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首页> 外文期刊>Materials Science and Engineering >Microstructural evolution and mechanical properties of a nickel-based superalloy through long-term service
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Microstructural evolution and mechanical properties of a nickel-based superalloy through long-term service

机译：长期服务的镍基高温合金的组织演变和力学性能

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摘要

Microstructures and mechanical properties of nickel-based superalloy (GH783 alloy) bolts used in a power plant 660 MW Ultra supercritical unit were investigated. The results showed that the material's strength increased monotonically but the elongation and impact toughness both decrease as an exponential decay trend with the service time. Microstructural examinations revealed that γ' phase within the alloy matrix coarsened significantly leading to an enhancement in strength. Meanwhile, additional γ' precipitated gradually within the grain-boundary β phase, causing the weakening of the grain boundaries, thus a reduction in ductility. The evolution tendency here obtained could be used to approximately predict the variation tendency of mechanical properties with the service time for GH783 alloy used as bolt material.
机译：研究了用于电厂660 MW超超临界机组的镍基高温合金（GH783合金）螺栓的组织和力学性能。结果表明，材料的强度单调增加，但伸长率和冲击韧性均随着使用时间的延长呈指数衰减趋势。显微组织检查表明，合金基体内的γ'相明显变粗，导致强度提高。同时，额外的γ'在晶界β相内逐渐沉淀，导致晶界变弱，从而延展性降低。此处获得的演变趋势可用于大致预测用作螺栓材料的GH783合金的机械性能随使用时间的变化趋势。

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  • 来源
    《Materials Science and Engineering》 |2016年第22期|184-189|共6页
  • 作者

    Tao Jiang; Liangbin Chen; Feng Jiang; Heping Cai; Jun Sun;

  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao tong University, Xi'an 710049, China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao tong University, Xi'an 710049, China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao tong University, Xi'an 710049, China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao tong University, Xi'an 710049, China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao tong University, Xi'an 710049, China;

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

    Nickel-based superalloy; Microstructure; Mechanical properties; Bolt material;

    机译：镍基高温合金;微观结构机械性能螺栓材质;

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