Surface Nanocrystallization and Numerical Modeling of 316L Stainless Steel during Ultrasonic Shot Peening Process
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Gradient Nano-Grained 316L Stainless Steel
3.2. Simulation Results
4. Discussion
4.1. Grain Refinement
4.2. Validation of the FE Numerical Model
4.3. Parameter Investigations
4.3.1. Ultrasonic Frequency
4.3.2. Working Distance
4.3.3. Ultrasonic Amplitude
4.4. Multiple Impacts and Verification
5. Conclusions
- (a)
- Ultrasonic shot peening technology is an effective method for surface nanocrystallization of 316L stainless steel and the thickness of the nano-grained surface layer increases gradually with the increment of the processing time;
- (b)
- The finite element simulation model can be used to simulate the impact behavior of the shot, stress, and strain distribution of the materials during the ultrasonic shot peening process. The multiple impacts of the shot with a short duration can be simulated using the established FE simulation model; however, it is still a challenge for a long-period simulation;
- (c)
- According to the simulation results, the intensity of the impact during the ultrasonic shot peening process can be significantly improved by increasing the amplitude of the ultrasonic tip and frequency of the ultrasonic signal, as well as by decreasing the working distance from the target surface to the ultrasonic tip;
- (d)
- The motion behavior of the multiple shots cannot be simplified by a series of single-shot impacts according to the observation of the high-speed camera during the ultrasonic shot peening process. We identified a relay effect for multiple impacts during the ultrasonic shot peening process experimentally. This relay effect can increase the efficiency of the ultrasonic shot peening process.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameters | Value/Set |
---|---|
Yield strength (MPa) | 230 |
Young’s modulus (GPa) | 210 |
Poisson ratio | 0.3 |
Density (g/cm3) | 7.8 |
Gravity field (m/s2) | 9.8 |
Vibrating frequency (kHz) | 20 |
Vibrating amplitude (μm) | 50 |
Working distance (mm) | 5 |
Simulation duration (s) | 5.00 × 10−4 |
Target plate | Deformable |
Steel shots | Rigid body |
Vibrating surface | Deformable |
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Li, P.; Hu, S.; Liu, Y.; Hua, L.; Yin, F. Surface Nanocrystallization and Numerical Modeling of 316L Stainless Steel during Ultrasonic Shot Peening Process. Metals 2022, 12, 1673. https://0-doi-org.brum.beds.ac.uk/10.3390/met12101673
Li P, Hu S, Liu Y, Hua L, Yin F. Surface Nanocrystallization and Numerical Modeling of 316L Stainless Steel during Ultrasonic Shot Peening Process. Metals. 2022; 12(10):1673. https://0-doi-org.brum.beds.ac.uk/10.3390/met12101673
Chicago/Turabian StyleLi, Pengyi, Shan Hu, Yanxiong Liu, Lin Hua, and Fei Yin. 2022. "Surface Nanocrystallization and Numerical Modeling of 316L Stainless Steel during Ultrasonic Shot Peening Process" Metals 12, no. 10: 1673. https://0-doi-org.brum.beds.ac.uk/10.3390/met12101673