<strong>FGH4720Li</strong>粉末高温合金在近服役条件下的组织与力学性能演变规律

doi:10.11900/0412.1961.2023.00188

金属学报

2025, Vol. 61

Issue (6): 826-836 DOI: 10.11900/0412.1961.2023.00188

研究论文

本期目录 | 过刊浏览

FGH4720Li粉末高温合金在近服役条件下的组织与力学性能演变规律

李大禹¹, 姚志浩¹(

), 赵杰¹, 董建新¹, 郭婧², 赵宇²

1 北京科技大学材料科学与工程学院北京 100083
2 中国航发湖南动力机械研究所株洲 412002

Evolution of Microstructure and Mechanical Properties of FGH4720Li P/M Superalloy Under Near-Service Conditions

LI Dayu¹, YAO Zhihao¹(

), ZHAO Jie¹, DONG Jianxin¹, GUO Jing², ZHAO Yu²

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 AECC Hunan Powerplant Research Institute, Zhuzhou 412002, China

引用本文:

李大禹, 姚志浩, 赵杰, 董建新, 郭婧, 赵宇. FGH4720Li粉末高温合金在近服役条件下的组织与力学性能演变规律[J]. 金属学报, 2025, 61(6): 826-836.
Dayu LI, Zhihao YAO, Jie ZHAO, Jianxin DONG, Jing GUO, Yu ZHAO. Evolution of Microstructure and Mechanical Properties of FGH4720Li P/M Superalloy Under Near-Service Conditions[J]. Acta Metall Sin, 2025, 61(6): 826-836.

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摘要:

高温合金服役过程中的热力耦合状态可使组织发生退化，进而影响其力学性能。对FGH4720Li粉末高温合金在近服役状态下的组织与性能演变规律进行研究，可为同类合金用于涡轮盘的制造提供参考。本工作对FGH4720Li粉末高温合金在500 MPa、600和650 ℃下进行500、1000和2000 h持久实验，研究其在持久实验过程中的组织演变规律及在650 ℃持久实验后合金屈服强度的变化规律。结果表明，FGH4720Li粉末高温合金在650 ℃持久实验后屈服强度维持在约1120 MPa，合金中二次γ'相的形貌由椭球状逐渐变为花瓣状最后演变为带圆角的立方状，三次γ'相出现聚合粗化现象。采用高γ'相含量且强化相多模态分布的沉淀强化预测模型计算了持久实验后合金的屈服强度，进一步证明了三次γ'相含量和尺寸的变化是引起合金屈服强度变化的主要原因。

关键词 ：粉末高温合金, 持久实验, 组织演变, 屈服强度

Abstract：

The FGH4720Li superalloy is produced by GH4720Li through the powder metallurgy (P/M) process, a method that effectively addresses the shortcomings of the original alloy production process, such as significant segregation, low alloying levels, and manufacturing difficulties. The P/M method also results in a finer and more uniform microstructure. However, during the service life of superalloys, the thermodynamic conditions can degrade the microstructure, potentially affecting their mechanical properties. There is currently limited research on how the microstructure and properties of FGH4720Li P/M superalloy evolve under near-service conditions. Therefore, it is essential to investigate this evolution to provide valuable insights for the manufacture of turbine disks. In this study, the microstructure evolution of FGH4720Li P/M superalloy and the variations in its yield strength have been examined after subjecting it to stress rupture for 500, 1000, and 2000 h at 600 and 650 ^oC under a stress level of 500 MPa. The results show that the yield strength of FGH4720Li P/M superalloy remains relatively high, at 1120 MPa, after stress rupture at 650 ^oC. Furthermore, the microstructure of FGH4720Li P/M superalloy undergoes a complex transformation during stress rupture. The secondary γ' phase's morphology gradually changes from an ellipsoidal shape to a flowerlike shape and ultimately to a cubic shape with rounded corners. The coarsening in the polymerization growth of tertiary γ' phases is also observed. To understand the changes in yield strength after stress rupture, a precipitation strengthening prediction model specifically designed for high γ' phase content and a multi-mode distribution of γ' phases was utilized. This calculation confirmed that the alteration in the content and size of the tertiary γ' phase is the primary factor responsible for the yield strength changes in the alloy.

Key words： P/M superalloy stress rupture test microstructure evolution yield strength

收稿日期: 2023-04-25

ZTFLH:

TG132.3

基金资助:国家自然科学基金项目(52271087);国家科技重大专项项目(J2017-VI-0017-089)

通讯作者: 姚志浩，zhihaoyao@ustb.edu.cn，主要从事高温合金的研究

Corresponding author: YAO Zhihao, professor, Tel: (010)62332884, E-mail: zhihaoyao@ustb.edu.cn

作者简介: 李大禹，男，1998年生，硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2023.00188 或 https://www.ams.org.cn/CN/Y2025/V61/I6/826

图1 热处理后FGH4720Li合金微观组织的SEM像

图2 FGH4720Li合金经不同条件持久实验后的EBSD像

图3 不同条件持久实验后FGH4720Li合金的晶粒尺寸演变

图4 FGH4720Li合金经不同条件持久实验后二次γ'相的SEM像及粒径分布

图5 FGH4720Li合金经不同条件持久实验后二次γ'相的高倍SEM像

图6 FGH4720Li合金经不同条件持久实验后三次γ'相形貌的SEM像

图7 持久实验过程中FGH4720Li合金晶粒及γ'相形貌演变示意图

图8 FGH4720Li合金经不同条件持久实验后位错形态的TEM明场像

图9 FGH4720Li合金经650 ℃时效和持久实验不同时间后的拉伸性能

表1 FGH4720Li合金持久实验过程中二次γ'相和三次γ'相的平均体积分数及尺寸

表2 屈服强度计算过程中所使用的参数取值[6,7,30,35,41]

图10 理论计算的FGH4720Li合金经650 ℃不同时间持久实验后的屈服强度与实验值的对比

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