Effects of TiAlN Coating Thickness on Machined Surface Roughness, Surface Residual Stresses, and Fatigue Life in Turning Inconel 718
Abstract
:1. Introduction
2. Workpiece and Tool Materials
2.1. Workpiece of Inconel 718
2.2. Cutting Tools with Various Coating Thicknesses
3. Design of Experiments
3.1. Turning Tests
3.2. Detection and Characterization
4. Results and Discussion
4.1. Measured Cutting Force
4.2. Machined Surface Roughness
4.3. Machined Surface Residual Stress
4.4. Fatigue Life of Machined Inconel 718
5. Conclusions
- (1)
- The deposited TiAlN coatings with various coating thicknesses improved the tool-chip contact friction characteristics in wet turning Inconel 718 compared to that by uncoated tools. The resultant forces F∑ in wet turning Inconel 718 by TiAlN tools with thicker coating thicknesses (2 μm, 2.5 μm, 3 μm) were increased 11.39 N (8.37%), 19.11 N (14.04%), 34.49 N (25.33%) compared to that by TiAlN tool with thin coating thickness 1.6 μm.
- (2)
- The surface roughness Sa value of machined Inconel 718 by TiAlN tools with coating thickness 1.6 μm was decreased about 22.64% compared to that by uncoated tool. The surface roughness Sa value of machined Inconel 718 by TiAlN tool with coating thickness 3 μm was linearly increased 48.32% compared to that with coating thickness 1.6 μm. The thinner TiAlN tools (1.6 μm) could help to improve the surface roughness of machined parts of Inconel 718.
- (3)
- The machined surface residual stresses in the directions of cutting speed and feed rate were decreased linearly 148.67% and decreased exponentially 92.24% for the machined Inconel 718 with TiAlN tools when the coating thickness was increased from 0 μm to 3 μm, respectively.
- (4)
- The low cycle fatigue life of machined Inconel 718 with TiAlN tool was increased linearly 15.60% when the coating thickness increased from 0 μm to 3 μm. The improvement of surface residual stress was the main conducive factors for the improvement of fatigue performance compared to the limited effects of surface roughness on fatigue performance after machining Inconel 718 with TiAlN tools. The thicker TiAlN tools (3 μm) improved the low cycle fatigue life of machined parts of Inconel 718 compared to the other tools. The suitable selection of TiAlN coating thickness should depend on the service conditions of machined parts.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Properties | Tensile Strength | Proof Strength, Plastic Extension | Percentage Elongation after Fracture | Percentage Reduction in Area | Hardness |
---|---|---|---|---|---|
Values | 1504 MPa | 1247 MPa | 19.5% | 32% | 439 HBW |
Properties | 20 °C | 200 °C | 400 °C | 600 °C | 800 °C | 1000 °C |
---|---|---|---|---|---|---|
Density (kg/m3) | 8240 | - | - | - | - | - |
Young’s modulus (GPa) | 199.9 | - | - | - | - | - |
Poisson’s ratio | 0.3 | - | - | - | - | - |
Thermal conductivity (W/(m·K)) | 13.4 | 15.9 | 18.3 | 21.2 | 23.6 | 30.4 |
Specific heat (J/(kg·K)) | 435 | 460.4 | 493.9 | 539 | 615.3 | 707.4 |
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Jiang, A.; Zhao, J.; Cui, P.; Liu, Z.; Wang, B. Effects of TiAlN Coating Thickness on Machined Surface Roughness, Surface Residual Stresses, and Fatigue Life in Turning Inconel 718. Metals 2024, 14, 940. https://doi.org/10.3390/met14080940
Jiang A, Zhao J, Cui P, Liu Z, Wang B. Effects of TiAlN Coating Thickness on Machined Surface Roughness, Surface Residual Stresses, and Fatigue Life in Turning Inconel 718. Metals. 2024; 14(8):940. https://doi.org/10.3390/met14080940
Chicago/Turabian StyleJiang, Aisheng, Jinfu Zhao, Pengcheng Cui, Zhanqiang Liu, and Bing Wang. 2024. "Effects of TiAlN Coating Thickness on Machined Surface Roughness, Surface Residual Stresses, and Fatigue Life in Turning Inconel 718" Metals 14, no. 8: 940. https://doi.org/10.3390/met14080940