700 ℃长期时效对GH4706合金组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2025.04.016

金属热处理 ›› 2025, Vol. 50 ›› Issue (4): 106-113.DOI: 10.13251/j.issn.0254-6051.2025.04.016

700 ℃长期时效对GH4706合金组织及力学性能的影响

黄嘉良¹, 徐烨玲¹, 侯翔益¹, 王冲², 段然³, 黄烁³, 廉心桐^1,4

1.上海大学材料科学与工程学院, 上海 200444;
2.东北大学材料科学与工程学院, 辽宁沈阳 110004;
3.北京钢研高纳科技股份有限公司, 北京 100081;
4.上海大学(浙江)高端装备基础件材料研究院, 浙江嘉兴 314100

收稿日期:2024-11-04 修回日期:2025-02-11 发布日期:2025-06-13
通讯作者: 廉心桐,副研究员,博士,E-mail:xtlian@shu.edu.cn
作者简介:黄嘉良(2000—),男,硕士,主要研究方向为高温合金组织性能演变,E-mail:shuhjl@shu.edu.cn。
基金资助:
国家重点研发计划(2022YFB3705105)

Effect of long-term aging at 700 ℃ on microstructure and mechanical properties of GH4706 alloy

Huang Jialiang¹, Xu Yeling¹, Hou Xiangyi¹, Wang Chong², Duan Ran³, Huang Shuo³, Lian Xintong^1,4

1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2. School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110004, China;
3. Gaona Aero Material Co., Ltd., Beijing 100081, China;
4. Zhejiang Institute of Advanced Materials, Shanghai University, Jiaxing Zhejiang 314100, China

Received:2024-11-04 Revised:2025-02-11 Published:2025-06-13

摘要/Abstract

摘要： 采用扫描电镜(SEM)、电子背散射衍射(EBSD)以及拉伸测试分析了GH4706合金经700 ℃长期时效后组织变化和力学性能,研究GH4706合金在长期时效中的晶粒异常长大的原因。结果表明:GH4706合金在700 ℃时效5000 h后,晶内γ′相由圆盘状转变为长条状,晶界处长针状η相呈现魏氏体分布,η相尺寸变长导致两侧γ′析出贫化区(PFZ)变宽,弱化晶界,影响合金力学性能;随着时效时间的延长,大角度晶界数量逐渐减少,孪晶数量降低,晶粒通过合并共有孪晶的方式实现粗化和长大。在长期时效过程中,随着时效时间的延长,合金的力学性能呈现出持续下降的趋势。

关键词: GH4706合金, 长期时效, 组织演变, 力学性能

Abstract: Microstructure and mechanical properties of GH4706 alloy after long-term aging at 700 ℃ were analyzed by means of scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and tensile test. The reason for abnormal grain growth of the GH4706 alloy during long-term aging was investigated. The results show that after aging at 700 ℃ for 5000 h, γ ′phase in the GH4706 alloy changes from disk to long strip, and the needle η phase at the grain boundary distributes like Widmanstatten structure. The precipitation free zone on both sides widens and weakens the grain boundary, and affects the mechanical properties of the GH4706 alloy. With the increase of aging time, the number of large angle grain boundaries decreases gradually, the number of twins decreases, and the grains coarsen and grow by merging common twins. In the long-term aging process, the mechanical properties of the alloy show a continuous decreasing trend with the extension of aging time.

Key words: GH4706 alloy, long-term aging, microstructure evolution, mechanical properties

中图分类号:

TG156.92

黄嘉良, 徐烨玲, 侯翔益, 王冲, 段然, 黄烁, 廉心桐. 700 ℃长期时效对GH4706合金组织及力学性能的影响[J]. 金属热处理, 2025, 50(4): 106-113.

Huang Jialiang, Xu Yeling, Hou Xiangyi, Wang Chong, Duan Ran, Huang Shuo, Lian Xintong. Effect of long-term aging at 700 ℃ on microstructure and mechanical properties of GH4706 alloy[J]. Heat Treatment of Metals, 2025, 50(4): 106-113.

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700 ℃长期时效对GH4706合金组织及力学性能的影响

Effect of long-term aging at 700 ℃ on microstructure and mechanical properties of GH4706 alloy

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