金属热处理 ›› 2023, Vol. 48 ›› Issue (12): 194-200.DOI: 10.13251/j.issn.0254-6051.2023.12.033

• 组织与性能 • 上一篇    下一篇

GH4169合金经高温及应力时效处理后的组织演变及性能

崔文明, 王纪兴, 邹佳佳, 张晓辰, 张凯, 梁锡炳, 张瑞, 臧昊良   

  1. 国合通用(青岛)测试评价有限公司, 山东 青岛 266000
  • 收稿日期:2023-08-01 修回日期:2023-11-07 出版日期:2023-12-25 发布日期:2024-01-29
  • 作者简介:崔文明(1985—),女,工程师,硕士,主要研究方向为金属材料检测技术、材料性能评价和失效分析,E-mail: cuiwenming@qd.cutc.net

Microstructure evolution and properties of GH4169 alloy after high temperature and stress aging treatment

Cui Wenming, Wang Jixing, Zou Jiajia, Zhang Xiaochen, Zhang Kai, Liang Xibing, Zhang Rui, Zang Haoliang   

  1. China United Test & Evaluation (Qingdao) Co., Ltd., Qingdao Shandong 266000, China
  • Received:2023-08-01 Revised:2023-11-07 Online:2023-12-25 Published:2024-01-29

摘要: 以GH4169高温合金为研究对象,通过对其进行不同条件下的高温时效以及高温应力时效处理后,进行拉伸和疲劳寿命测试,研究其微观组织演变、剩余强度和疲劳寿命以及其相关机理。结果表明,GH4169合金在550 ℃时效时组织稳定;650 ℃高温时效后γ″相开始出现粗化,在应力作用下发生γ″→δ转变,强度和寿命降低;700 ℃高温时效后晶内γ″相向δ相转变明显,耦合应力进一步促进了相的转变。高温耦合应力的环境下表面发生氧化开裂大大降低了GH4169合金的疲劳寿命。

关键词: GH4169高温合金, 高温时效, 高温应力时效, 显微组织, 表面氧化开裂, 疲劳寿命

Abstract: Taking GH4169 superalloy as the research object, the microstructure evolution, residual strength and fatigue life and the relevant mechanisms were studied through tensile and fatigue test after high-temperature aging and high-temperature coupled stress aging treatment under different conditions. The results show that the structure of the GH4169 alloy is stable when aged at 550 ℃, and after high temperature aging at 650 ℃, the γ″ phase begins to coarsen and the γ″→δ transformation occurs under the action of stress, the strength and lifetime are reduced. After high temperature aging at 700 ℃ the γ″→δ phase transformation is obvious, and the coupled stress further promotes the phase transformation. The fatigue life of the GH4169 alloy is greatly reduced by cracking of the surface under the persistent environment of high temperature coupled stress.

Key words: GH4169 superalloy, high temperature aging, high temperature stress aging, microstructure, surface oxidation cracking, fatigue life

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