The Effect of Milling Cooling Conditions on the Surface Integrity and Fatigue Behavior of the GH4169 Superalloy
Abstract
:1. Introduction
2. Experimental
2.1. Materials
2.2. Conditions and Process of Milling Experiment
3. Results and Discussion
3.1. Surface Roughness and Topography
3.2. Surface Microhardness Rate
3.3. Surface Residual Stress
3.4. Microstructure
3.5. Fatigue Behavior
4. Conclusions
- Cooling conditions have a direct impact on the surface integrity of the milled GH4169 superalloy. Microdefects formed by adherent chips of surface topography on the dry milling surface are the main reason that the fatigue behavior of specimens of the GH4169 superalloy of dry milling is lower than that with wet milling.
- In the case of side milling, surface roughness along the fatigue loading direction has no significant impact on the fatigue behavior of specimens of the GH4169 superalloy after wet milling and dry milling. The improvement in residual surface tensile stress is the predominant factor in the fatigue behavior of the GH4169 superalloy specimens, with wet milling slightly decreasing while specimens’ fatigue behavior utilizing dry milling is mainly influenced by surface micro defects and adherent chips of surface topography. A minor factor in the fatigue behavior of dry milling is the increase in surface residual stress and the decrease in the surface microhardness rate.
- Compared with wet milling, the process of dry milling has little impact on surface roughness and the depth of the plastic deformation layer. However, it can lead to an increase in the residual surface tensile stress and a decrease in the surface microhardness rate, and produce surface micro defects and adherent chips of surface topography.
- With the increase in tool flank wear, the surface integrity of wet milling and dry milling follows the same trend, by which surface roughness increases, the surface microhardness rate experiences little change, the residual surface tensile stress rises immensely, and the depth of the plastic deformation layer increases significantly.
Author Contributions
Funding
Conflicts of Interest
References
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C | Nb | Si | Mn | Cr | Ti | Al | Mo | Ni | Cu | Co | Fe |
---|---|---|---|---|---|---|---|---|---|---|---|
0.08 | 4.75–5.5 | 0.35 | 0.35 | 17–20 | 0.75–1.15 | 0.3–0.7 | 2.8–3.3 | 50–55 | 0.3 | 1.0 | Balance |
Tensile Strength /MPa | Elastic Modulus/GPa | Elongation/% | Hardness/HV | Thermal Conductivity/(W/m·°C) | Shrinkage/% |
---|---|---|---|---|---|
1280 | 205 | 15 | 423 | 14.65 | 41 |
Number | Cooling Conditions | VB/mm | vs/(m/min) | fz/(mm/z) | ae/mm |
---|---|---|---|---|---|
1 | Wet milling | 0.05 | 20 | 0.10 | 0.1 |
2 | 0.20 | ||||
3 | Dry milling | 0.05 | |||
4 | 0.20 |
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Xu, R.; Zhou, Y.; Li, X.; Yang, S.; Han, K.; Wang, S. The Effect of Milling Cooling Conditions on the Surface Integrity and Fatigue Behavior of the GH4169 Superalloy. Metals 2019, 9, 1179. https://doi.org/10.3390/met9111179
Xu R, Zhou Y, Li X, Yang S, Han K, Wang S. The Effect of Milling Cooling Conditions on the Surface Integrity and Fatigue Behavior of the GH4169 Superalloy. Metals. 2019; 9(11):1179. https://doi.org/10.3390/met9111179
Chicago/Turabian StyleXu, Rufeng, Yongxin Zhou, Xun Li, Shenliang Yang, Kangning Han, and Shijun Wang. 2019. "The Effect of Milling Cooling Conditions on the Surface Integrity and Fatigue Behavior of the GH4169 Superalloy" Metals 9, no. 11: 1179. https://doi.org/10.3390/met9111179