一种<strong>6Re/3Ru</strong>镍基单晶高温合金微观组织的稳定性和高温持久性能

doi:10.11901/1005.3093.2022.524

材料研究学报

2023, Vol. 37

Issue (10): 721-730 DOI: 10.11901/1005.3093.2022.524

研究论文

本期目录 | 过刊浏览

一种6Re/3Ru镍基单晶高温合金微观组织的稳定性和高温持久性能

陈瑞志¹, 刘丽荣¹(

), 郭圣东¹, 张迈², 卢广先², 李远², 赵云松², 张剑²

^1.沈阳工业大学材料科学与工程学院沈阳 110870
^2.中国航发北京航空材料研究院先进高温结构材料重点实验室北京 100095

Microstructural Stability and Stress Rupture Property of a 6Re/3Ru Containing Nickel-based Single Crystal Superalloy

CHEN Ruizhi¹, LIU Lirong¹(

), GUO Shengdong¹, ZHANG Mai², LU Guangxian², LI Yuan², ZHAO Yunsong², ZHANG Jian²

^1.School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Science and Technology on Advanced High Temperature Structural Material Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

引用本文:

陈瑞志, 刘丽荣, 郭圣东, 张迈, 卢广先, 李远, 赵云松, 张剑. 一种6Re/3Ru镍基单晶高温合金微观组织的稳定性和高温持久性能[J]. 材料研究学报, 2023, 37(10): 721-730.
Ruizhi CHEN, Lirong LIU, Shengdong GUO, Mai ZHANG, Guangxian LU, Yuan LI, Yunsong ZHAO, Jian ZHANG. Microstructural Stability and Stress Rupture Property of a 6Re/3Ru Containing Nickel-based Single Crystal Superalloy[J]. Chinese Journal of Materials Research, 2023, 37(10): 721-730.

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摘要:

用场发射扫描电镜(FE-SEM)和透射电镜(TEM)观察一种第四代镍基单晶高温合金长期时效和持久断裂后的微观组织和位错组态，研究了这种合金在1000℃和1130℃长期时效过程中的组织演化和在1100℃/140 MPa条件下的持久性能。结果表明：这种合金具有较好的组织稳定性，在1000℃长期时效过程中γ'相逐渐长大，但是在1000 h后仍有较好的立方度且没有TCP相析出。在1130℃长期时效500 h后γ'相发生连接和筏化；时效200 h后开始析出TCP相，时效1000 h后合金中TCP相的面积分数只有0.04%。在1130℃长期时效500 h后，γ/γ'界面形成位错网并随着时效时间的延长变得更加规则致密。这种合金在1100℃/140 MPa条件下的持久寿命为676.5 h，达到第四代镍基单晶高温合金水平。持久断裂后γ'相发生N型筏化，合金中析出针状TCP相(μ相)并在TCP相附近出现位错塞积。在持久试验过程中，合金中生成的γ/γ'界面位错网和a<010>超位错有利于提高其持久性能。

关键词 ：金属材料, 第四代镍基单晶高温合金, 长期时效, 持久性能, 界面位错网, TCP相

Abstract：

The microstructural evolution during long-term aging at 1000℃ and 1130℃ and the stress rupture property at 1100℃/140 MPa of a fourth-generation nickel-based single crystal superalloy with 6Re/3Ru were investigated. The microstructure and dislocation configuration of the alloy were observed by field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) in terms of its microstructural stability and stress rupture property. The results showed that the alloy displayed excellent microstructural stability. During long-term aging at 1000℃, γ′ phase grew up gradually, but γ′ phase still remained high cubic degree, however, the TCP phases did not precipitate after aging for 1000 h. After aging at 1130℃ for 500 h, the γ′ phase connected each other and became rafting ed. The TCP phase started to precipitate after long-term aging at 1130℃ for 200 h, however, the content of TCP phase was only 0.04% after aging for 1000 h in the alloy. After aging at 1130℃ for 500 h, dislocation networks formed at γ/γ′ interfaces which became more regular and denser with the increase of aging time. The stress rupture life of the alloy at 1100℃/140 MPa was 676.5 h, which reached the level of the fourth-generation nickel-based single crystal superalloy. The γ′ phase underwent N-type rafting, the needle-like TCP phase (μ phase) precipitated, and dislocation pile-up was found near TCP phase after fracture. During stress rupture test, the formation of γ/γ′ interfacial dislocation networks and a<010> super-dislocations in the alloy was beneficial to the stress rupture property.

Key words： metallic materials 4^th generation nickel-based single crystal superalloy long-term aging stress rupture property interfacial dislocation networks TCP phase

收稿日期: 2022-09-29

ZTFLH:

TG132.3

基金资助:国家自然科学基金(52001297);辽宁省自然科学基金(2020-MS-212)

通讯作者: 刘丽荣，教授，lrliu@sut.edu.cn，研究方向为高温合金的组织与力学性能

Corresponding author: LIU Lirong, Tel: 18642002619, E-mail: lrliu@sut.edu.cn

作者简介: 陈瑞志，男，2000年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.524 或 https://www.cjmr.org/CN/Y2023/V37/I10/721

图1 持久试样和持久断裂试样观察区域的示意图

图2 完全热处理后合金的SEM形貌、 TEM形貌及衍射花样

图3 在1000℃和1130℃长期时效不同时间后γ′相的形貌(a) (f) 50 h; (b) (g) 100 h; (c) (h) 200 h; (d) (i) 500 h; (e) (j) 1000 h

图4 在1000℃和1130℃长期时效不同时间后γ′相的平均尺寸、体积分数和粗化速率

图5 合金在1000℃和1130℃长期时效不同时间后析出的TCP相

表1 用SEM-EDS测量的1130℃长期时效不同时间后的TCP成分

图6 在1130℃长期时效不同时间后γ/γ′界面位错网和位错间距统计

图7 断裂试样不同区域的γ/γ′形貌和TCP相

图8 断裂试样中TCP相的形貌和选区电子衍射花样

表2 用SEM-EDS能谱测量的断裂试样中μ相的成分

图9 在1100℃/140 MPa条件下持久断裂后合金中的位错组态

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