热处理对新型镍钴基高温合金组织及硬度的影响

doi:10.13251/j.issn.0254-6051.2023.05.031

金属热处理 ›› 2023, Vol. 48 ›› Issue (5): 204-209.DOI: 10.13251/j.issn.0254-6051.2023.05.031

热处理对新型镍钴基高温合金组织及硬度的影响

胡嘉豪, 高佳利, 张尚洲

烟台大学精准材料高等研究院, 山东烟台 264005

收稿日期:2023-02-15 修回日期:2023-03-27 出版日期:2023-05-25 发布日期:2023-06-21
通讯作者: 张尚洲,教授,博士,E-mail: szzhang@ytu.edu.cn
作者简介:胡嘉豪(1997—),男,硕士研究生,主要研究方向为新型镍基高温合金的组织及力学性能,E-mail: hjh09251026@126.com。

Effect of heat treatment on microstructure and hardness of novel Ni-Co based superalloys

Hu Jiahao, Gao Jiali, Zhang Shangzhou

Institute for Advanced Studies in Precision Materials, Yantai University, Yantai Shandong 264005, China

Received:2023-02-15 Revised:2023-03-27 Online:2023-05-25 Published:2023-06-21

摘要/Abstract

摘要： 利用CALPHAD方法设计了3种不同(W+Ta)含量的新型镍钴基高温合金,并根据平衡相图确定合金固溶及时效处理制度。利用OM、SEM以及EDS等手段对新型镍钴基高温合金热处理后的微观组织特征进行了分析。结果表明,3种镍钴基高温合金,铸态组织均由γ相、γ′相、γ+γ′共晶组织及碳化物组成,γ+γ′共晶组织呈放射状。经固溶处理后,铸态一次γ′相完全消除,800 ℃时效后析出三次γ′相。随着时效时间的增加,合金中γ′相尺寸增大,合金的硬度也呈上升趋势,但W+Ta含量高的合金在800 ℃时效析出的γ′相发生了分裂,硬度先增加后减少。

关键词: 镍钴基高温合金, 热处理, 显微组织, γ′相分裂, 硬度

Abstract: Three novel Ni-Co based superalloys with different (W+Ta) contents were designed by using CALPHAD method, and solution and aging treatment of the alloys were determined by the equilibrium phase diagram. The microstructural characteristics of the Ni-Co based superalloys after heat treatment were analysed by means of OM, SEM and EDS. The results show that the as-cast microstructure of the three Ni-Co based superalloys is composed of γ phase, γ′ phase, γ+γ′ eutectic structure and carbides, and the γ+γ′ eutectic structure is radial. After solution treatment, the as-cast primary γ′ phase is completely eliminated, and tertiary γ′ phases are precipitated after aging at 800 ℃. With the increase of aging time, the size of γ′ phase increases, and the hardness of the alloys also increases, however, the precipitated γ′ phases in the alloy with high W+Ta content aged at 800 ℃ are split, that results in hardness increasing first and then decreasing.

Key words: Ni-Co based superalloys, heat treatment, microstructure, γ′ phase splitting, hardness

中图分类号:

TG156.1

胡嘉豪, 高佳利, 张尚洲. 热处理对新型镍钴基高温合金组织及硬度的影响[J]. 金属热处理, 2023, 48(5): 204-209.

Hu Jiahao, Gao Jiali, Zhang Shangzhou. Effect of heat treatment on microstructure and hardness of novel Ni-Co based superalloys[J]. Heat Treatment of Metals, 2023, 48(5): 204-209.

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热处理对新型镍钴基高温合金组织及硬度的影响

Effect of heat treatment on microstructure and hardness of novel Ni-Co based superalloys

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