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周宣,李宇力,马腾飞,张于胜,赖运金,王凯旋,张平祥.FGH97合金连续冷却过程中的γ′相析出行为[J].稀有金属材料与工程(英文),2020,49(6):2147~2153.[Xuan Zhou,Yuli Li,Tengfei Ma,Yusheng Zhang,Yunjin Lai,Kaixuan Wang and Pingxiang Zhang.Investigation on the precipitation behavior of γ′ in superalloy FGH97 during continuous cooling from supersolvus temperature[J].Rare Metal Materials and Engineering,2020,49(6):2147~2153.]
Investigation on the precipitation behavior of γ′ in superalloy FGH97 during continuous cooling from supersolvus temperature
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Received:May 15, 2019  Revised:June 12, 2019
DOI:
Key words: Ni-base superalloy  cooling rate  γ′  precipitation behavior
Foundation item:中国博士后科学基金资助项目(No. 2017M623333XB、No. 2018M643760)、陕西省自然科学基础研究计划资助项目(No.2019JQ-169、No.2019JQ-406)、陕西省博士后科学基金资助项目(No.2018BSHQYXMZZ38)
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Xuan Zhou,Yuli Li,Tengfei Ma,Yusheng Zhang,Yunjin Lai,Kaixuan Wang and Pingxiang Zhang  
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Abstract:
      This paper presents results from a research initiative aimed at the γ′ precipitation behavior in superalloy FGH97 during continuous cooling from supersolvus temperature by Gleeble-3800 and heat treatment simulator furnace at cooling rates of 15~240 °C/min. The influence of cooling rates on γ′ size, paticle morphology and tensile strength is investigated. During cooling from supersolvus temperature γ′ nucleation and growth, even coarsening, simultaneously occur. However, ageing treatment seems to exert little influence on γ′ evolution. At the cooling rate of 15 °C/min a large number of secondary γ′ split and form square paticles with ~0.38 μm. Meanwhile, there are lots of small tertiary spherical γ′ around secondary γ′. As the cooling rate decreasing to 60 °C/min the size of secondary γ′ decreases to ~ 0.22 μm and the precipitation of tertiary γ′ is completely inhibited. The tensile strength tends to increase after an initial decrease with a decline of cooling rates, due to the combined influence of γ′ volume fraction, particle size and γ/γ′ mismatch.