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首页> 外文期刊>Journal of Materials Research >Precipitation behavior of type 347H heat-resistant austenitic steel during long-term high-temperature aging
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Precipitation behavior of type 347H heat-resistant austenitic steel during long-term high-temperature aging

机译：347H型耐热奥氏体钢在长期高温时效过程中的析出行为

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摘要

The microstructural evolution of type 347H heat-resistant austenitic steel during long-term aging at 700-900 ℃ was investigated by using a transmission microscope, a scanning electron microscope, and electron energy spectrum technology. The microstructural examination showed the typical micrographs of MX carbonitrides and M_(23)C_6 carbides after aging. The existence of the Z phase (NbCrN) at the grain boundaries during aging was identified. Meanwhile, the possible precipitation sequence of these particles was also confirmed. In the beginning of aging, fine Nb(C,N) precipitates first, then, M_(23)C_6 carbides precipitate along the grain boundaries. Finally, the Z phase is also observed at the grain boundaries. Moreover, the influence of isothermal holding temperature on the precipitation of MX carbonitrides and M_(23)C_6 carbides was discussed. The various microstructural characterizations showed that the M_(23)C_6 carbides and MX carbonitrides precipitate more easily with the increase of aging temperature. Furthermore, the number and the size of MX particles and M_(23)C_6 carbides increase when the isothermal holding time is prolonged.
机译：利用透射显微镜，扫描电子显微镜和电子能谱技术研究了347H型耐热奥氏体钢在700-900℃长期时效时的组织演变。显微组织检查显示了时效后MX碳氮化物和M_（23）C_6碳化物的典型显微照片。确定了时效过程中在晶界处存在Z相（NbCrN）。同时，也证实了这些颗粒可能的沉淀顺序。在时效开始时，首先析出细小的Nb（C，N），然后沿晶界析出M_（23）C_6碳化物。最后，在晶界处也观察到Z相。此外，还讨论了等温保温温度对MX碳氮化物和M_（23）C_6碳化物沉淀的影响。各种微观结构特征表明，随着时效温度的升高，M_（23）C_6碳化物和MX碳氮化物更容易沉淀。此外，当等温保持时间延长时，MX颗粒和M_（23）C_6碳化物的数量和尺寸增加。

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  • 来源
    《Journal of Materials Research》 |2015年第23期|3642-3652|共11页
  • 作者

    Yinghui Zhou; Yanmo Li; Yongchang Liu; Qianying Guo; Chenxi Liu; Liming Yu; Chong Li; Huijun Li;

  • 作者单位

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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