摘要
目前有关FeCrAl-ODS钢在高温水蒸汽下的氧化过程中氧化膜结构的演变少有分析研究。以FeCrAl-ODS合金为研究对象,采用XRD、SEM、EPMA、EDS等分析手段,在700~1100℃条件下开展了高温水蒸气氧化试验,从氧化动力学和氧化层结构形貌、物相、成分等方面研究了其高温水蒸气氧化行为。研究结果表明:在700~1100℃,FeCrAl-ODS合金高温水蒸气氧化动力学满足抛物线增重规律,抛物线速率常数Kp随温度增加而增大。高温水蒸气氧化96 h后,700℃时FeCrAl-ODS合金表面氧化层以Fe_(2)O_(3)为主;900℃时FeCrAl-ODS合金表面氧化层的外层以Fe_(2)O_(3)为主,内层以Al2O3为主,氧化层比较疏松,不能很好地对基体起到保护作用;1100℃氧化过程中,在不同氧化时间段氧化层均为单层致密的Al2O3氧化层结构。
At present,the evolution of oxide film structure of FeCrAl-ODS steel in the process of oxidation under high temperature steam is rarely studied.Taking FeCrAl-ODS alloy as the research object,using XRD,SEM,EPMA and EDS analysis methods,the high temperature steam oxidation experiment was carried out at 700~1100℃.The oxidation behavior of steam at high temperature was studied according to the oxidation kinetics and the structure morphology,phase and composition of the oxide layer.Results showed that the kinetics of high temperature steam oxidation of FeCrAl-ODS alloy met the parabolic law of weight gain at 700~1100℃,and the parabolic rate constant Kp increased with the increase of temperature.After 96 h of high temperature steam oxidation,Fe_(2)O_(3) was the main oxide layer on FeCrAl-ODS alloy surface at 700℃.At 900℃,Fe_(2)O_(3) dominated outer layer and Al2O3 dominated inner layer of FeCrAl-ODS alloy surface oxide layer,and the loose oxide layer could not protect the substrate well.In the process of oxidation at 1100℃,the oxide layer at different oxidation time was a monolayer of dense Al2O3 oxide layer structure.
作者
龙弟均
李青
宋鹏
孙永铎
张瑞谦
邱绍宇
LONG Di-jun;LI Qing;SONG Peng;SUN Yong-duo;ZHANG Rui-qian;QIU Shao-yu(Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610213,China;Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《材料保护》
CAS
CSCD
2021年第5期157-163,共7页
Materials Protection
基金
中国核工业集团公司青年人才科研计划(NPIC-K301007003)
国家自然科学基金(U1867201)资助。
