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首页> 外文期刊>High temperature materials and processes >Microstructural Analysis after Reheat Treatments and Long-Term Heating in Cast Nickel Base Superalloy, GTD-111
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Microstructural Analysis after Reheat Treatments and Long-Term Heating in Cast Nickel Base Superalloy, GTD-111

机译：铸造镍基高温合金GTD-111的再热处理和长期加热后的组织分析

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摘要

The microstructures of cast polycrystalline nickel base superalloy, GTD-111, operated by Electricity Generating Authority of Thailand (EGAT) for long-term services were investigated by SEM after different reheat treatment conditions. It was found by SEM investigation that SEM micrograph of the exposed specimen after long-term service could be recovered in some degree by a re-solution treatment followed by primary and secondary aging treatments. During solution treatment, the coarse carbides and gamma prime precipitates were partially dissolved into the matrix. Then specimens were heat treated through series of aging resulting in uniformly dispersed precipitation of gamma prime particles, which is more uniform than those in the long-term exposed microstructure. However, it was also found that the after various reheat treatment conditions, the microstructures are much more uniform than that of the received one. Generally, solution treatment with higher temperature and/or longer duration provided much more uniform microstructural characteristics withrnhigher density of γ' particles and in more proper size and shape of the particles than those of lower temperature/shorter duration solutioning. After long-term heating, all microstructures became more degraded, which microstructures with low temperature and/or short duration solutioning provided the most degraded microstructure.
机译：在不同的再热处理条件下，由SEM研究了泰国发电局（EGAT）提供的用于长期服务的铸造多晶镍基高温合金GTD-111的显微组织。通过SEM研究发现，长期暴露后的标本的SEM显微照片可以通过先进行固溶处理再进行一次和二次时效处理在一定程度上得到恢复。在固溶处理过程中，粗大的碳化物和γ初生沉淀物部分溶解在基体中。然后，通过一系列时效对样品进行热处理，以使γ′粒子的沉淀物均匀分散，这比长期暴露的微观结构中的样品更均匀。但是，还发现在各种再热处理条件下，其显微组织比所接受的显微组织更为均匀。通常，与较低温度/较短持续时间的固溶处理相比，较高温度和/或较长持续时间的固溶处理提供了更均匀的微观结构特征，具有更高的γ'颗粒密度和更合适的颗粒尺寸和形状。在长期加热之后，所有的微观结构都变得更加降解，而低温和/或短时固溶的微观结构提供了最退化的微观结构。

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  • 来源
    《High temperature materials and processes》 |2010年第4期|p.277-285|共9页
  • 作者

    P. Wangyao; rnP. Suvanchai; rnN. Chuankrerkkul; V. Krongtong; rnA. Thueploy; rnW. Homkrajai;

  • 作者单位

    Metallurgical Engineering Department, Engineering Faculty, Chulalongkorn University, Bangkok, Thailand;

    rnMetallurgical Engineering Department, Engineering Faculty, Chulalongkorn University, Bangkok, Thailand;

    rnMetallurgy and Materials Science Research Institute (MMRI), Chulalongkorn University, Bangkok, Thailand;

    rnNational Metals and Materials Technology Center (MTEC), Pathumthani, Thailand;

    rnMetallurgy and Materials Science Research Institute (MMRI), Chulalongkorn University, Bangkok, Thailand;

    rnElectricity Generating Authority of Thailand (EGAT), Nonthaburi, Thailand;

  • 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);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    microstructural refurbishment; rejuvenation; reheat treatment; superalloys; lifetime extension; GTD-111;

    机译：显微结构翻新;复兴再热处理;高温合金延长寿命;GTD-111;

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