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Effects of composite scale on high temperature oxidation resistance of Fe-Cr-Ni heat resistant alloy

China Foundry 2009年第2期6卷 109-114页

作者： Wang Haitao Wang Yuqing Yu Huashun Min Guanghui Wang Zhifu Key Laboratory for Liquid Structure and Heredity of Materials of Education Ministry School of Materials Science and Engineering Shandong University Jinan 250061 China Jinan Railway Institute of Technology Jinan 250013 China

Fe-Cr-Ni heat resistant alloys with aluminum and silicon addition, alone and in combination, were melted using an intermediate frequency induction furnace with a non-oxidation method. By the oxidation weight gain method, the oxidation resistances of the test alloys were determined at 1,200 ℃ for 500 hours. According to the oxidation weight gains, the oxidation kinetic curves were plotted and the functions were regressed by the least squares method. The results show that the oxidation kinetic curves follow the power function of y = ax^b （a〉0, 0〈b〈1）. The effects of scale compositions on oxidation resistance were studied further by analyses using X-ray diffraction （XRD） and scanning electron microscope （SEM）. It is found that the composite scale compounds of Cr203, a-Al2O3, SiO2 and FeCr2O4, with compact structure and tiny grains, shows complete oxidation resistance at 1,200℃. When the composite scale lacks a-Al2O3 or SiO2, it becomes weak in oxidation resistance with a loose structure. By the criterion of standard Gibbs formation free energy, the model of the nucleation and growth of the composite scale is established. The forming of the composite scale is the result of the competition of being oxidized and reduced between aluminum, silicon and the matrix metal elements of iron, chromium and nickel. The protection of the composite scale is analyzed essentially by electrical conductivity and strength properties.

关键词： Fe-based alloy heat resistant alloy oxide scale oxidation resistance

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THERMAL ANALYSIS STUDY OF Fe-Cr-Mn heat resistant alloy

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Acta Metallurgica Sinica(English Letters) 1992年第9期5卷 169-172页

作者： LIANG Gongying XING Jiandong Xi’an Jiaotong University,Xi’an,China Lecturer,Department of Mechanical Engineeing,Xi’an Jiaotong University,Xi’an 710049,China

Thermal analysis has been adopted to determine the liquidus and eutectic temperature of Fe-20%Cr-Mn alloy over range of Mn and C *** regression analysis,the par- tial quasi-binary phase diagrams of Fe-Mn alloy(solidif... 详细信息

关键词： thermal analysis heat resistant alloy Fe-Cr-Mn alloy

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Effect of Cu Content on Aging Precipitation Behaviors of Cu-Rich Phase in Fe-Cr-Ni alloy

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Journal of Iron and Steel Research International 2010年第5期17卷 63-68页

作者： TAN Shu-ping WANG Zhen-hua CHENG Shi-chang LIU Zheng-dong HAN Jie-cai FU Wan-tang School of Astronautics Harbin Institute of Technology Harbin 150001 Heilongjiang China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 Hebei China Central Iron and Steel Research Institute Beijing 100081 China

The precipitation characteristics and effect on strengthening mechanism of Cu-rich phases during short-time and long-time aging for Super 304H steels with different Cu content were investigated using X-ray diffraction （XRD）, scanning electron microscope （SEM） and transmission electron microscope （TEM）. The results show that the size of Cu-rich phase particles increases, the interspace of Cu-rich phase particles decreases and the density of Curich phases increases with the increase of Cu content during short-time aging （approximately 800 h） at 650℃ for Super 304H steels. During long-time aging （more than 2 000 h） at 650 ℃, Cu-rich phase precipitates sufficiently and the strengthening effect of Cu-rich phase is preferable in Super 304H steel containing Cu of 4%. The strengthening effect of Cu-rich phase in Super 304H steels containing Cu of 2.2% or 5% is weaker than that with Cu of 4% during long-time aging （more than 2 000 h）.

关键词： heat resistant alloy Cu content Cu-rich phase aging precipitation strengthening

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The Fabrication Method and Tribological Properties of Co-TiC Sintered High-Temperature alloy

The Fabrication Method and Tribological Properties of Co-TiC...

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作者： Oleksandr Tisov Alina Yurchuk Magda Wlaz?o-?wiklińska School of Aerospace Engineering Xi'an Jiaotong University

Turbine blades of aircraft gas-turbine engines were always the place to apply novel materials and *** attention was paid to strength,corrosion-oxidation,and tribological *** blade top-shrouds are one of the most vulnerable places from the point of wear *** problem was usually solved by applying coatings(weld-deposition,electrospark coating,gas-spray coatings).The new method proposed here is to use soldering technology:the to-size plate manufactured of wear-resistant material is bonded to the friction surface by the solder with the composition close to the composition of the turbine *** this work,we propose the method and the material for improving the wear resistance of the turbine blade’s top *** cobalt-based materials(Co-15Cr-2.5Fe-2.5Al-36TiC) seem very promising for *** the present work,the manufacturing technology of the alloy by HIP method,microstructure,and high-temperature fretting-wear characteristics(1050℃) are discussed.

关键词： heat resistant alloy High-Temperature Fretting Wear Hot Isostatic Pressing Turbine Blades

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