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镧和铈对Fe25Cr5Al合金高温氧化行为的影响
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1.江苏大学 材料科学与工程学院,江苏 镇江 212000;2.钢铁研究总院淮安有限公司,江苏 淮安 223000

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Key R&D Program of Jiangsu Province (BE2018097)


Effect of La and Ce on High Temperature Oxidation Behavior of Fe25Cr5Al Alloys
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1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212000, China;2.Huaian CIRSI Co., Ltd, Huaian 223000, China

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Key Research and Development Program of Jiangsu Province (BE2018097)

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    摘要:

    含稀土元素La、Ce的Fe25Cr5Al-RE合金和不含稀土的Fe25Cr5Al合金在1100 ℃的空气中进行了恒温氧化实验。采用扫描电子显微镜(SEM)观察氧化膜形貌,使用X射线衍射仪(XRD)结合能谱仪(EDS)分析氧化膜成分。结果表明,氧化1、20和300 h后,Fe25Cr5Al合金增重分别为0.08、0.84和4.41 mg·cm-2,Fe25Cr5Al-RE合金增重分别为0.03、0.35和0.92 mg·cm-2。氧化后所有合金的氧化膜成分均为α-Al2O3。La、Ce能够促进合金形成致密、连续的氧化膜,显著提高了Fe25Cr5Al合金的抗高温氧化性能。此外,Fe25Cr5Al-RE合金氧化膜/基体界面存在稀土氧化物钉,使得氧化膜与基体的结合更加紧密,增强了氧化膜/基体粘附性。Fe25Cr5Al-RE合金氧化后,氧化膜内存在稀土氧化物,有效地防止了合金发生进一步氧化。

    Abstract:

    Fe25Cr5Al alloys with and without rare earth (RE) elements La and Ce, namely Fe25Cr5Al-RE and Fe25Cr5Al alloys, were prepared and isothermal oxidation tests were conducted at 1100 °C. The morphology of oxide scale was observed by scanning electron microscope (SEM), and the oxidation product was identified by energy disperse spectroscopy (EDS) coupled with X-ray diffraction (XRD). Results show that after oxidation for 1, 20, and 300 h, the mass gain of Fe25Cr5Al alloys is 0.08, 0.84, and 4.41 mg·cm-2, but that of Fe25Cr5Al-RE alloys is 0.03, 0.35, and 0.92 mg·cm-2, respectively. The oxide scale of the two alloys consists of α-Al2O3. La and Ce promote the formation of compact and continuous oxide scale, which significantly improves the high temperature oxidation resistance of Fe25Cr5Al alloys. Moreover, RE oxide pegs can be observed at substrate/scale interface of Fe25Cr5Al-RE alloys, which makes the bond between substrate and scale tighter, thus enhancing the adhesion of the interface. There are RE oxides in oxide scale of Fe25Cr5Al-RE alloys, which effectively inhibits further oxidation of the alloys.

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吴晓东,王联进,王忠英,陈雪琴,王双.镧和铈对Fe25Cr5Al合金高温氧化行为的影响[J].稀有金属材料与工程,2021,50(11):3837~3844.[Wu Xiaodong, Wang Lianjin, Wang Zhongying, Chen Xueqin, Wang Shuang. Effect of La and Ce on High Temperature Oxidation Behavior of Fe25Cr5Al Alloys[J]. Rare Metal Materials and Engineering,2021,50(11):3837~3844.]
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历史
  • 收稿日期:2020-09-08
  • 最后修改日期:2020-12-06
  • 录用日期:2020-12-22
  • 在线发布日期: 2021-11-25
  • 出版日期: 2021-11-24