GH3230合金蠕变变形及断裂机理研究-中国材料进展

文章信息/Info

作者:: 任晓东; 侯成; 许琦鹏; 周芳菁; 曾嘉迅; 杨思远; 范学领; 1. 西安交通大学航天航空学院西安市极端环境服役性能与防护技术重点实验室，陕西西安 710049 2. 中国航发湖南动力机械研究所，湖南株洲 412002

Author(s):: REN Xiaodong; HOU Cheng; XU Qipeng; ZHOU Fangjing; ZENG Jiaxun; YANG Siyuan; FAN Xueling; 1. Xi’an Key Laboratory of Extreme Environment and Protection Technology, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China 2. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China

Keywords:: GH3230; nickel-based superalloy; modified θ parameter method; composite time-hardening model; creep deformation

摘要:: 作为新一代火焰筒材料，GH3230镍基高温合金在极端高温高压环境中服役时的蠕变性能尤其重要。开展了GH3230高温合金在不同应力、不同温度（800，900和1000 ℃）下的蠕变实验，基于修正θ参数法和复合时间硬化模型对GH3230合金的蠕变变形进行了预测分析，并对其高温蠕变断裂机理进行了阐释。结果表明，GH3230合金的蠕变寿命与温度和应力有关。温度越高、应力越大，合金的蠕变寿命越短。修正θ参数法在温度和应力均较高时能较好地预测蠕变变形，而复合时间硬化模型在温度和应力均较低时能较好地预测蠕变变形。GH3230合金的蠕变断裂为孔洞聚集型的解理断裂，断裂路径表明主要由晶界迁移主导，且蠕变温度越高断口韧窝尺寸越大。

Abstract:: As a new generation burner inner liner material, the creep properties of GH3230 nickel-based superalloy are particularly important when serving in extreme high temperature and high pressure environments. In this paper, the creep experiments of GH3230 superalloy under different stresses and temperatures(800, 900 and 1000 ℃) were conducted. The creep deformation of GH3230 alloy was predicted based on the modified θ parameter method and composite time-hardening model, and the high temperature creep fracture mechanism was explained. The results show that the creep deformation of GH3230 alloy is closely related to temperature and stress. The higher the temperature and stress, the shorter the creep life. The modified θ parameter method can predict the creep deformation better when the temperature and stress are high, while the composite time-hardening model can predict the creep deformation better when the temperature and stress are low. The creep fracture of GH3230 alloy is a cavity aggregation cleavage fracture, and the fracture path shows that it is mainly dominated by grain boundary migration, and the higher the creep temperature, the larger the fracture dimple size.