An Investigation of the Work Hardening Behavior in Interrupted Cutting Inconel 718 under Cryogenic Conditions
Abstract
:1. Introduction
2. Experiment and Simulation Setup
2.1. Experimental Setup
2.2. Measurement and Analysis
2.3. Simulations with FEM
3. Results and Discussion
3.1. Depth of Work Hardening
3.2. Yield Strength
3.3. Degree of Work Hardening
4. Conclusions
- The microhardness on the machined surface is significantly higher than the bulk material for the deformation that occurs during cutting processes. The cryogenic assisted technology used in turning processes enhances the parts’ surface integrity in turning Inconel 718. Higher surface hardness can be obtained by cooling the cutting zone rather than precooling the bulk material. In contrast, dry machining trends to generate softer and rougher surfaces for the lack of coolant than assisted machining technologies.
- The cooling condition has significant influence on the machine-affected zone (MAZ) and degree of work hardening (DWH). The depth of work hardening layer maintains at about 60 μm without coolant, about 70 μm with the pre cooling by liquid nitrogen while reaches about 80 μm with the liquid nitrogen cooling the cutting zone.
- The surface yield strength of workpiece is predicted by Meyer’s law with the measured microhardness, as well as the indentation diagonal length. The yield strength of the surface with liquid nitrogen cooling is larger than that of dry cutting from this investigation, which enhanced the function performance of the components.
Author Contributions
Funding
Conflicts of Interest
References
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C | Mn | Si | P | Ni | Cr | Mo | Ti | Nb | Co | B | Al | Fe |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.03 | 0.02 | 0.09 | 0.003 | 52.48 | 18.94 | 3.03 | 0.98 | 5.13 | 0.02 | 0.003 | 0.51 | other |
No. | Cooling Method | Cutting Speed (m/min) |
---|---|---|
1 | Dry | 40 |
2 | 60 | |
3 | 80 | |
4 | Cryogenic (pre-cooling workpiece) | 40 |
5 | 60 | |
6 | 80 | |
7 | Cryogenic (cooling cutting zone) | 40 |
8 | 60 | |
9 | 80 |
Sample | Diagonal Length at Different Loads (μm) | m | R2 | |||
---|---|---|---|---|---|---|
20 g | 50 g | 100 g | 200 g | |||
1 | 9.28 | 14.47 | 18.17 | 25.76 | 2.293 | 0.9947 |
2 | 8.95 | 14.57 | 18.31 | 24.18 | 2.326 | 0.9895 |
3 | 9.12 | 14.78 | 17.99 | 25.11 | 2.310 | 0.9886 |
4 | 9.43 | 13.46 | 16.98 | 25.59 | 2.332 | 0.9854 |
5 | 9.08 | 14.39 | 18.51 | 24.55 | 2.325 | 0.9948 |
6 | 9.01 | 14.37 | 17.29 | 24.19 | 2.374 | 0.9879 |
7 | 8.96 | 14.18 | 16.98 | 23.77 | 2.405 | 0.9876 |
8 | 9.02 | 15.13 | 17.25 | 24.38 | 2.351 | 0.9715 |
9 | 8.89 | 14.79 | 17.93 | 23.09 | 2.406 | 0.9775 |
Sample | Depth | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
---|---|---|---|---|---|---|---|---|---|---|
DWH (%) | 30 μm | 26.77 | 22.77 | 24.25 | 31.41 | 28.46 | 19.59 | 33.82 | 27.62 | 25.72 |
DWH (%) | 50 μm | 8.51 | 6.76 | 6.79 | 15.22 | 10.30 | 6.3 | 15.26 | 14.90 | 10.91 |
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Dai, X.; Zhuang, K.; Pu, D.; Zhang, W.; Ding, H. An Investigation of the Work Hardening Behavior in Interrupted Cutting Inconel 718 under Cryogenic Conditions. Materials 2020, 13, 2202. https://doi.org/10.3390/ma13092202
Dai X, Zhuang K, Pu D, Zhang W, Ding H. An Investigation of the Work Hardening Behavior in Interrupted Cutting Inconel 718 under Cryogenic Conditions. Materials. 2020; 13(9):2202. https://doi.org/10.3390/ma13092202
Chicago/Turabian StyleDai, Xing, Kejia Zhuang, Donglin Pu, Weiwei Zhang, and Han Ding. 2020. "An Investigation of the Work Hardening Behavior in Interrupted Cutting Inconel 718 under Cryogenic Conditions" Materials 13, no. 9: 2202. https://doi.org/10.3390/ma13092202