FeCrAl铁素体不锈钢高温氧化行为
High temperature oxidation behavior of FeCrAl ferritic stainless steel
邱国兴 1李嘉宁 1李琦 1白冲 1杨永坤 1李小明1
作者信息
- 1. 西安建筑科技大学冶金工程学院,陕西西安 710055
- 折叠
摘要
通过等温氧化试验,在大气环境下,对两种铁素体耐热不锈钢(C1不含Zr,C2含Zr)在1 000、1 050和1 100 ℃下的100 h高温氧化行为进行研究.利用X射线衍射仪、扫描电子显微镜和能谱仪对两组不锈钢氧化层表面、截面形貌和物相组成进行观察分析.试验结果表明,两种合金的高温氧化动力学曲线均遵循抛物线规律.与C1合金相比,C2合金在各温度氧化时,均表现出较低的增重率.Zr的加入没有改变氧化膜的构成,两组合金氧化膜均由内层的Cr2O3和表层富含Fe-Cr-Al-O的尖晶石氧化物组成.C1合金在不同温度氧化过程中均出现了氧化膜脱落,其中在1 100 ℃下尤为显著;C2合金表面氧化膜致密且连续,表现出良好的抗高温氧化性能.在合金中添加Zr可以增强氧化层和基体附着力,从而提高FeCrAl合金抗高温氧化性能.
Abstract
The high-temperature oxidation behavior of two ferritic heat-resistant stainless steels(C1 without Zr and C2 with Zr)was studied through isothermal oxidation tests in an atmospheric environment at 1 000,1 050,and 1 100 ℃ for 100 h.The surface,cross-sectional morphology,and phase composition of the oxidation layers of both steels were analyzed using X-ray diffraction,scanning electron microscopy,and energy dispersive spectroscopy.The experimental results indicate that the high-temperature oxidation kinetics curves of both alloys follow a parabolic law.Compared to the C1 alloy,the C2 alloy exhibited lower weight gain rates at all tested temperatures.The addi-tion of Zr did not alter the composition of the oxide film;both alloys formed oxide layers consisting of an inner Cr2O3 layer and an outer spinel oxide layer rich in Fe-Cr-Al-O.The C1 alloy experienced oxide film spallation at va-rious temperatures,with the most significant spallation observed at 1100 ℃.In contrast,the oxide film on the C2 alloy was dense and continuous,demonstrating excellent high-temperature oxidation resistance.The incorporation of Zr in the alloy enhances the adhesion between the oxide layer and the substrate,thereby improving the high-temper-ature oxidation resistance of FeCrAl·alloys.
关键词
铁素体不锈钢/Zr/高温氧化/氧化动力学/氧化膜Key words
ferritic stainless steel/Zr/high-temperature oxidation/oxidation kinetics/oxide film引用本文复制引用
基金项目
中国博士后科学基金资助项目(2022M720982)
出版年
2024
NETL
NSTL
万方数据