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GH4169合金均勻化過程中的相變動態(tài)原位研究
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1.天津職業(yè)技術(shù)師范大學(xué);2.天津重型裝備工程研究有限公司;3.中國科學(xué)院金屬研究所

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天津市科技重大專項(xiàng)(18ZXJMTG00050)；天津市自然科學(xué)基金(19JCYBJC17100)


Dynamic in-situ study on the phase transition of GH4169 superalloy during homogenization process
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1.Tianjin University of Technology and Education,Tianjin Key Laboratory of High Speed Cutting and Precision Processing,Tianjin,China;2.Tianjin Heavy Equipment Engineering Research Co,Ltd,Tianjin,China;3.Institute of Metal Research,Chinese Academy of Sciences,Shenyang,China

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    摘要:

    為揭示GH4169合金在均勻化處理過程中成分和組織的演變規(guī)律，利用高溫金相顯微鏡實(shí)時(shí)原位觀察熱處理過程中合金的顯微組織，定量分析了冷卻后合金中Laves相的粒度分布，探討了合金中Nb元素在熱處理前后的分布規(guī)律。GH4169合金升溫到1151℃左右時(shí)，鄰近Laves相周圍區(qū)域開始初熔。熱處理后GH4169合金中Laves相顆粒數(shù)增加，但Laves相最大顆粒尺寸顯著減小，小顆粒Laves相比例略有增加。在1180℃保溫時(shí)，GH4169合金中已有液相存在，但NbC未溶解。熱處理后合金中原枝晶間黑色區(qū)域的Nb元素偏析仍存在，但Nb元素的在枝晶軸γ相中分布更加均勻。

    Abstract:

    In order to reveal the evolution of composition and microstructure of GH4169 alloy during the homogenization treatment, the alloy microstructure during heat treatment were in-situ observed by high temperature metallographic microscope. The particle size distribution of Laves phase in the alloy after cooling was analyzed by quantitative metallographic analysis. The distribution characteristics of Nb element in alloy before and after heat treatment were analyzed by EPMA. When the heating temperature of GH4169 alloy rises about 1151 ℃, the initial melting happens around the Laves phase. The particle number of Laves phase in GH4169 alloy increased after heat treatment, the particle size of maximum Laves phase decreased significantly, and the proportion of small Laves phase in alloy increased slightly. At 1180 ℃, there was a certain amount of liquid phase existing in GH4169 alloy, but the NbC phase undissolved. After heat treatment, the segregation of Nb element in the black area between the primary dendrites still existed, but the distribution of Nb element in the γ phase dendrite became more uniform.

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劉艷梅,趙美蘭,馮輝,孫文儒,王鐵鋼. GH4169合金均勻化過程中的相變動態(tài)原位研究[J].稀有金屬材料與工程,2021,50(4):1334~1341.[LIU Yan-mei, ZHAO Meilan, FENG Hui, SUN Wenru, WANG Tie-gang. Dynamic in-situ study on the phase transition of GH4169 superalloy during homogenization process[J]. Rare Metal Materials and Engineering,2021,50(4):1334~1341.]
DOI：10.12442/j. issn.1002-185X.20200383

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  • 收稿日期:2020-06-02
  • 最后修改日期:2020-07-04
  • 錄用日期:2020-07-21
  • 在線發(fā)布日期: 2021-05-08
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