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高亚伟,董建新,姚志浩,张麦仓,牛永吉.GH5188高温合金组织特征及冷热加工过程组织演变[J].稀有金属材料与工程(英文),2017,46(10):2922~2928.[Gao Yawei,Dong Jianxin,Yao Zhihao,Zhang Maicang,Niu Yongji.Microstructure evolution during hot and cold working process and microstructure characteristics of GH5188 superalloy[J].Rare Metal Materials and Engineering,2017,46(10):2922~2928.]
Microstructure evolution during hot and cold working process and microstructure characteristics of GH5188 superalloy
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Received:June 21, 2015  Revised:July 27, 2015
DOI:
Key words: GH5188  microstructure characteristics  microstructure evolution  heat treatment process
Foundation item:国家高技术研究发展计划(863计划)
Author NameAffiliationE-mail
Gao Yawei 北京科技大学材料与科学学院 gaoyw1991@163.com 
Dong Jianxin 北京科技大学材料与科学学院  
Yao Zhihao 北京科技大学材料与科学学院  
Zhang Maicang 北京科技大学材料与科学学院  
Niu Yongji 北京北冶功能材料有限公司  
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Abstract:
      In order to provide theoretical guidance for production process contorl and performance optimization, the microstructure evolution and heat treatment process in the production procecss of GH5188 cobalt-base superalloy were investigated by SEM, EDS and Thermo-Calc software. The result indicates that the main phases of GH5188 alloy include γ, M6C and M23C6. The 1200°C/20h could reduce segregation of as-cast microstructure. Hot-rolled microstructure have a fine grain size, and a large number of aligned carbides precipitate along rolling direction. In the cold-rolled microstructure with serious grain deformation, granular M6C was found to be predominant phase. when the annealing temperature is higher than 1170°C, secondary carbides at the grain boundaries dissolved back into γ and recrystallized grain can grow in normal way.