晶粒尺寸对GH4720Li镍基合金650 ℃拉伸性能的影响

doi:10.13251/j.issn.0254-6051.2025.01.031

金属热处理 ›› 2025, Vol. 50 ›› Issue (1): 201-205.DOI: 10.13251/j.issn.0254-6051.2025.01.031

晶粒尺寸对GH4720Li镍基合金650 ℃拉伸性能的影响

郭婧¹, 温晓灿^2,3, 王强¹, 何歆⁴, 吕少敏^2,3, 谢兴飞^2,3, 曲敬龙^2,3, 杜金辉^2,3

1.中国航发湖南动力机械研究所, 湖南株洲 412002;
2.北京钢研高纳科技股份有限公司, 北京 100081;
3.四川钢研高纳锻造有限责任公司, 四川德阳 618099;
4.中国民用航空适航审定中心, 北京 100102

收稿日期:2024-07-15 修回日期:2024-10-23 出版日期:2025-01-25 发布日期:2025-03-12
作者简介:郭婧(1987—),女,高级工程师,硕士,主要研究方向为金属材料及工艺应用,E-mail:guojing20040510@126.com
基金资助:
国家科技重大专项(J2019-VIII-0002-0163)

Effect of grain size on 650 ℃ tensile properties of GH4720Li nickel-based alloy

Guo Jing¹, Wen Xiaocan^2,3, Wang Qiang¹, He Xin⁴, Lü Shaomin^2,3, Xie Xingfei^2,3, Qu Jinglong^2,3, Du Jinhui^2,3

1. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou Hunan 412002, China;
2. Beijing GAONA Materials & Technology Co., Ltd., Beijing 100081, China;
3. Sichuan CISRI-Gaona Forging Co., Ltd., Deyang Sichuan 618099, China;
4. CAAC Airworthiness Certification Center, Beijing 100102, China

Received:2024-07-15 Revised:2024-10-23 Online:2025-01-25 Published:2025-03-12

摘要/Abstract

摘要： 对GH4720Li合金棒材进行不同温度(1100、1090、1080和1070 ℃)固溶处理,得到4种不同组织形态(平均晶粒尺寸分别为24、18、15和3~5 μm)合金,研究了晶粒尺寸对合金650 ℃高温拉伸性能的影响。结果表明,随晶粒尺寸的减小,GH4720Li合金650 ℃强度增加,同时伴随塑性的降低;当晶粒尺寸进一步降低到3~5 μm时,塑性开始增加,此时合金具有最优的650 ℃综合拉伸性能。这归因于一次γ′强化相对晶界的钉扎作用,获得细小晶粒组织,不仅提供大量晶界,提高强度,同时可以分散塑性变形,降低应力集中,改善塑性。同时适量二次和三次γ′强化相可进一步保证合金的强度。

关键词: GH4720Li镍基合金, 显微组织, 晶粒尺寸, 高温拉伸性能

Abstract: GH4720Li alloy bars were solid solution treated at different temperatures of 1100, 1090, 1080, and 1070 ℃ to obtain four different microstructure with average grain sizes of 24, 18, 15 and 3-5 μm, respectively. The effect of grain size on the high-temperature tensile properties of the alloy at 650 ℃ was investigated. The results show that with the reduction of grain size, the 650 ℃ strength of the GH4720Li alloy increases, accompanied by a decrease in plasticity. When the grain size is further reduced to 3-5 μm, the plasticity begins to increase, and at this time, the alloy exhibits the optimal comprehensive tensile properties at 650 ℃. This is attributed to the pinning effect of primary γ′ strengthening relative to grain boundary, resulting in a fine grain structure that not only provides a large number of grain boundaries and improves strength, but also disperses plastic deformation, reduces stress concentration, and improves plasticity. Simultaneously, an appropriate amount of secondary and tertiary γ′ strengthen phase can further ensure the strength of the alloy.

Key words: GH4720Li nickel-based alloy, microstructure, grain size, high temperature tensile properties

中图分类号:

TG132.3⁺2

郭婧, 温晓灿, 王强, 何歆, 吕少敏, 谢兴飞, 曲敬龙, 杜金辉. 晶粒尺寸对GH4720Li镍基合金650 ℃拉伸性能的影响[J]. 金属热处理, 2025, 50(1): 201-205.

Guo Jing, Wen Xiaocan, Wang Qiang, He Xin, Lü Shaomin, Xie Xingfei, Qu Jinglong, Du Jinhui. Effect of grain size on 650 ℃ tensile properties of GH4720Li nickel-based alloy[J]. Heat Treatment of Metals, 2025, 50(1): 201-205.

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晶粒尺寸对GH4720Li镍基合金650 ℃拉伸性能的影响

Effect of grain size on 650 ℃ tensile properties of GH4720Li nickel-based alloy

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