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B對(duì)一種高Al+Ti鎳基高溫合金氧化行為的影響
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1.遼寧科技大學(xué);2.中國(guó)科學(xué)院金屬研究所

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)U1560203)


Effect of B on the high temperature oxidation behavior of a nickel-base superalloy with high Al and Ti contents
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1.University of Science and Technology Liaoning;2.Institute of Metal Research,Chinese Academy of Sciences

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    摘要:

    采用真空感應(yīng)爐制備了不同B含量的U720Li合金鑄錠并對(duì)其進(jìn)行了均勻化處理，研究了B對(duì)均勻化態(tài)U720Li合金1100 ℃恒溫氧化行為的影響。結(jié)果表明，經(jīng)高溫均勻化處理后不同B含量合金基體中的B均發(fā)生了嚴(yán)重?fù)p耗，表明在1100 ℃以上空氣中熱暴露時(shí)B會(huì)向氧化皮中迅速擴(kuò)散；增加B含量降低了合金的氧化速率，減小了氧化膜附近基體中孔洞的體積分?jǐn)?shù)及γ′分解區(qū)的厚度；高B和低B合金的氧化膜均分為3層：最外層主要由疏松的(Ni/Co)O、TiO2和復(fù)雜尖晶石化合物構(gòu)成，中間層主要為Cr2O3，最內(nèi)層是不連續(xù)的Al2O3+TiO2層。B提高均勻化態(tài)U720Li合金抗氧化性的主要原因是，增加B含量顯著增加了Cr2O3層的厚度并改善其連續(xù)性，使其具有更強(qiáng)的保護(hù)性。

    Abstract:

    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.

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趙廣迪,臧喜民,李萬(wàn)明,薛超超. B對(duì)一種高Al+Ti鎳基高溫合金氧化行為的影響[J].稀有金屬材料與工程,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.]
DOI：10.12442/j. issn.1002-185X.20190394

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  • 收稿日期:2019-05-09
  • 最后修改日期:2019-05-21
  • 錄用日期:2019-06-14
  • 在線(xiàn)發(fā)布日期: 2020-07-09
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