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K424合金超温后显微组织与典型性能研究
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钢铁研究总院,钢铁研究总院,钢铁研究总院,钢铁研究总院

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Investigation about microstructures and typical mechanical properties of overheated K424 superalloy
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Central Iron Steel Research Institute,Central Iron Steel Research Institute,Central Iron Steel Research Institute,Central Iron Steel Research Institute

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    摘要:

    以标准热处理态的K424合金为研究对象,进行不同条件的超温热处理(1050℃~1150℃/2h,空冷),对超温后的合金进行975℃/196MPa条件下的高温持久实验和室温拉伸实验,并对其显微组织和断裂特征进行表征。结果表明:标准热处理后的K424合金经过1050℃~1150℃超温处理2h并空冷后,力学性能仅发生轻微降低,其力学性能指标仍明显高于标准规定值。组织表征结果表明:经过不同温度超温处理并空冷后合金晶粒、晶界和枝晶间γ’相的形貌并未呈现出明显的变化规律。一次γ’相的立方度提高以及γ通道中二次γ’相析出是合金超温后力学性能仅轻微降低的主要原因。同时,对超温后K424合金的高温和室温断裂机制也进行了讨论。

    Abstract:

    Stress rupture test at 975℃/196MPa and room temperature tensile test were conducted in standard heat-treated K424 alloy after overheating at different conditions (1050℃~1150℃/2h, air cooling), the characterization of microstructures and fracture features were then investigated. The results showed that mechanical properties of standard heat-treated K424 alloy were only slightly lower after overheating at 1050℃~1150℃ for 2h, the mechanical property indexes were obviously higher than the values in standard. Microstructural characterization indicated that grain morphology, grain boundary morphology and γ’ phase in the interdendritic regions showed no significant change after overheating at different conditions. The more cuboidal primary γ’ phase and the precipitation of secondary γ’ phase in γ channel were responsible for the slightly diminished mechanical properties after overheating. In addition, the high temperature and room temperature fracture mechanisms of overheated K424 alloy were also discussed.

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袁晓飞,吴剑涛,李俊涛,燕平. K424合金超温后显微组织与典型性能研究[J].稀有金属材料与工程,2018,47(6):1779~1785.[Yuan Xiaofei, Wu Jiantao, Li Juntao, Yan Ping. Investigation about microstructures and typical mechanical properties of overheated K424 superalloy[J]. Rare Metal Materials and Engineering,2018,47(6):1779~1785.]
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  • 收稿日期:2017-11-06
  • 最后修改日期:2017-12-28
  • 录用日期:2018-01-09
  • 在线发布日期: 2018-09-06
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