• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2010, Vol. 46 ›› Issue (12): 48-52.

• 论文 • 上一篇    下一篇

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690合金等温热处理过程中晶界碳化物和贫铬区演化规律

郑磊;焦少阳;董建新;张麦仓   

  1. 北京科技大学材料科学与工程学院
  • 发布日期:2010-06-20

Evolution of Grain Boundary Carbide and Cr-depletion Region in Alloy 690 during Isothermal Treatment

ZHENG Lei;JIAO Shaoyang;DONG Jianxin;ZHANG Maicang   

  1. School of Materials Science and Engineering, University of Science and Technology Beijing
  • Published:2010-06-20

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摘要： 应用透射电子显微镜研究690合金固溶处理(1 020 ℃/15 min)后在不同温度(650 ℃, 715 ℃, 800 ℃)和不同时间(1～40 h)等温热处理的晶界碳化物析出行为和贫铬区演化状况，总结热处理工艺参数对碳化物和贫铬区的影响，指出贫Cr区是由碳化物的析出长大行为与原子迁移共同作用的结果，并从微观组织变化角度确定最佳的热处理制度。研究结果表明，800 ℃等温热处理时碳化物在晶界两侧同时析出；715 ℃/10～20 h时晶界附近铬分布最为平缓。690合金最佳等温热处理制度为715 ℃/10～20 h。

关键词: 等温热处理, 镍基高温合金, 贫铬区, 微观组织

Abstract: The precipitation behavior of grain boundary carbides and the evolution of Cr-depletion region in Ni-based superalloy 690 after solid solution treatment (1 020 ℃/15 min) followed by heat treatment at different temperatures (650 ℃, 715 ℃, 800 ℃) for various times (1～40 h) are studied by means of transmission electron microscopy. Based on the analysis of microstructure, an optimal heat treatment is given. It is concluded from the present investigation that carbides precipitate on both sides of the grain boundary at 800 ℃. In addition, the distribution of Cr near grain boundary is most smooth at the treatment of 715 ℃/10～20 h. As a whole, the optimal heat treatment process is 751 ℃/10～20 h.

Key words: Cr-depletion region, Isothermal treatment, Microstructure, Ni-based superalloy

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