锻压技术

GH4720Li高温合金盘锻件不同变形区的组织演变及力学性能

英文标题：Microstructure evolution and mechanical properties in different deformation zones of superalloy GH4720Li disk forgings

作者：周星1 董瑞峰1 解玉昌1 李泳宽1 张伟2 曲敬龙3 王庆增4 李剑1 徐天元1 新巴雅尔1 汪威5

单位：1. 内蒙古工业大学材料科学与工程学院 2. 南京理工大学材料科学与工程学院 3. 北京钢研高纳科技股份有限公司 4. 宝物特种冶金有限公司 5. 内蒙古第一机械集团有限公司

关键词：GH4720Li高温合金自由锻造变形区 γ′相二次γ′相

分类号：TG132.3

出版年,卷(期):页码：2025,50(8):11-19

摘要：

为探究锻造过程中GH4720Li高温合金受力不均对组织、性能的影响，对GH4720Li高温合金锻件不同变形区微观组织进行表征，并进行力学性能测试。结果表明，锻件不同变形区的显微组织存在差异，大变形区的晶粒均匀细小，难变形区存在大量的不完全再结晶组织和细晶带，小变形区的晶粒尺寸与棒材的晶粒尺寸相差不大。扫描电镜结果表明，相当数量的一次γ′相在锻造过程中熔化，二次γ′相在锻造加热过程中几乎完全熔化，然后在锻造和冷却过程中再次析出。大变形区的二次γ′相粗化，难变形区的二次γ′相析出较少，小变形区的二次γ′相均匀细小。电子背散射衍射结果表明，大变形区基体中存在大量的小角度晶界，难变形区和小变形区的小角度晶界含量较少。室温下，晶粒最细小的大变形区组织的强度和塑性最高；650 ℃时，晶界的强度降低，而晶粒粗大且存在均匀细小γ′相的小变形区的强度和塑性最高。

In order to explore the influence of uneven force on the microstructure and properties of superalloy GH4720Li during the forging process, the microstructures in different deformation zones of superalloy GH4720Li forgings were characterized, and the mechanical property tests were conducted. The results indicate that there are differences in the microstructures of different deformation zones of forgings. The grains in the large deformation zone are uniform and fine, while there are a large number of incompletely recrystallized structures and fine grain bands in the difficult deformation zone. The grain size in the small deformation zone is not much different from the grain size of bar. The results of scanning electron microscopy (SEM) show that a considerable amount of primary γ′ phase melts during the forging process, and the secondary γ′ phase almost completely melts during the forging heating process and precipitates again during the forging and cooling process. The secondary γ′ phase in the large deformation zone is coarsened, the secondary γ′ phase in the difficult deformation zone precipitates less, and the secondary γ′ phase in the small deformation zone is uniform and fine. The results of electron backscatter diffraction (EBSD) show that there are a large number of small-angle grain boundaries (LAGBs) in the matrix of the large deformation zone, and the content of small-angle grain boundaries (LAGBs) in the difficult deformation zone and small deformation zone are lawer. At room temperature, the strength and plasticity of the large deformation zone with the finest grains are the highest. At 650 ℃, the strength of grain boundaries decreases, while the strength and plasticity of the small deformation zone with coarse grains and uniform and fine γ′ phase are the highest.

基金项目：

内蒙古自治区科技计划项目（2021GG0266）

作者简介：周星（1998-），男，硕士研究生 E-mail：15541555629@163.com 通信作者：董瑞峰（1972-），女，博士，教授 E-mail：drfcsp@163.com

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