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Effect of long-term thermal exposure on the hot ductility behavior of GH3535 alloy

机译：长期热暴露对GH3535合金热延展行为的影响

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摘要

The hot ductility behavior of Ni-16Mo-7Cr alloys (named GH3535) exposed at 700 ℃ for different durations has been investigated by means of tensile test. It was found that the alloy exhibited a constant low ductility within the first 10 h exposure, and then showed an increasing ductility with the exposure time until 1000 h. After that, the ductility of the alloy decreased gradually with the increasing exposure time up to 10000 h. Detailed microstructural investigations using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) have shown that the change in the ductility of the alloy with the exposure time could be attributed to the precipitation of M_(12)C carbide at the grain boundary. Such precipitates with size of 200 nm, which are formed during the thermal exposure within 1000 h, can significantly restrain the grain boundary sliding and crack initiation, resulting in the high ductility of the alloy. Further exposure will cause the coarsening of the carbides, making them as the source of grain boundary cracks, hence decreases the ductility of the alloy.
机译：通过拉伸试验研究了Ni-16Mo-7Cr合金（GH3535）在700℃下暴露不同时间的热延展性。发现该合金在最初的10 h暴露中表现出恒定的低延展性，然后随着暴露时间（直至1000 h）而呈现出增加的延展性。此后，随着暴露时间的增加，合金的延展性逐渐下降，直至10000 h。使用扫描电子显微镜（SEM），能量色散光谱（EDS），电子背散射衍射（EBSD）和透射电子显微镜（TEM）进行的详细显微组织研究表明，合金的延展性随暴露时间的变化是可以归因于的M_（12）C碳化物在晶界的析出。这种在1000 h内的热暴露过程中形成的尺寸为200 nm的沉淀物可以显着抑制晶界滑动和裂纹萌生，从而导致合金的高延展性。进一步暴露会导致碳化物粗大化，使其成为晶界裂纹的来源，因此降低了合金的延展性。

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  • 来源
    《Materials Science and Engineering》 |2016年第15期|299-306|共8页
  • 作者

    F.F. Han; B.M. Zhou; H.F. Huang; B. Leng; Y.L. Lu; Z.J. Li; X.T. Zhou;

  • 作者单位

    Thorium Molten Salts Reactor Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, China;

    Thorium Molten Salts Reactor Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, China;

    Thorium Molten Salts Reactor Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, China;

    Thorium Molten Salts Reactor Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, China;

    Thorium Molten Salts Reactor Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, China;

    Thorium Molten Salts Reactor Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, China;

    Thorium Molten Salts Reactor Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, China;

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  • 正文语种 eng
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  • 关键词

    CH3535 alloy; Hot ductility; Thermal exposure; Grain boundary sliding; Carbides;

    机译：CH3535合金;热延展性;热暴露;晶界滑动;硬质合金;

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