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首页> 外文期刊>Materials Science and Engineering >Effects of aluminum and molybdenum content on the microstructure and properties of multi-component γ'-strengthened cobalt-base superalloys
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Effects of aluminum and molybdenum content on the microstructure and properties of multi-component γ'-strengthened cobalt-base superalloys

机译：铝和钼含量对多组分γ'增强钴基高温合金组织和性能的影响

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摘要

Five novel Co-30Ni-(6+x)Al-(3-y)W-yMo-1Ta-3.5Ti-12Cr-0.1Hf-0.025 C (x = 0, y = 0, 1, and x = 2, y = 0, 1, 2 at%) multi-component polycrystalline γ′-strengthened Co-base superalloys are designed to investigate the effects of Al and Mo content on the microstructure and properties in this study. Based on the 6Al3W alloy, the addition of 2 at% Al has the effects of increasing the γ′ solvus temperature, reducing the density, increasing the γ′ volume fraction and coarsening rate, reducing the Vickers hardness but increasing the yield strength at 750 ℃. The replacement of 1 at% W by 1 at% Mo remarkably reduced the density with a negligible effect on the γ′ coarsening rate; Meanwhile, this slightly reduced the γ′ solvus temperature and volume fraction causing a slight decrease of Vickers hardness and yield strength at 750 ℃. The experimental alloys all show relatively low density, large processing window, good microstructure stability at 750 ℃ and mechanical properties, especially for 6Al2W1Mo alloy which has density of 8.69 g cm−3, processing window of 247 ℃, room-temperature Vickers hardness of 5.1 GPa, stable microstructure without detrimental phase after a heat treatment of 900 ℃ @8 h+ 750 ℃ @1000 h. These results may provide guidance for the development of the novel wrought Co-base superalloys with high performance and low density.
机译：五种新颖的Co-30Ni-（6 + x）Al-（3-y）W-yMo-1Ta-3.5Ti-12Cr-0.1Hf-0.025 C（x = 0，y = 0，1，和x = 2，为了研究Al和Mo含量对本研究的组织和性能的影响，设计了y == 0,1,2，at％的多组分多晶γ′-强化Co基高温合金。在6Al3W合金的基础上，添加2％at％的Al具有提高γ'固溶温度，降低密度，增加γ'体积分数和粗化率，降低维氏硬度但提高750°C屈服强度的作用。 。用1％at％Mo代替1％at％W显着降低了密度，而对γ'粗化速率的影响可忽略不计。同时，这略微降低了γ'固溶线的温度和体积分数，导致750℃下的维氏硬度和屈服强度略有下降。所有实验合金均显示出相对较低的密度，较大的加工窗口，在750℃下具有良好的组织稳定性和力学性能，特别是对于密度为8.69 g cm-3，加工窗口为247，室温维氏硬度为5.1的6Al2W1Mo合金而言GPa，经过900℃@ 8 h + 750℃@ 1000 h热处理后，组织稳定，没有有害相。这些结果可为高性能，低密度的新型锻造钴基高温合金的开发提供指导。

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  • 来源
    《Materials Science and Engineering》 |2018年第8期|265-273|共9页
  • 作者

    Yi Zhang; Huadong Fu; Xiaozhou Zhou; Yuheng Zhang; Jianxin Xie;

  • 作者单位

    Beijing Advanced Innovation Center of Materials Genome Engineering, University of Science and Technology Beijing,Key Laboratory for Advanced Materials Processing of Ministry of Education, Institute for Advanced Materials and Technology, University of Science and Technology Beijing;

    Beijing Advanced Innovation Center of Materials Genome Engineering, University of Science and Technology Beijing,Key Laboratory for Advanced Materials Processing of Ministry of Education, Institute for Advanced Materials and Technology, University of Science and Technology Beijing;

    Beijing Advanced Innovation Center of Materials Genome Engineering, University of Science and Technology Beijing,Key Laboratory for Advanced Materials Processing of Ministry of Education, Institute for Advanced Materials and Technology, University of Science and Technology Beijing;

    Beijing Advanced Innovation Center of Materials Genome Engineering, University of Science and Technology Beijing,Key Laboratory for Advanced Materials Processing of Ministry of Education, Institute for Advanced Materials and Technology, University of Science and Technology Beijing;

    Beijing Advanced Innovation Center of Materials Genome Engineering, University of Science and Technology Beijing,Key Laboratory for Advanced Materials Processing of Ministry of Education, Institute for Advanced Materials and Technology, University of Science and Technology Beijing;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cobalt-base superalloys; Microstructure stability; Density; Mechanical properties;

    机译：钴基高温合金显微组织稳定性密度力学性能;

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