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

doi:10.7527/S1000-6893.2023.29692

Abstract

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

CLC Number:

V261

Hongwei LI, Xuelin LEI, Chengcheng ZHANG, Chaozong TANG, Shenglong KANG, Yalong CHEN, Lyuyi CHENG, Xiancheng ZHANG. Optimization of process parameters for multi⁃annular convex hull rotating cold expansion and extrusion reinforcement of GH4169 high⁃temperature alloy hole structures[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(16): 429692-429692.

Figures/Tables 15

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References 34

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挤压工具序号	起始挤压孔径φ₀/mm	挤压目标孔径φ_G/mm	凸包间距 m₁/mm
1	11.60	11.73	0.2
2	11.70	11.83	0.2
3	11.80	11.93	0.2
4	11.90	12.00	0.2
5	11.60	11.73	0.5
6	11.70	11.83	0.5
7	11.80	11.93	0.5
8	11.90	12.00	0.5
9	11.60	11.73	0.8
10	11.70	11.83	0.8
11	11.80	11.93	0.8
12	11.90	12.00	0.8

试样编号	凸包间距/mm	转速/（r·m^-1）	挤压量/mm	起始孔径/mm	使用的挤压工具序号
MCR-CEP-1	0.2	0	0.1	11.9	4
MCR-CEP-2	0.2	100	0.4	11.6	1、2、3、4
MCR-CEP-3	0.2	200	0.2	11.8	3、4
MCR-CEP-4	0.5	0	0.2	11.8	7、8
MCR-CEP-5	0.5	100	0.1	11.9	8
MCR-CEP-6	0.5	200	0.4	11.6	5、6、7、8
MCR-CEP-7	0.8	0	0.4	11.6	9、10、11、12
MCR-CEP-8	0.8	100	0.2	11.8	11、12
MCR-CEP-9	0.8	200	0.1	11.9	12

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

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