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Mo和Re对含Ru新型单晶高温合金组织稳定性的影响
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深圳市万泽中南研究院有限公司

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深圳市科技创新委员会项目(No.20150128085205453)


Effects of Mo and Re on the Microstructural Stability of the Novel Single Crystal Superalloys Containing Ru
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Shenzhen Wedge Central South Research Institude Co,Ltd

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    摘要:

    制备名义成分分别含0.4% Mo-6.4% Re、2.8% Mo-6.4% Re和0.4% Mo-6.7% Re的三种新型镍基单晶高温合金。分析合金经过热处理后的元素分配配比,经过1100 ℃,0~1000 h的热暴露后的γ′相演化、拓扑密排相(TCP)析出规律。结果表明,Re含量的微量增加和Mo含量的大幅增加会明显增加各元素在枝晶干和枝晶间、γ/γ′两相间的偏聚,低扩散元素Re等在枝晶干和γ相的偏析降低了热暴露过程中γ′相的粗化速率。Re的微量增加,促进P相析出数量增多,但P相的长大受到一定限制,原因是Re促进P相形成元素Re、W和Ru在枝晶干的偏聚,促进P相形核,使P相数量增多,但大量析出的P相互相接触交叉,反而降低了长大速率。Mo含量的大幅增加,使得在1100 ℃长时热暴露过程中同时存在μ相和P相,且μ相优先析出,数量多,尺寸大,而P相析出时间延迟,数量少,尺寸小,原因是Mo促进μ相的主要组成元素Re、W、Mo在枝晶干的偏聚,尤其是Mo含量的提高,促进μ相优先析出,随着μ相形成元素的消耗,以及P相在1100 ℃下更稳定,促使P相在μ相之后析出。

    Abstract:

    A novel nickel-based single crystal superalloys containing 0.4% Mo - 6.4% Re, 2.8% Mo - 6.4% Re and 0.4% Mo - 6.8% Re, respectively, in nominal composition was prepared. The element concentrations of alloys after SHT were measured, γ′ phase evolution and topological close-packed phase (TCP) precipitation of the alloys thermal exposed at 1100℃ up to 1 000 h were analyzed. The slight increment of Re and the increase of Mo content obviously facilitated the segregation of elements between dendrite and interdendrite, and between γ and γ′ phase. The coarsening rate of the γ′ phase during thermal exposure was reduced due to the segregation of low-diffusion elements such as Re in the dendrite core and the γ phase. The slight increase of Re promoted the precipitation of P phase but inhibited the growth rate of P phase, because the nucleation of the P phase was promoted by the segregation of the P phase forming elements Re, W and Ru in the dendrite core. However, the growth rate was inhibited because of contaction and intersection of precipitated P in large amount. The large increase of Mo content made both μ phase and P phase exist during the long-term thermal exposure at 1100 ℃. The μ phase was preferentially precipitated with a large number and a large size, while the precipitation of the P phase was delayed with smaller number and size. Mo promotes the segregation of the main constituent elements of μ phase, Re, W, and Mo in the dendrite core, especially the increase of Mo content, which promotes the preferential precipitation of μ phase. With the consumption of μ phase forming elements, and the presence of P phase is more stable at 1100 °C, P phase precipitates subsequently.

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崔金艳,张建庭,尧健,王冲,郭建政. Mo和Re对含Ru新型单晶高温合金组织稳定性的影响[J].稀有金属材料与工程,2023,52(4):1490~1498.[Cui Jinyan, Zhang Jianting, Yao Jian, Wang Chong, Guo Jianzheng. Effects of Mo and Re on the Microstructural Stability of the Novel Single Crystal Superalloys Containing Ru[J]. Rare Metal Materials and Engineering,2023,52(4):1490~1498.]
DOI:10.12442/j. issn.1002-185X.20220201

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  • 收稿日期:2022-03-14
  • 最后修改日期:2022-04-14
  • 录用日期:2022-04-26
  • 在线发布日期: 2023-05-01
  • 出版日期: 2023-04-25