Effects of Machined Surface Integrity on High-Temperature Low-Cycle Fatigue Life and Process Parameters Optimization of Turning Superalloy Inconel 718
Abstract
:1. Introduction
2. Effects of Surface Integrity Characterization Parameters on Fatigue Life
3. Experiments
4. Results and Discussions
4.1. Low-Cycle Fatigue Life and Fracture Morphology
4.2. Effects of Surface Integrity on High-Temperature Low-Cycle Fatigue Life
4.2.1. Effects of Residual Stress on Low-Cycle Fatigue Life
4.2.2. Effects of Degree of Work Hardening on Low-Cycle Fatigue Life
4.2.3. Effects of Grain Refinement on Low-Cycle Fatigue Life
4.2.4. Effects of Surface Fatigue Stress Concentration Coefficient on Low-Cycle Fatigue Life
4.3. Optimization of Inconel 718 Antifatigue Turning Process Parameters
5. Conclusions
- (1)
- The fatigue crack growth area occupied most of the fracture area. The fatigue instantaneous failure zone was characterized by dimple fracture. The transient region had an uneven rough surface and a shear lip feature. Fatigue cracks on high-temperature fractures showed obvious multipoint origin characteristics. In addition, the multisource characteristics of high-temperature fatigue fracture showed the effects of temperature on the fracture strength of the machined metamorphic layer.
- (2)
- With the increase in the surface residual stress S22, the fatigue life decreased at three different feed rates. The fatigue life displayed an increasing trend with the surface residual stress S33 increasing at the feed rates f = 0.10 mm/rev and f = 0.15 mm/rev, but presented a decreasing trend at the feed rate f = 0.20 mm/rev. The low-cycle fatigue life showed the different degrees of decreasing trend as the degree of work hardening of the machined surface increased. The low-cycle fatigue life showed an increasing trend with the increase in the surface grain refinement and presented a decreasing trend with the increase in the fatigue stress concentration coefficient.
- (3)
- The order of the characterization parameters of machined surface integrity on the high-temperature low-cycle fatigue life was the degree of work hardening RHV, the residual stress in the cutting speed direction S22, the fatigue stress concentration factor Kf, the degree of grain refinement RD and the residual stress in the feed direction S33.
- (4)
- In the range of turning parameters of this experiment, the cutting speeds should be 80~110 m/min, and the feed rate should be 0.10~0.12 mm/rev to obtain higher high-temperature low-cycle fatigue life.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Specimens No. | Turning Process Parameters | Surface Integrity Indicators | Low-Cycle Fatigue Life | ||||||
---|---|---|---|---|---|---|---|---|---|
v (m/min) | f (mm/rev) | ap (mm) | Kf | S22 (MPa) | S33 (MPa) | RHV | RD (mm) | Ngf (× 102) | |
1 | 50 | 0.10 | 0.20 | 1.196 | 698 | 968.0 | 1.189 | 1.04 | 1.420 |
2 | 50 | 0.15 | 0.20 | 1.166 | 845 | 1301.0 | 1.179 | 1.19 | 1.330 |
3 | 50 | 0.20 | 0.20 | 1.362 | 897 | 1599.0 | 1.224 | 1.47 | 1.270 |
4 | 70 | 0.10 | 0.20 | 1.179 | 631 | 924.0 | 1.179 | 1.44 | 2.090 |
5 | 70 | 0.15 | 0.20 | 1.241 | 827 | 1291.0 | 1.171 | 1.69 | 1.850 |
6 | 70 | 0.20 | 0.20 | 1.422 | 840.5 | 1574.0 | 1.192 | 1.80 | 1.930 |
7 | 90 | 0.10 | 0.20 | 1.121 | 678.4 | 1219.7 | 1.163 | 1.56 | 2.380 |
8 | 90 | 0.15 | 0.20 | 1.135 | 855 | 1585.6 | 1.211 | 1.83 | 1.810 |
9 | 90 | 0.20 | 0.20 | 1.533 | 1090.9 | 1764.3 | 1.244 | 2.04 | 1.120 |
10 | 110 | 0.10 | 0.20 | 1.119 | 620.1 | 849.0 | 1.158 | 1.56 | 2.040 |
11 | 110 | 0.15 | 0.20 | 1.211 | 1148.5 | 1244.4 | 1.213 | 1.86 | 1.220 |
12 | 110 | 0.20 | 0.20 | 1.567 | 1150.7 | 1953.1 | 1.224 | 2.12 | 1.510 |
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Ren, X.; Liu, Z.; Liang, X.; Cui, P. Effects of Machined Surface Integrity on High-Temperature Low-Cycle Fatigue Life and Process Parameters Optimization of Turning Superalloy Inconel 718. Materials 2021, 14, 2428. https://doi.org/10.3390/ma14092428
Ren X, Liu Z, Liang X, Cui P. Effects of Machined Surface Integrity on High-Temperature Low-Cycle Fatigue Life and Process Parameters Optimization of Turning Superalloy Inconel 718. Materials. 2021; 14(9):2428. https://doi.org/10.3390/ma14092428
Chicago/Turabian StyleRen, Xiaoping, Zhanqiang Liu, Xiaoliang Liang, and Pengcheng Cui. 2021. "Effects of Machined Surface Integrity on High-Temperature Low-Cycle Fatigue Life and Process Parameters Optimization of Turning Superalloy Inconel 718" Materials 14, no. 9: 2428. https://doi.org/10.3390/ma14092428