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FexCr5Al合金在模擬失水事故下的氧化行為研究
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作者單位:

1.上海大學(xué) 材料研究所 上海;2.上海大學(xué) 微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室 上海

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基金項(xiàng)目:

國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）


Oxidation Characteristics of FexCr5Al alloys under simulated loss of coolant accident condition
Author:
Affiliation:

1.Institute of Materials, Shanghai University;2.Laboratory for Microstructures, Shanghai University

Fund Project:

The National Key Technologies R&D Program of China

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    摘要:

    本文熔煉制備了4種FexCr5Al (x=13、15、17、18,質(zhì)量分?jǐn)?shù),wt%)合金,采用有蒸汽發(fā)生器的熱重分析儀研究4種合金在1000和1200 ℃蒸汽中氧化2 h的行為。采用XRD、FIB/SEM、EDS和TEM觀察分析腐蝕后樣品的顯微組織、晶體結(jié)構(gòu)和成分。結(jié)果表明,4種合金在兩種溫度下氧化時(shí),氧化動(dòng)力學(xué)曲線均遵循拋物線規(guī)律,增加Cr含量合金的拋物線速率常數(shù)降低,改善了合金的抗高溫蒸汽氧化性能；4種合金的氧化膜均為脊?fàn)钚蚊?主要由α-Al2O3組成。隨Cr含量的增加,氧化膜中的孔隙減少,氧化膜與基體的結(jié)合性變好,說明增加Cr 含量可以提高氧化膜的致密性和結(jié)合力,有助于形成均勻且致密的Al氧化膜,從而提高合金的抗高溫蒸汽氧化性能。

    Abstract:

    In this paper, FexCr5Al (x=13, 15, 17, 18, wt%) alloys were prepared and exposed to 1000 and 1200 ℃ steam for 2 h. The high temperature oxidation behaviors of the alloys were studied by a simultaneous thermal analyzer. The microstructure and composition of the oxide film after oxidation were analyzed using XRD, FIB, EDS, and TEM. It was found that the oxidation kinetics of the alloys at two temperatures followed a parabolic growth law. The parabolic rate constants of the alloys were decreased with an increase in Cr content, and the high temperature steam oxidation resistance of the alloys were improved. The ridged oxide films mainly composed of a-Al2O3 were observed in the four alloys. In comparison with the low Cr alloy, the pores of the oxide film were reduced, and the bonding force of the oxide/matrix interface was improved in the high Cr alloy. Consequently, the compactness and adhesion of the oxide film were improved by increasing the Cr content, which promote the formation of a dense Al oxide film and enhance the high temperature steam oxidation resistance of the alloy.

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引用本文

張文懷,姚美意,林曉冬,王皓瑜,梁 雪,李毅豐,胡麗娟,謝耀平. FexCr5Al合金在模擬失水事故下的氧化行為研究[J].稀有金屬材料與工程,2024,53(8):2331~2342.[Zhang Wenhuai, Yao Meiyi, Lin Xiaodong, Wang haoyu, Liang Xue, Li Yifeng, Hulijuan, Xie yaoping. Oxidation Characteristics of FexCr5Al alloys under simulated loss of coolant accident condition[J]. Rare Metal Materials and Engineering,2024,53(8):2331~2342.]
DOI：10.12442/j. issn.1002-185X.20230442

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  • 收稿日期:2023-07-17
  • 最后修改日期:2024-01-29
  • 錄用日期:2024-02-28
  • 在線發(fā)布日期: 2024-08-20
  • 出版日期: 2024-08-08