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激光沖擊強(qiáng)化鎳基單晶高溫合金的電化學(xué)腐蝕行為
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作者單位:

1.南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室;2.南昌航空大學(xué) 材料科學(xué)與工程學(xué)院

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中圖分類(lèi)號(hào):

TG668

基金項(xiàng)目:

Youth Science Fund project of Jiangxi Province (No. 20212BAB214037), National Natural Science Foundation of China (Nos. 52271057, 52071172, 51361026), the Open Foundation of National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology (No. EG202101419), and the PhD Research Startup Foundation of Nanchang Hangkong University (No.EA202001199).


Electrochemical Corrosion Behavior of Ni-based Single-Crystal Superalloy Treated by Laser Shock Peening
Author:
Affiliation:

1.National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China;2.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

Fund Project:

Youth Science Fund Project of Jiangxi Province (20212BAB214037); National Natural Science Foundation of China (52271057, 52071172, 51361026); Open Foundation of National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology (EG202101419); PhD Research Startup Foundation of Nanchang Hangkong University (EA202001199)

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    摘要:

    采用激光沖擊強(qiáng)化技術(shù)處理了鎳基單晶高溫合金，隨后分別熱暴露于750和850 ℃下2 h，研究了其在3.5% NaCl溶液中的電化學(xué)腐蝕行為。結(jié)果表明，激光沖擊強(qiáng)化處理增加了鎳基單晶合金的耐蝕性，這與其誘導(dǎo)的殘余壓應(yīng)力和γ/γ′兩相中的位錯(cuò)結(jié)構(gòu)有關(guān)。γ/γ′兩相中非均勻分布的位錯(cuò)增加了兩相錯(cuò)配度。熱暴露后激光沖擊強(qiáng)化試樣電化學(xué)腐蝕試驗(yàn)表明，殘余壓應(yīng)力和兩相錯(cuò)配度是影響單晶合金耐蝕性的2個(gè)主要因素。殘余壓應(yīng)力可以提高單晶合金的耐蝕性，而兩相錯(cuò)配度則降低了單晶合金的耐蝕性。此外，單晶合金耐蝕性的提高也與Ta2O5和WO3氧化物的形成有關(guān)。

    Abstract:

    Ni-based single-crystal (SC) superalloys were treated by laser shock peening (LSP) and then exposed at 750 and 850 °C for 2 h. The electrochemical corrosion behavior of the as-obtained specimens was investigated in 3.5wt% NaCl solution. The results show an increase in the corrosion resistance of SC alloy treated by LSP; it is related to the compressive residual stresses (CRS) and significantly different dislocation structures in γ/γ′ phases. The non-uniformly distributed dislocations in γ/γ′ phases raise the two-phase misfit. The electrochemical corrosion tests of LSP-treated specimens after heat exposure indicate that CRS and two-phase misfit are the two major factors influencing the corrosion resistance of SC alloys. CRS can enhance the corrosion resistance while the two-phase misfit deteriorates the corrosion resistance of SC alloys. In addition, the improved corrosion resistance of SC superalloys is linked to the formation of Ta2O5 and WO3 oxides.

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引用本文

耿永祥,鄭海忠,李貴發(fā),肖怡新.激光沖擊強(qiáng)化鎳基單晶高溫合金的電化學(xué)腐蝕行為[J].稀有金屬材料與工程,2023,52(8):2721~2731.[Geng Yongxiang, Zheng Haizhong, Li Guifa, Xiao Yixin. Electrochemical Corrosion Behavior of Ni-based Single-Crystal Superalloy Treated by Laser Shock Peening[J]. Rare Metal Materials and Engineering,2023,52(8):2721~2731.]
DOI：10.12442/j. issn.1002-185X.20220921

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歷史
  • 收稿日期:2022-11-27
  • 最后修改日期:2023-05-23
  • 錄用日期:2023-02-14
  • 在線發(fā)布日期: 2023-08-25
  • 出版日期: 2023-08-24