摘要
以Fe-18Cr-30Ni为基础,添加不同含量的Al设计了4组新型奥氏体耐热钢。利用氧化质量增加法研究了4组新型奥氏体耐热钢在700、800和900℃下空气中的氧化行为,绘制了氧化动力学质量增加曲线,并利用XRD、SEM和EDS对氧化膜的表面形貌及结构进行了表征。结果表明,1~3号钢在900℃时均形成了较为致密的Al2O3内层氧化膜,合金表面生成的复合氧化膜由内到外依次为Al_2O_3、（Al_（0.9）Cr_（0.1））_2O_3、尖晶石氧化物Fe（Cr,Al）_2O_4;1号钢氧化过程中还形成了富（Cr,Fe）的混合氧化物,降低了Al_2O_3氧化膜的连续性;4号钢900℃并没有形成致密的Al_2O_3内层氧化膜,生成的复合氧化膜由内到外依次为（Al_（0.9）Cr_（0.1））_2O_3、尖晶石氧化物Fe（Cr,Al）_2O_4。
Four groups of austenitic heat resisting steel based on Fe-18Cr-30 Ni were designed by adding Al with different content.The high temperature oxidation properties of the four tested steels oxidized at 700,800 and 900 ℃ were investigated by means of oxidation mass gain method,and the high temperature oxidation kinetics mass gain curves were obtained.Surface morphologies and structure of the oxidation films were investigated by using scanning electron microscopy（SEM）,energy dispersive spectrometer（EDS） and X-ray diffraction（XRD）meter.The results show that a relatively compact internal oxidation film of Al_2O_3 is formed on the No.1 to No.3 steels at 900 ℃,and the oxidation films on these steels are composed of Al_2O_3,（Al_（0.）9Cr_（0.1））_2O_3and spinel oxides Fe（Cr,Al）_2O_4from interior to exterior,however,a Fe-Cr-riched external oxide scale is formed on the No.1 steel which destroys the continuity of Al2O3 oxidation film.There is no compact internal oxidation film of Al_2O_3 formed on the No.4 steel when oxidized at 900 ℃ and its oxidation film consists of（Al_（0.9）Cr_（0.1））_2O_3and spinel oxides Fe（Cr,Al）_2O_4from interior to exterior.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第8期1-5,共5页
Heat Treatment of Metals
基金
国家高技术研究发展计划(863计划)(2012AA03A501)
关键词
耐热钢
铝
氧化动力学
高温抗氧化性
氧化膜
heat resisting steel
aluminum
oxidation kinetics
high temperature oxidation resistance
oxide film
