X80管线钢高温氧化行为进行系统研究,分析不同温度下氧化增重和氧化铁皮形貌演变规律及合金元素在氧化层与钢基体界面处的分布规律.实验结果表明:700~1200℃范围内,X80钢氧化增重曲线呈现抛物线规律.此外,氧化铁皮厚度随温度升高而增加,特别是当温度高于800℃时,由于金属基体存在相变,氧化铁皮厚度急剧增加.高温条件下X80钢氧化铁皮为典型三层结构,外层为极薄的Fe2O3,中间层为Fe3O4,内层为粗大柱状晶FeO,并在靠近钢基体处形成一层晶粒细小的内氧化层,内氧化层阻碍了铁氧离子的相互扩散,提高了X80管线钢的高温耐蚀性.

关键词: X80管线钢, 氧化铁皮, 离子扩散, 相变, 内氧化

Abstract: The high-temperature oxidation behavior of X80 pipeline steel was studied systematically by the thermogravimetric analysis. The oxidation weight gain, morphologies of the oxide scale and the distribution of alloying elements at the oxide/substrate interface at different temperatures were analyzed. The results show that in the range of 700~1200℃, the curves of oxidation weight gain of X80 steel follow the parabolic law and the thickness of the oxide scale increases with the temperature, especially when the temperature is higher than 800℃, owing to the phase transformation in the substrate. The oxide scale of X80 steel has a typical three-layer structure at high temperature, consisting of the outer thin Fe2O3 layer, the middle Fe3O4 layer and the inner FeO layer with the coarse columnar. Also, there is an internal oxidation layer with fine grains formed near the steel substrate. The internal oxidation layer suppresses the interdiffusion of iron and oxygen ions, and improves the high-temperature corrosion resistance of X80 pipeline steel.

Key words: X80 pipeline steel, oxide scale, ion diffusion, phase transformation, internal oxidation

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