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首页> 外文期刊>Materials Science and Engineering >Effect of Cr additions on a γ-γ' microstructure and creep behavior of a Co-based superalloy with low W content
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Effect of Cr additions on a γ-γ' microstructure and creep behavior of a Co-based superalloy with low W content

机译：Cr添加对低W含量Co基高温合金γ-γ'组织和蠕变行为的影响

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摘要

Nickel- and cobalt-based superalloys derive their excellent oxidation and corrosion resistance from the surface oxidation of Al and Cr, which form protective oxide layers. Starting from an existing Cr-free cobalt-based superalloy (Co-30Ni-7Al-4Ti-3Mo-2W-1Nb-1Ta-0.1B at. %) with a γ-γ' microstructure, we create three alloys with 4, 8 and 12 at. % Cr additions. Chromium lowers the γ' solvus temperature (from 1129 ℃ for 0% Cr to 1075 ℃ for 12 at. % Cr) and alters the γ' precipitate morphology (from cuboidal-to-spherical), but does not affect the coarsening kinetics (which follow the Lifshitz-Slyozov-Wagner model). The alloys with 8 and 12 at. % Cr exhibit minor amounts of a Mo-rich intermetallic phase at grain boundaries after homogenization, and the 12 at. % Cr alloy displays an additional ～3 vol % intragranular refractory-rich secondary precipitates upon aging at 850 ℃ for 168 h. Atom-probe tomography reveals that Cr partitions strongly to the γ-matrix, with a partitioning coefficient of k~(γ'/γ) = 0.33 and 0.26 for Cr additions of 4 and 8%, respectively. These additions halve the creep rate of the original alloy at stresses between 275 and 400 MPa, reflecting significant changes in γ' precipitate composition, volume fraction, morphology, and rafting tendency.
机译：镍和钴基超级合金源自形成保护性氧化层的Al和Cr的表面氧化，从而具有出色的抗氧化性和耐腐蚀性。从现有的具有γ-γ'微结构的无铬钴基高温合金（Co-30Ni-7Al-4Ti-3Mo-2W-1Nb-1Ta-0.1B at。％）开始，我们制造出三种合金，其中4、8和12 at。铬添加量。铬可以降低γ'的固溶温度（从0％Cr的1129℃到12 at。％Cr的1075℃），并改变γ'的析出形态（从长方体到球形），但不影响粗化动力学（遵循Lifshitz-Slyozov-Wagner模型）。 8和12 at。的合金％Cr在均质化后的晶界处表现出少量的富Mo金属间相，在12at处。 Cr合金在850℃时效168 h时会产生约〜3 vol％的晶内富耐火材料二次析出物。原子探针层析成像显示Cr强烈地分配到γ矩阵中，添加4和8％的Cr的分配系数分别为k〜（γ'/γ）= 0.33和0.26。这些添加使原始合金在275至400 MPa之间的应力下的蠕变速率减半，反映了γ'沉淀成分，体积分数，形态和漂流趋势的显着变化。

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  • 来源
    《Materials Science and Engineering》 |2020年第19期|139108.1-139108.10|共10页
  • 作者

    Daniel S. Ng; Ding-Wen Chung; Jacques P. Toinin; David N. Seidman; David C. Dunand; Eric A. Lass;

  • 作者单位

    Department of Materials Science and Engineering Northwestern University 2200 Campus Drive Evanston IL 60208-3108 USA;

    Department of Materials Science and Engineering Northwestern University 2200 Campus Drive Evanston IL 60208-3108 USA RWTH Aachen University Ⅰ. Institute of Physics Sommerfeldstrasse 14 52074 Aachen Germany;

    Department of Materials Science and Engineering Northwestern University 2200 Campus Drive Evanston IL 60208-3108 USA Northwestern University Center for Atom-Probe Tomography (NUCAPT) Northwestern University Evanston IL 60208-3108 USA;

    Department of Materials Science and Engineering The University of Tennessee 1508 Middle Drive Knoxville TN 37996-2100 USA Materials Science and Engineering Division National Institute of Standards and Technology 100 Bureau Drive Gaithersburg MD 20899-8555 USA;

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  • 正文语种 eng
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  • 关键词

    Superalloys; Coarsening kinetics; Atom-probe tomography; Partitioning; Creep; Rafting;

    机译：高温合金;粗化动力学;原子探针层析成像;分区;蠕变;漂流;

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