黄乾尧
,
师燕渝
金属学报
采用化学分离联合衍射定量分析法,对多相镍基合金进行了定量相分析研究,得到了850—1000℃下MC的分解和M_(23)C_6,M_6C的析出与热暴露时间的双曲线型变化规律。热暴露过程中M_(23)C_6的元素组成一直在变化,刚析出时为(Cr_(0.67)Mo_(0.13)Ni_(0.13)Co_(0.07))_(23)C_6,其后Cr量增高,Mo,Ni和Co量减少,最终组成为(Cr_(0.88)Mo_(0.07)Ni_(0.03)Co_(0.02))_(23)C_6。热暴露温度愈高,M_(23)C_6达到最终组成状态愈快。
关键词:
镍基铸造高温合金
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carbide
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hot exposure
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electrolytic extraction
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X-ray diffraction analysis
HUANG Qianyao SHI Yanyu Central Iron and Steel Research Institute
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Ministry of Metallurgical Industry
,
Beijing
,
China Department No.5
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China
金属学报(英文版)
The quantitative analytical method combining the electrolytic extraction with X-ray diffraction analysis to determine the carbides and TCP in a Ni-base superalloy was developed.The variation of decomposition of MC and precipitation of M_(23)C_6 and M_6C with hot exposure time at 850—1000℃ is shown to conform to hyperbolic law.The elemental con- stitution of M_(23)C_6 changes continutously during the hot exposure process.At the primary stage the constitution of the precipitates is(Cr_(0.67)Mo_(0.13)Ni_(0.13)Co_(0.07))_(23)C_6.Then with in- creasing Cr and decreasing Mo,Ni and Co it finally becomes(Cr_(0.88)Mo_(0.07)Ni_(0.03)Co_(0.02))_(23)C_6. The higher the hot exposure temperature,the faster the final constitution of M_(23)C_6 may be achieved.
关键词:
Ni-base superalloy
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