两步固溶对Inconel 718合金组织和δ相析出的影响

刘恩宇; 马庆爽; 李心童; 高傲雪; 白静; 余黎明; 高秋志; 李会军

doi:10.1007/s12613-024-2887-7

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Oct. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(10): 2199-2207

Enyu Liu, Qingshuang Ma, Xintong Li, Aoxue Gao, Jing Bai, Liming Yu, Qiuzhi Gao, and Huijun Li, Effect of two-step solid solution on microstructure and δ phase precipitation of Inconel 718 alloy, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2199-2207. https://doi.org/10.1007/s12613-024-2887-7

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Enyu Liu, Qingshuang Ma, Xintong Li, Aoxue Gao, Jing Bai, Liming Yu, Qiuzhi Gao, and Huijun Li, Effect of two-step solid solution on microstructure and δ phase precipitation of Inconel 718 alloy, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2199-2207. https://doi.org/10.1007/s12613-024-2887-7

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研究论文

两步固溶对Inconel 718合金组织和δ相析出的影响

1)
东北大学材料科学与工程学院, 沈阳 110819, 中国
2)
东北大学秦皇岛分校资源与材料学院, 秦皇岛 066004, 中国
3)
天津大学材料科学与工程学院, 天津 300354, 中国
4)
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia

* 共同第一作者

通讯作者:
高秋志 E-mail: neuqgao@163.com

李会军 E-mail: huijun@uow.edu.au

文章亮点

(1) 通过改变第二步固溶温度，研究了两步固溶处理对δ相和微观结构的影响。

(2) 通过层错切过理论解释了γ″–δ转变机理。

(3) 在晶界处采用短棒状δ相可以有效钉扎晶界，提高Inconel 718合金的硬度。

中文摘要

Inconel 718合金是目前最受欢迎的镍基高温合金，因其卓越的热机械性能，在航空航天、汽车和能源工业中得到了广泛的应用。以锻造态的Inconel 718合金棒材为研究对象，采用X射线衍射、扫描电子显微镜和透射电子显微镜等表征手段与硬度测试研究了该合金经两步固溶加双级时效处理后组织与硬度的变化，重点研究了两步固溶过程中析出相的演变规律，阐述了γ″亚稳相向δ相的转变机理。通过XRD相分析及Image Pro图像分析软件分别对析出相进行分析，结果表明，随着第二步固溶温度的升高，δ相含量呈先升高后降低的趋势。通过扫描电子显微镜和透射电子显微镜研究了微观结构和δ相的变化，在第二步固溶温度为925°C的样品中发现了晶内δ相，其与γ基体的取向关系为${[\bar 100]_{\text δ} }$//${[01\bar 1]_{\text γ} }$与(010)_δ//(111)_γ，通过层错切过理论解释了这种晶内δ相的形成，即γ″亚稳相向δ相的转变过程。通过维氏硬度计对各热处理状态的Inconel 718合金进行硬度测试，研究了析出相含量变化对硬度的影响，第二步固溶处理温度在1010°C时样品硬度最高，最大硬度为HV 446.84。

关键词:

Research Article

Effect of two-step solid solution on microstructure and δ phase precipitation of Inconel 718 alloy

+ Author Affiliations

1)
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2)
School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China
3)
School of Materials Science & Engineering, Tianjin University, Tianjin 300354, China
4)
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
*These authors contributed equally to this work.

Corresponding authors:
Qiuzhi Gao E-mail: neuqgao@163.com

Huijun Li E-mail: huijun@uow.edu.au
Received: 23 January 2024; Revised: 6 March 2024; Accepted: 20 March 2024; Available online: 21 March 2024

Abstract

Abstract

Inconel 718 is the most popular nickel-based superalloy and is extensively used in aerospace, automotive, and energy industries owing to its extraordinary thermomechanical properties. The effects of different two-step solid solution treatments on microstructure and δ phase precipitation of Inconel 718 alloy were studied, and the transformation mechanism from γ″ metastable phase to δ phase was clarified. The precipitates were statistically analyzed by X-ray diffractometry. The results show that the δ phase content firstly increased, and then decreased with the temperature of the second-step solid solution. The changes in microstructure and δ phase were studied by scanning electron microscopy and transmission electron microscopy. An intragranular δ phase formed in Inconel 718 alloy at the second-step solid solution temperature of 925°C, and its orientation relationship with γ matrix was determined as ${[\bar 100]_{\text δ} }$//${[01\bar 1]_{\text γ} }$ and (010)_δ//(111)_γ. Furthermore, the Vickers hardness of different heat treatment samples was measured, and the sample treated by second-step solid solution at 1010°C reached the maximum hardness of HV 446.84.
- Inconel 718 alloy;
- two-step solid solution treatment;
- δ phase;
- γ″–δ transformation

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