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,2020,49(6):2147~2153.[Xuan Zhou,Yuli Li,Tengfei Ma,Yusheng Zhang,Yunjin Lai,Kaixuan Wang,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.]
FGH97合金连续冷却过程中的γ′相析出行为
投稿时间:2019-05-15  修订日期:2019-06-12
中文关键词:  高温合金  冷却速度  γ′相  析出行为
基金项目: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)
中文摘要:
      为了研究固溶冷却速度对粉末高温合金FGH97的γ′相析出行为,利用Gleeble-3800热模拟试验机以及模拟热处理炉获得了15~240°C/min的冷却速度,主要分析了不同冷却速度对二次γ′相尺寸、形貌以及力学性能的影响。研究发现,二次γ′相在冷却过程中发生析出、长大,甚至是粗化,并且其形貌、尺寸以及析出温度、析出范围主要取决于冷却速度,而时效处理几乎没有影响。在15°C/min的较低冷速下,二次γ′相发生粗化并分裂,形成0.38μm左右的方形颗粒,这些二次相周围还会析出三次γ′相;而当冷却速度达到60°C/min时,二次γ′相尺寸降至0.22μm左右,三次γ′相析出则被完全抑制。在析出相含量、尺寸以及γ/γ′错配度的共同作用下,合金强度随着冷却速度的增加呈现出先降低后升高的趋势。
Investigation on the precipitation behavior of γ′ in superalloy FGH97 during continuous cooling from supersolvus temperature
英文关键词:Ni-base superalloy  cooling rate  γ′  precipitation behavior
英文摘要:
      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.
作者单位E-mail
周宣 西北有色金属研究院 zhouxuanjs001@163.com 
李宇力 西北有色金属研究院 155035111186@163.com 
马腾飞 西北有色金属研究院  
张于胜 西北有色金属研究院  
赖运金 西安欧中材料科技有限公司  
王凯旋 西部超导材料科技股份有限公司  
张平祥 西北有色金属研究院  
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