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韩国明,李飞,陈晓燕,李玉龙,王飞,汪东红,孙宝德.镍基变形高温合金中g′ 相的多尺度分布行为及其对热变形性能的影响[J].稀有金属材料与工程(英文),2019,48(9):2821~2828.[Han Guoming,Li Fei,Chen Xiaoyan,Li Yulong,Wang Fei,Wang Donghong and Sun Baode.Multimodal distribution of g′ phase and effect on hot deformation in a wrought nickel base superalloy[J].Rare Metal Materials and Engineering,2019,48(9):2821~2828.]
Multimodal distribution of g′ phase and effect on hot deformation in a wrought nickel base superalloy
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Received:April 16, 2018  Revised:October 22, 2018
DOI:
Key words: wrought superalloy, ?g′ precipitate, heat treatment, hot deformation
Foundation item:Aerospace Support Fund (Grant No. 15GFZ-JJ20-04), the Industry-University-Research Cooperation Annual Plan of Shanghai under Project No. CXY-2016-004 and China Postdoctoral Science Foundation 17Z102060125
Author NameAffiliation
Han Guoming,Li Fei,Chen Xiaoyan,Li Yulong,Wang Fei,Wang Donghong and Sun Baode  
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Abstract:
      The microstructural evolution of different generations of ?′ precipitates during various heat treatment processes of a nickel base superalloy has been investigated. After solutionizing in the single ? phase field, continuous cooling, interrupted cooling and isothermal annealing tests were performed and characterization of the precipitates was carried out by scanning electron microscopy. It is found that a monomodal size distribution of the secondary ?′ precipitates can be achieved at a very high cooling rate in the continuous cooling process. With the decrease of the cooling rate, the secondary ?′ precipitates grow gradually and gather together to form a flowery morphology. When the secondary supersaturation is developed in the vicinity of the secondary ?′ precipitates during isothermal annealing, the water-quenched tertiary ?′ precipitates are produced and result in a bimodal size distribution of ?′ precipitates with the larger secondary precipitates. Furthermore, the effects of the secondary ?′ particle growth on the hot deformation are also discussed.