东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (6): 792-800.DOI: 10.12068/j.issn.1005-3026.2020.06.006

• 材料与冶金 • 上一篇    下一篇

Ni系低温钢的高温氧化行为研究

曹光明， 高欣宇， 单文超， 潘帅   

  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:2019-10-31 修回日期:2019-10-31 出版日期:2020-06-15 发布日期:2020-06-12
  • 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.
  • 基金资助:
    国家重点研发计划项目(2017YFB0305002)； 国家自然科学基金联合基金项目(U1660117)； 中央高校基本科研业务费专项资金资助项目(N180704008).

High Temperature Oxidation Behavior of Ni-based Low Temperature Steel

CAO Guang-ming， GAO Xin-yu， SHAN Wen-chao， PAN Shuai   

  1. The State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.
  • Received:2019-10-31 Revised:2019-10-31 Online:2020-06-15 Published:2020-06-12
  • Contact: CAO Guang-ming
  • About author:-
  • Supported by:
    -

RichHTML

0

PDF (PC)

683

摘要： 为研究Ni系低温钢的高温氧化行为，利用Setsys Evolution型高温同步热分析仪对Fe-3.5Ni和Fe-9Ni钢在700~1200℃的氧化行为进行了研究，采用电子探针(EPMA)、场发射扫描电镜(SEM)和X射线衍射(XRD)等手段表征了氧化物微观形貌和物相组成.结果表明:700~1200℃条件下氧化2h后，Fe-3.5Ni钢和Fe-9Ni钢的氧化增重曲线规律相似，相同氧化温度条件下，单位面积Fe-9Ni钢的增重量低于Fe-3.5Ni钢.随氧化温度的升高，试样表面依次出现团絮状、晶须状和不规则多边形状Fe2O3.氧化分为内氧化和外氧化，内、外氧化层厚度随氧化温度的提高逐渐增加，且900℃是两种钢外氧化层厚度发生突变的临界温度.内氧化层由FeNi3和混合物(FeO+Fe3O4)组成，外氧化层由Fe2O3，Fe3O4和FeO组成，且外氧化层内包裹着尖晶石相NiFe2O4；随着Ni含量增加，NiFe2O4增多并形成连续的薄带.

关键词: Ni系低温钢, 高温氧化, 内氧化, 外氧化

Abstract: The oxidation behavior of Fe-3.5Ni and Fe-9Ni at 700~1200℃ was investigated using Setsys Evolution high-temperature thermal gravimetric analyzer to study the high temperature oxidation behavior of Ni-based low temperature steel. The oxide morphology and phase composition were analyzed with electron-probe microanalyzer (EPMA)， scanning electron microscopy (SEM)， X-ray diffraction (XRD). The results show that the oxidation mass gain curves of Fe-3.5Ni steel and Fe-9Ni steel are similar after oxidation for 2h at 700~1200℃. Under the same oxidation temperature， the unit area mass gain of Fe-9Ni steel is lower than that of Fe-3.5Ni steel. As the oxidation temperature increases， agglomerate floc， whisker and irregular polygonal Fe2O3 appear on the surface of the sample. Further results indicate oxidation is divided into internal and external oxidation. As the oxidation temperature increases， the thickness of the external oxide layers and subscale gradually increases， and 900℃ is the critical point at which the thickness of the outer oxide layers of the two steels changes. The subscale compound consists of FeNi3 and a mixture (FeO+Fe3O4). The external oxidation consists of Fe2O3， Fe3O4 and FeO， and the crystallite phase NiFe2O4 is encapsulated in the external oxide layer; as the Ni content increases， more NiFe2O4 is produced.

Key words: Ni-based low temperature steel, high temperature oxidation, internal oxidation, external oxidation

中图分类号: