热处理制度对 K465 合金组织和性能的影响
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北京航空材料研究院中航工业失效分析中心

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TG132. 3

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Influence of Heat Treatment Process on Microstructureand Mechanical Properties of Cast Superalloy K465
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    摘要:

    研究了两种热处理工艺对 K465 铸造高温合金组织和力学性能的影响,并与原叶片合金进行了
    对比分析。 采用普通工艺和热等静压工艺制造 K465 合金,利用光学显微镜和扫描电镜观察合金的显微组织
    形貌,测试了拉伸性能和持久性能。 结果表明,与原叶片相比,K465 铸造高温合金叶片的组织特点是,晶粒度
    较小、枝晶组织偏大、γ′相尺寸较大。 热等静压工艺可消除 K465 合金中的铸造疏松,普通工艺叶片的疏松分布
    较密集。 与普通工艺相比,热等静压工艺使合金中 γ′相尺寸明显减小,枝晶组织致密化,拉伸性能和持久性能
    有所提高。 K465 合金中少量的疏松、致密的枝晶组织、规则的枝晶排列、较小的 γ′相尺寸可能是决定叶片良好
    振动疲劳性能的关键因素。

    Abstract:

    Two kinds of heat treatment process was studied on the influence of the microstructure and mechanical
    properties of K465 casting superalloy, the comparison with the same level superalloy used in the generic blade was
    performed. The microstructures of K465 alloy were observed using optical microscopy (OM) and scan electron mi-
    croscopy (SEM). The tensile and stress rupture properties of K465 alloy were measured. The results show that the
    characteristics of blade made in china are smaller grain size,bigger dendritic structure, bigger size of γ′ phase by
    comparison with the same level superalloy used in the generic blade. The hot isostatic pressing (HIP) process may be
    partially or completely eliminated the loose in K465 alloy, however, the loose distribution is dense for the ordinary
    process. HIP process can effectively reduce the size of γ′ phase, make dendritic densification and improve the tensile
    and stress rupture properties. A small amount of loose, dense dendritic structure, regular dendritic arrangement and
    the smaller size of γ′ phase may be the key factor of vibration fatigue property for the blade.

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顾玉丽.热处理制度对 K465 合金组织和性能的影响[J].宇航材料工艺,2015,45(6).

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  • 在线发布日期: 2016-11-28
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