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首页> 外文期刊>Materials Science and Engineering >Effect of heat treatment on the microstructure, texture and elastic anisotropy of the nickel-based superalloy CM247LC processed by selective laser melting
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Effect of heat treatment on the microstructure, texture and elastic anisotropy of the nickel-based superalloy CM247LC processed by selective laser melting

机译：热处理对选择性激光熔炼镍基高温合金CM247LC的组织，织构和弹性各向异性的影响

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摘要

Selective laser melting (SLM) of nickel-based superalloys is of great interest for the aerospace industry due to its capability for producing components with complex geometries. However, an improved understanding of the effect of SLM and subsequent post deposition heat treatments on the microstructure and mechanical properties is required to ensure that components with good structural integrity are produced. In this study, the microstructure, texture and elastic anisotropy of the nickel-based superalloy, CM247LC, in the as-SLM and heat-treated states have been analysed. The as-SLM microstructure showed fine elongated cells with a preferential alignment of < 001 > along the build direction and a significant intercellular misorientation. Heat treatments at temperatures below 1230 ℃ resulted in a progressive recovery of the microstructure, whilst heat treatments above this temperature gave rise to a re-crystallised microstructure. The extent to which nucleation and growth of the y' precipitates and secondary particles were affected by increasing the heat treatment temperature was also characterised. The bulk elastic anisotropy of all samples was measured by resonant ultrasound spectroscopy (RUS) and was found to be consistent with the local textures obtained by electron backscatter diffraction (EBSD). It was observed that the initially strong elastic anisotropy exhibited by the as-SLM material was significantly reduced in the recrystallised samples, although some anisotropy was retained as a result of their elongated grain microstructures.
机译：镍基高温合金的选择性激光熔融（SLM）由于可生产具有复杂几何形状的部件而在航空航天工业中引起了极大的兴趣。但是，需要进一步了解SLM和后续的沉积后热处理对微观结构和机械性能的影响，以确保生产出具有良好结构完整性的组件。在这项研究中，已经分析了镍基高温合金CM247LC在as-SLM和热处理状态下的微观结构，织构和弹性各向异性。 as-SLM微观结构显示出细小的细长细胞，沿构建方向优先排列<001>，且存在明显的细胞间取向错误。在低于1230℃的温度下进行热处理会导致组织逐渐恢复，而在高于此温度的温度下进行热处理会产生重新结晶的组织。还表征了通过提高热处理温度来影响y′沉淀物和次级颗粒的成核和生长的程度。通过共振超声光谱法（RUS）测量了所有样品的体弹性各向异性，发现其与通过电子背散射衍射（EBSD）获得的局部纹理一致。观察到，尽管由于其拉长的晶粒微观结构而保留了一些各向异性，但是在再结晶的样品中，as-SLM材料表现出的最初强烈的弹性各向异性被大大降低了。

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  • 来源
    《Materials Science and Engineering》 |2016年第30期|529-539|共11页
  • 作者

    R. Munoz-Moreno; V.D. Divya; S.L. Driver; O.M.D.M. Messe; T. Illston; S. Baker; M.A. Carpenter; H.J. Stone;

  • 作者单位

    Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK;

    Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK;

    Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK,Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK;

    Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK;

    Materials Solutions, Unit 8, Great Western Business Park, McKenzie Way, Worcester WR4 9GN, UK;

    Materials Solutions, Unit 8, Great Western Business Park, McKenzie Way, Worcester WR4 9GN, UK;

    Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK;

    Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK;

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  • 关键词

    EBSD; Nickel based superalloys; Powder metallurgy; Recrystallisation;

    机译：EBSD;镍基高温合金;粉末冶金;重结晶;

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