固溶处理对新型镍钴基高温合金显微组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.04.016

金属热处理 ›› 2023, Vol. 48 ›› Issue (4): 97-103.DOI: 10.13251/j.issn.0254-6051.2023.04.016

固溶处理对新型镍钴基高温合金显微组织及力学性能的影响

程体娟^1,2, 于鸿垚^1,2, 毕中南^2,3, 杜金辉^1,3

1.钢铁研究总院有限公司高温材料研究院, 北京 100081;
2.高温合金新材料北京市重点实验室, 北京 100081;
3.北京钢研高纳科技股份有限公司, 北京 100081

收稿日期:2022-07-27 修回日期:2022-11-25 发布日期:2023-05-27
通讯作者: 于鸿垚, 教授, 博士, E-mail:hongyao21@163.com
作者简介:程体娟(1997—),女,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:chengtijuan@126.com。

Effect of solution treatment on microstructure and mechanical properties of a novel nickel-cobalt-based superalloy

Cheng Tijuan^1,2, Yu Hongyao^1,2, Bi Zhongnan^2,3, Du Jinhui^1,3

1. Research Institute of High Temperature Materials, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China;
2. Beijing Key Laboratory of Advanced High Temperature Materials, Beijing 100081, China;
3. Beijing CISRI-GAONA Materials and Technology Co., Ltd., Beijing 100081, China

Received:2022-07-27 Revised:2022-11-25 Published:2023-05-27

摘要/Abstract

摘要： 采用OM、SEM和拉伸试验等研究了固溶温度和固溶时间对新型镍钴基高温合金组织及力学性能的影响。结果表明,晶粒尺寸变化与一次γ′相含量变化一致,固溶温度低于1110 ℃时,随着固溶温度升高或固溶时间延长,残留的一次γ′相钉扎晶界,晶粒尺寸增加较缓。固溶温度为1110 ℃时,延长固溶时间至4 h时,一次γ′相基本回溶,晶粒尺寸迅速增加,进一步延长固溶时间至6 h时,晶粒尺寸增加减缓,即合金中一次γ′相的全溶温度为1110 ℃。合金在1100 ℃固溶4 h和双级时效处理(670 ℃×24 h, 空冷+780 ℃×16 h, 空冷)后的抗拉强度和屈服强度达到最大值,分别为1584 MPa和1104 MPa。因此,合金的固溶温度宜选取为1100 ℃,固溶时间宜选取为4 h。

关键词: 固溶处理, 新型镍钴基高温合金, 显微组织, 力学性能

Abstract: Effects of solution treatment temperature and time on microstructure and mechanical properties of a novel nickel-cobalt-based superalloy were studied by means of OM, SEM and tensile test. The results show that the evolution of the grain size is consistent with the change of the primary γ′ phase volume fraction. When the solution treatment temperature is below 1110 ℃, the grain size increases slowly with the increase of solution treatment temperature or time due to the grain boundaries pinning effect caused by the residual primary γ′ phase. When the solution treatment temperature is 1110 ℃, the primary γ′ phase is basically redissolved as the solution treatment time increases to 4 h, which results in a rapid increase of grain size. With further extending the solution treatment time to 6 h, the increase of grain size slows down, the temperature for full dissolution of the γ′ phase in the tested alloy is 1110 ℃. In addition, after solution treatment at 1100 ℃ for 4 h and two-stage aging treatment (670 ℃×24 h, air cooling and 780 ℃×16 h, air cooling), the tensile strength and yield strength of the alloy reach the maximum value, 1584 MPa and 1104 MPa, respectively. Thus, the optimal solution treatment of the tested alloy are confirmed as at 1100 ℃ for 4 h, respectively.

Key words: solution treatment, novel nickel-cobalt-based superalloy, microstructure, mechanical properties

中图分类号:

TG156.1

程体娟, 于鸿垚, 毕中南, 杜金辉. 固溶处理对新型镍钴基高温合金显微组织及力学性能的影响[J]. 金属热处理, 2023, 48(4): 97-103.

Cheng Tijuan, Yu Hongyao, Bi Zhongnan, Du Jinhui. Effect of solution treatment on microstructure and mechanical properties of a novel nickel-cobalt-based superalloy[J]. Heat Treatment of Metals, 2023, 48(4): 97-103.

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DOI:10.13251/j.issn.0254-6051.2023.04.017

固溶处理对新型镍钴基高温合金显微组织及力学性能的影响

Effect of solution treatment on microstructure and mechanical properties of a novel nickel-cobalt-based superalloy

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