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鎳基變形高溫合金中g(shù)′ 相的多尺度分布行為及其對熱變形性能的影響
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1.上海交通大學;2.中國航發(fā)商用航空發(fā)動機有限責任公司

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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


Multimodal distribution of g′ phase and effect on hot deformation in a wrought nickel base superalloy
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Shanghai Jiao Tong University

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    摘要:

    本文主要研究了鎳基變形高溫合金在不同熱處理過程中g(shù)′相的析出、形貌、尺寸及分布行為。通過掃描電鏡觀察分析高溫固溶熱處理后連續(xù)冷卻、中斷固溶冷卻以及等溫時效淬火后的組織構(gòu)成。研究結(jié)果表明，固溶處理后連續(xù)冷去過程中，當冷卻速率較高時，二次g′尺寸大小均勻，呈現(xiàn)單峰分布，隨著冷卻速率降低，二次g′尺寸增加，逐漸聚集長大并呈現(xiàn)花狀形貌；當?shù)葴貢r效過程中二次g′周圍過冷度重新建立，隨后淬火過程中會產(chǎn)生三次g′，三次g′與二次g′構(gòu)成雙峰分布。在此基礎(chǔ)上，探討了g′相析出及演化對合金熱變形行為的影響。

    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.

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韓國明,李飛,陳曉燕,李玉龍,王飛,汪東紅,孫寶德.鎳基變形高溫合金中g(shù)′ 相的多尺度分布行為及其對熱變形性能的影響[J].稀有金屬材料與工程,2019,48(9):2821~2828.[Han Guoming, Li Fei, Chen Xiaoyan, Li Yulong, Wang Fei, Wang Donghong, 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.]
DOI：10.12442/j. issn.1002-185X.20180378

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  • 收稿日期:2018-04-16
  • 最后修改日期:2018-10-22
  • 錄用日期:2018-11-08
  • 在線發(fā)布日期: 2019-10-09
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