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Strength prediction of Ni-base disc superalloys: Modified γ' hardening models applicable to commercial alloys

机译：Ni-Base Disc超合金的强度预测：适用于商业合金的改性γ'硬化模型

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摘要

The reported strength predictions of γ' hardening so far for polycrystalline Ni-base superalloys tend to be underestimated. This is mostly due to the difficulty in isolating the γ' hardening amidst the complicated multilevel strengthening mechanisms of the alloy and negligence of the contribution from γ/γ' mixture strength. For these reasons, a series of single-crystal tie-line model alloys with specially designed γ' size and volume fractions was adopted in this work, allowing a direct validation of classical γ' particle hardening equations for the first time. Using the iso-work assumption, γ' particle strengthening and γ/γ' mixture strength at 650 °C were individually extracted from the compression test results. It was found that the classical strengthening models were unable to predict the expected strength increment with increasing γ' volume fractions. Modified versions of the classical equations were proposed, which gave improved predictability across wider γ' volume fractions and served as important basis for strength design application.
机译：到目前为止，γ'硬化的报告的强度预测倾向于低估了多晶的Ni碱基超合金。这主要是由于难以将γ'硬化隔离，在合金的复杂多级强化机制和γ/γ'混合强度的贡献的贡献中的复杂的多级强化机制中。由于这些原因，在这项工作中采用了一系列具有特殊设计的γ'尺寸和体积级分的单晶系列模型合金，首次允许直接验证经典γ'颗粒硬化方程。使用ISO工作假设，从压缩试验结果单独提取650℃的γ'颗粒强化和γ/γ'的混合强度。发现经典强化模型无法预测增加γ'体积分数的预期强度增量。提出了经典方程的修改版本，其在更广泛的γ'体积分数上提高了可预测性，并为强度设计应用提供了重要的基础。

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  • 来源
    《Materials Science and Engineering》 |2021年第2期|140103.1-140103.8|共8页
  • 作者

    L. Wu; T. Osada; I. Watanabe; T. Yokokawa; T. Kobayashi; K. Kawagishi;

  • 作者单位

    National Institute for Materials Science NIMS 1-2-1 Sengen Tsukuba Ibaraki 305-004 Japan;

    National Institute for Materials Science NIMS 1-2-1 Sengen Tsukuba Ibaraki 305-004 Japan;

    National Institute for Materials Science NIMS 1-2-1 Sengen Tsukuba Ibaraki 305-004 Japan;

    National Institute for Materials Science NIMS 1-2-1 Sengen Tsukuba Ibaraki 305-004 Japan;

    National Institute for Materials Science NIMS 1-2-1 Sengen Tsukuba Ibaraki 305-004 Japan;

    National Institute for Materials Science NIMS 1-2-1 Sengen Tsukuba Ibaraki 305-004 Japan;

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  • 正文语种 eng
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  • 关键词

    Ni-base superalloys; γ/γ'; Heat-treatments; Strength; Precipitation; Deformation;

    机译：Ni-Base超级合金;γ/γ';热处理;力量;沉淀;形变;

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