赵广迪,臧喜民,李万明,薛超超.B对一种高Al+Ti镍基高温合金氧化行为的影响[J].稀有金属材料与工程,2020,49(6):2109~2117.[Zhao Guangdi,Zang Ximin,Li Wanming,Xue Chaochao.Effect of B on the high temperature oxidation behavior of a nickel-base superalloy with high Al and Ti contents[J].Rare Metal Materials and Engineering,2020,49(6):2109~2117.]
B对一种高Al+Ti镍基高温合金氧化行为的影响
投稿时间:2019-05-09  修订日期:2019-05-21
中文关键词:  镍基高温合金  氧化行为  
基金项目:国家自然科学基金资助(项目号U1560203)
中文摘要:
      采用真空感应炉制备了不同B含量的U720Li合金铸锭并对其进行了均匀化处理,研究了B对均匀化态U720Li合金1100 ℃恒温氧化行为的影响。结果表明,经高温均匀化处理后不同B含量合金基体中的B均发生了严重损耗,表明在1100 ℃以上空气中热暴露时B会向氧化皮中迅速扩散;增加B含量降低了合金的氧化速率,减小了氧化膜附近基体中孔洞的体积分数及γ′分解区的厚度;高B和低B合金的氧化膜均分为3层:最外层主要由疏松的(Ni/Co)O、TiO2和复杂尖晶石化合物构成,中间层主要为Cr2O3,最内层是不连续的Al2O3+TiO2层。B提高均匀化态U720Li合金抗氧化性的主要原因是,增加B含量显著增加了Cr2O3层的厚度并改善其连续性,使其具有更强的保护性。
Effect of B on the high temperature oxidation behavior of a nickel-base superalloy with high Al and Ti contents
英文关键词:Nickel-base superalloy  oxidation  boron
英文摘要:
      Three U720Li ingots with different B contents were produced by vacuum induction melting and afterwards they were fully homogenized. The effect of B on the isothermal oxidation behavior of as-homogenized U720Li alloy at 1100 ℃ was investigated by a discontinuous increasing weight method. After the homogenization treatment, extremely serious B depletion from the alloy matrix was found by ICP-AES, indicating that B could diffuse rapidly towards the oxide scale during high temperature air exposure (above 1100 ℃). The B addition decreased the oxidation rate and reduced the volume fraction of pores and the thickness of γ′ depleted layer. The scales formed on both low B and high B alloys consist of three layers, loose outer layer composed of (Ni/Co)O, TiO2 and complex spinel, compact intermediate layer is mainly Cr2O3 and discrete internal oxides are Al2O3+TiO2. It is deemed that B improves the oxidation resistance mainly by promoting the formation of a more continuous and protective Cr2O3 intermediate layer.
作者单位E-mail
赵广迪 辽宁科技大学 gdzhao12s@alum.imr.ac.cn 
臧喜民 辽宁科技大学  
李万明 辽宁科技大学  
薛超超 中国科学院金属研究所  
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