V元素对U720Li合金微观组织和力学性能的影响
程安嗥，廖光璟，陈国靖，周志强，武 静，杨前锦，谢 盼*，伍翠兰，陈江华V元素对U720Li合金微观组织和力学性能的影响
程安嗥，廖光璟，陈国靖，周志强，武 静，杨前锦，谢 盼*，伍翠兰，陈江华
（1.湖南大学材料科学与工程学院 高分辨电镜中心，湖南 长沙 410082；2.海南大学热带海洋工程材料及评价全国重点实验室海洋材料表征技术创新研究院，海南 海口 570228；3.海南大学皮米电子显微学海南省重点实验室，海南 海口 570228）
摘 要 U720Li合金具有良好的高温性能，可用作为航空发动机上的涡轮盘材料。为探究V元素对U720Li合金微观组织以及性能的影响，本文利用电磁感应炉制备了4种不同V元素含量（0 wt.%、0.3 wt.%、0.6 wt.%和0.9 wt.%）的难变形高温合金U720Li铸锭并对其进行了均匀化热处理，重点研究了不同V含量对U720Li合金铸态和均匀化态的微结构、力学性能和热变形行为的影响规律。结果表明，V元素在U720Li合金中偏聚于γ基体，起着固溶强化的作用。V元素还能使γ/γ'相的错配度减小，γ'相尺寸增大，从而使合金的硬度提升。U720Li合金中γ'相面积分数与变形抗力呈负相关关系，随着V元素的添加，变形抗力先减小后增加。
关键词 高温合金；元素含量；热压缩；变形抗力；铸态组织
中图分类号：TG113.1；TG416.1+5
文献标识码：A Doi:10.3969/j.issn.1000-6281.2025.06.003
The effect of vanadium element on the microstructure and mechanical properties of U720Li superalloy
CHENG Anhao1，LIAO Guangjing1，CHEN Guojing2，ZHOU Zhiqiang1，WU Jing1，YANG Qianjin1，XIE Pan2，3*，WU Cuilan1，CHENG Jianghua2，3
(Center for High-Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University, Changsha Hunan 410082; 2. Innovation Institute for Ocean Materials Characterization Technology, State Key Lab of Tropic Ocean Engineering Materials and Materials Evaluation, Hainan University, Haikou Hainan 570228; 3. Key Lab of Pico Electron Microscopy of Hainan Province, Hainan University, Haikou Hainan 570228, China )
Abstract U720Li superalloy has excellent high-temperature performance and can be used as a turbine disk material for aircraft engines. In order to investigate the effect of vanadium element on the microstructure and properties of U720Li alloy, four types of high-temperature alloy U720Li ingots with different V element contents of 0 wt.%, 0.3 wt.%, 0.6 wt.%, and 0.9 wt.% were prepared using an electromagnetic induction furnace and homogenization heat treatment. The influences of different V contents on the microstructure, mechanical properties, and thermal deformation behavior of U720Li alloy in as-cast and homogenized states were studied, respectively. The results indicate that V element tends to segregate into the γ matrix of U720Li superalloy, playing a role in solid solution strengthening. The V element can also reduce the mismatch between the γ/γ' phases and increase the size of the γ' phase, thereby improving the hardness of the superalloy. The area fraction of γ' phase in U720Li alloy is negatively correlated with deformation resistance. With the addition of V element, the deformation resistance first decreases and then increases.
Keywords superalloy; element content; thermal compression; deformation resistance; as-cast microstructure