航空学报 > 2024, Vol. 45 Issue (16): 429692-429692   doi: 10.7527/S1000-6893.2023.29692

GH4169高温合金孔结构的多级凸包旋转冷扩孔挤压强化工艺参数优化

李洪伟1, 雷学林1(), 张成成2, 汤超宗1, 康胜龙1, 陈亚龙2, 程吕一1, 张显程1   

  1. 1.华东理工大学 承压系统与安全教育部重点实验室,上海 200237
    2.中国航发商用航空发动机有限责任公司,上海 201100
  • 收稿日期:2023-10-09 修回日期:2023-11-01 接受日期:2023-11-29 出版日期:2024-08-25 发布日期:2023-12-13
  • 通讯作者: 雷学林 E-mail:xuelinlei@ecust.edu.cn
  • 基金资助:
    国家重点研发计划(2018YFA0703300);中国航发商用航空发动机有限责任公司联合创新项目二期(HT-3RJC1053-2020)

Optimization of process parameters for multi⁃annular convex hull rotating cold expansion and extrusion reinforcement of GH4169 high⁃temperature alloy hole structures

Hongwei LI1, Xuelin LEI1(), Chengcheng ZHANG2, Chaozong TANG1, Shenglong KANG1, Yalong CHEN2, Lyuyi CHENG1, Xiancheng ZHANG1   

  1. 1.Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China
    2.AECC Commercial Aircraft Engine Co. ,Ltd,Shanghai 201100,China
  • Received:2023-10-09 Revised:2023-11-01 Accepted:2023-11-29 Online:2024-08-25 Published:2023-12-13
  • Contact: Xuelin LEI E-mail:xuelinlei@ecust.edu.cn
  • Supported by:
    National Key Research and Development Project of China(2018YFA0703300);Innovation Program Phase II of AECC Commercial Aircraft Engine Co. Ltd(HT-3RJC1053-2020)

摘要:

提出了一种高温合金含孔结构的新型冷挤压强化工艺,即多级凸包旋转冷扩孔挤压工艺(MCR-CEP),以提升镍基高温合金孔结构件疲劳寿命。为了最大程度地提升MCR-CEP工艺的强化效果,通过多次挤压强化试验,探究凸包间距、主轴转速和挤压量3类工艺参量对强化后孔内壁表面完整性的影响规律。试验结果表明:凸包间距和主轴转速越大,加工过程的挤压力越小;较大的挤压量易造成孔内壁粗糙度增加和残余应力饱和。综合考虑加工过程挤压力、显微硬度、表面粗糙度和残余应力情况,初步确定最优挤压参数为挤压工具凸包间距0.8 mm、主轴转速100 r/min、挤压量0.2 mm。随后,通过疲劳试验对优化工艺的强化效果进行验证。结果显示:与未强化孔结构相比,MCR-CEP强化试样的平均疲劳寿命提升至少118%,最优工艺参数加工的试样疲劳寿命提升达173%。

关键词: 孔挤压强化, 表面完整性, GH4169, 正交试验, 疲劳寿命

Abstract:

This paper proposes a new cold extrusion reinforcement process for high-temperature alloys structures with holes, the Multi-annular Convex Hull Rotating Cold Expansion Process (MCR-CEP) to improve the fatigue life of nickel-based superalloys structures with holes. In order to optimize the enhancement effect of the MCR-CEP process, we explore the impact of three process parameters, namely the bump spacing, the spindle speed, and the extrusion volume, on the surface integrity of the inner wall of the strengthened hole through various extrusion tests. Based on the test results, it was determined that the wider the bump spacing and spindle speed are, the smaller the squeezing force is; the larger squeezing volume is likely to cause an increase in the roughness of the inner wall of the hole and the saturation of the residual stress. After taking into account factors such as expansion pressure, microhardness, surface roughness, and residual stress, it has been determined that the optimal expansion parameters are a spacing of 0.8 mm for the expansion tool, a spindle speed of 100 r/min, and an expansion volume of 0.2 mm. Based on the results, it is concluded that compared with the un-strengthened hole structure, the average fatigue life of specimens that underwent the MCR-CEP process showed an improvement of at least 118%, and the fatigue life of specimens processed with the optimal process parameters increased by 173%.

Key words: hole expansion, surface integrity, GH4169, orthogonal test, fatigue life

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