一种镍基单晶高温合金中碳化物热稳定性研究

一种镍基单晶高温合金中碳化物热稳定性研究

龙海波¹，李 晴¹，向思思¹，王晓冬^1，2，韦 华³，毛圣成^1*,  张 泽^1，4，韩晓东¹

（1.北京工业大学固体微结构与性能研究所，北京100124；2.中国人民武装警察部队学院基础部，河北廊坊065000；3. 中国科学院金属研究所金属腐蚀与防护国家重点实验室，辽宁沈阳110016;4. 浙江大学材料科学与工程学院，电子显微镜中心，硅材料国家重点实验室，浙江杭州310027）

摘要：利用SEM、TEM研究了一种镍基单晶高温合金中碳化物在950 ºC时效不同时间的退化规律。固溶处理过程中形成的MC碳化物随时效时间的增加而逐渐退化为M₆C和M₂₃C₆碳化物。同时，由于在时效处理过程中Re元素进入M₆C碳化物中，破坏了其结构稳定性，促使M₆C碳化物也可以退化为M₂₃C₆碳化物。至时效3000 h时，没有观察到碳化物退化的逆反应。本研究可以为高温合金高温下服役的稳定性提供实验参考。

关键词：镍基单晶高温合金；碳化物；退化反应

中图分类号：TG132.3⁺2；TG146.1⁺5；TG115.21⁺5.3；O657.62  文献标识码：A   doi:10.3969/j.1000-6281.2015-04.003

Thermal stability of carbides in a Ni-based single crystal superalloys

LONG Hai-bo¹，LI Qing¹，XIANG Si-si¹，WANG Xiao-dong^{1, 2}，WEI Hua³，MAO Sheng-cheng^1*,ZHANG Ze^1,4, HAN Xiao-dong¹

(1. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124；2. Fundament Department, Chinese People's Armed Police Force, Langfang Hebei 065000；3. Superalloys Division, Institute of Metal Research, CAS, Shenyang Liaoning 110016；4. State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou Zhejiang 310027, China)

 Abstract:The degradation of carbides in a nickel-based single crystal superalloys exposed at 950 ℃for different times were investigated by scanning electron microscopy and transmission electron microscopy. The MC carbide formed during the solution treatment gradually degenerates to M₆C and M₂₃C₆ carbides with the increase of exposure time. Degradation of the M₆C carbides to M₂₃C₆ is due to the entering of Re into the M₆C carbides during aging treatment, which breaks the structure stability of M₆C. There is no reverse reaction of the degradation, even after 3000 h exposure. This study provides experimental insight into the structure stability of superalloys serve at high temperature.

Keywords:Ni-based single crystal superalloys; carbide; degradation

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