Fe-Al-Cr合金的晶粒控制对合金抗高温氧化性的影响
DOI:
作者:
作者单位:

1.重庆材料研究院;2.重庆大学

作者简介:

通讯作者:

中图分类号:

基金项目:

增材制造技术与系统高价值专利培育项目


Effect of Grain Control of Alloy on High Temperature Oxidation Resistance of Fe-Al-Cr Alloy
Author:
Affiliation:

1.Chongqing Research Institute of Materials;2.ChongQing University;3.Chongqing Materials research institude

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    Fe-Al-Cr合金具有良好的高温抗高温氧化性,有广泛的应用前景,具有晶粒粗大的特点但通常面临着晶粒粗大的问题。本文通过在Fe-Al-Cr合金中添加镍、碳、铜等奥氏体化元素,使合金在冷却过程中生成FeCr相,以阻碍晶粒长大的方式,使合金晶粒尺寸可以控制在100μm以内。研究探讨了Fe-Al-Cr合金的氧化物薄膜形成的形成机制以及晶粒控制对Fe-Al-Cr合金的抗高温氧化性的影响。通过金相显微镜观察高温下经不同氧化时间氧化后的Fe-Al-Cr合金,发现Al2O3薄膜优先形成于晶界,晶界数量增多有利于Al2O3的形成和生长。通过扫描电镜观察和能谱分析,发现在Fe-Al-Cr合金中,(Al0.9Cr0.1)2O3和Al2O3组成了多层氧化物。结合第一性原理计算,得出该多层氧化物是由于Cr的扩散而在合金表面形成的,有助于提高Fe-Al-Cr合金的抗高温氧化性。最后,证实晶粒尺寸较小的Fe-Al-Cr合金具有更好的抗高温氧化性。。

    Abstract:

    Fe-Al-Cr alloy has good resistance to high temperature oxidation and has wide application prospects, but it is usually faced with the problem of coarse grains. By adding austenitizing elements such as nickel, carbon and copper to the Fe-Al-Cr alloy, the FeCr phase is formed during the cooling process, which hinders grain growth and the grain size can be controlled within 100 μm. The formation mechanism of oxide film and the effect of grain control on the high temperature oxidation resistance of Fe Al Cr alloy were discussed. The Fe-Al-Cr alloy oxidized at different oxidation times at high temperature was observed by metallography. It was found that the alumina film was preferentially formed at the grain boundary, and the number of grain boundaries was more favorable for the formation and growth of Al2O3. Scanning electron microscopy and energy spectrum analysis revealed that (Al0.9Cr0.1)2O3 and Al2O3 formed a multilayer oxide. Combined with the first principle calculation, it is concluded that the multilayer oxide is formed on the surface of the alloy due to the diffusion of Cr, which is beneficial to improve the high temperature oxidation resistance of the Fe-Al-Cr alloy. Finally, it was confirmed that the Fe-Al-Cr alloy having a smaller grain size has better resistance to high temperature oxidation.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-09-05
  • 最后修改日期:2019-11-18
  • 录用日期:2019-11-18
  • 在线发布日期:
  • 出版日期: