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Ta、Co對新型高強抗熱腐蝕單晶高溫合金組織穩(wěn)定性的影響
作者:
作者單位:

1.中國科學(xué)院金屬研究所;2.中國機械總院集團沈陽鑄造研究所有限公司

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中圖分類號:

TG132.3+2

基金項目:

國家重點研發(fā)計劃(2021YFC2202402)；遼寧省科技攻關(guān)計劃課題(2019JH2/10100009)


Effects of Ta and Co on Microstructural Stability of a Novel High Strength and Hot Corrosion Resistant Single Crystal Superalloys
Author:
Affiliation:

1.Institute of Metal Research,Chinese Academy of Sciences;2.Shenyang Research Institute of Foundry Co,Ltd CAM

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    摘要:

    研究了Ta、Co對一種新型高強抗熱腐蝕單晶高溫合金微觀組織及1000 ℃長期時效中組織穩(wěn)定性的影響。結(jié)果表明，隨Ta含量的增加，γ′相溶解溫度提高，完全熱處理后的γ′相尺寸先增大后減小，Co降低了γ′相溶解溫度，減小了γ′相尺寸并且降低了γ′相的含量；1000 ℃長期時效過程中，隨Ta含量的提高，γ′相粗化速率先降低后升高，Co降低了γ′相的粗化速率，γ/γ′兩相錯配度和元素的擴散是影響γ′相粗化速率的主要因素；Ta提高了合金中γ′相的含量，促使Re、W、Mo、Cr元素向γ基體中分配，促進了TCP相的析出，Co降低了Re、W、Mo、Cr元素在γ基體中的分配，降低了基體的過飽和度，抑制了TCP相的析出。

    Abstract:

    The microstructure of hot-corrosion resistant single crystal superalloy with different Ta and Co contents and the microstructure stability during long-term aging at 1000 ℃ was investigated. The results show that in the single crystal superalloy of the experiment, the dissolution temperature of γ" phase increases with the increase of Ta content, the size of γ" phase first increases and then decreases after complete heat treatment. The dissolution temperature of γ" phase decreases and the size of γ" phase and the content of γ" phase reduces with the increase of Co content. During the long-term aging process at 1000 ℃, the coarsening rate of γ" phase first decreases and then increases with the increase of Ta content, while the coarsening rate of γ" phase decreases with the increase of Co content. The mismatch degree of γ/γ" phase and the diffusion of elements in matrix are the main factors affecting the coarsening rate of γ" phase in the four alloys. In addition, Ta increases the content of γ" phase, promotes the distribution of Re, W, Mo and Cr in γ matrix, and promotes the precipitation of TCP phase, while Co reduces the distribution of Re, W, Mo and Cr in γ matrix, reduces the supersaturation of matrix and inhibits the precipitation of TCP phase.

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來永軍,寧禮奎,趙嶺,柳一川,劉恩澤,譚政,李海英,佟健,鄭志. Ta、Co對新型高強抗熱腐蝕單晶高溫合金組織穩(wěn)定性的影響[J].稀有金屬材料與工程,2024,53(3):748~756.[Lai Yongjun, Ning Likui, Zhao Ling, Liu Yichuan, Liu Enze, Tan Zheng, Li Haiying, Tong Jian, Zheng Zhi. Effects of Ta and Co on Microstructural Stability of a Novel High Strength and Hot Corrosion Resistant Single Crystal Superalloys[J]. Rare Metal Materials and Engineering,2024,53(3):748~756.]
DOI：10.12442/j. issn.1002-185X.20230115

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  • 收稿日期:2023-03-06
  • 最后修改日期:2023-05-03
  • 錄用日期:2023-05-15
  • 在線發(fā)布日期: 2024-03-27
  • 出版日期: 2024-03-20