Effect of Repeated Processing Passes during Ultrasonic Rolling on Fatigue Performance and Corrosion Resistance of Ti6Al4V Alloy
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials
2.2. USRP Treatment
2.3. Microstructure Characterization
2.4. Fatigue Test and Electrochemical Test
3. Results and Discussion
3.1. Surface Morphology of Ti6Al4V Alloy in Different Processing States
3.2. Microstructure and Stress Distribution of Ti6Al4V Alloy with Different States
3.3. Fatigue Performance of Ti6Al4V Alloy with Different States
3.4. Electrochemical Corrosion Behavior of Ti6Al4V Samples with Different States
4. Conclusions
- Ultrasonic rolling processing can cause cumulative plastic deformation on the surface of a Ti6Al4V alloy, refine the surface grains, and introduce residual compressive stress. Increasing the processing passes will deepen the grain refinement layer and significantly improve the surface hardness of the Ti6Al4V alloy. The depth of the plastic deformation layer for Ti6Al4V alloy can reach 230 μm after twenty passes of ultrasonic rolling, but excessive processing passes will adversely affect the surface integrity and cause the stress relaxation. Five passes of processing can introduce a more stable residual stress field, which can still reach a stress value of −390 MPa at a depth of 500 μm.
- Ultrasonic rolling processing can effectively improve the fatigue resistance of Ti6Al4V alloy, but its fatigue life does not increase with the increase in processing passes. The anti-fatigue effect of the Ti6Al4V alloy reaches a better state when only five passes are selected. Under 600 MPa, the fatigue life of the Ti6Al4V alloy treated by USRP with five passes can reach 329 kilocycles, which is 8 times higher than that of the untreated sample. The lower surface roughness, suitable fine-grained strengthening layer, deep and stable residual compressive stress field together allows for the five-passes processing to provide greater gain for the fatigue resistance of the Ti6Al4V alloy.
- Ultrasonic rolling processing can also endow the Ti6Al4V alloy with a better passive performance and improve its corrosion resistance to a certain extent, especially in an acidic solution system. Relatively speaking, the five-passes-processed samples performed better, which has a higher charge transfer resistance (Rct) value.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Ti6Al4V Samples | Qf/F·cm−2 | nf | Rf/Ω·cm2 | Qdl/F·cm−2 | ndl | Rct/Ω·cm2 |
---|---|---|---|---|---|---|
untreated alloy | 1.187 × 10−5 | 0.901 | 288.6 | 1.756 × 10−5 | 0.822 | 2.272 × 106 |
USRP sample (1 pass) | 1.787 × 10−5 | 0.927 | 356.7 | 7.859 × 10−6 | 0.921 | 2.827 × 106 |
USRP sample (5 passes) | 1.998 × 10−5 | 0.939 | 362.4 | 1.036 × 10−5 | 0.835 | 3.720 × 106 |
USRP sample (20 passes) | 6.493 × 10−5 | 0.916 | 420.4 | 4.01 × 10−5 | 0.901 | 3.593 × 106 |
Ti6Al4V Samples | Qf/F·cm−2 | nf | Rf/Ω·cm2 | Qdl/F·cm−2 | ndl | Rct/Ω·cm2 |
---|---|---|---|---|---|---|
untreated alloy | 5.018 × 10−5 | 0.907 | 315.6 | 1.417 × 10−5 | 0.9213 | 4.991 × 104 |
USRP sample (1 time) | 6.726 × 10−5 | 0.944 | 128.5 | 3.049 × 10−4 | 0.8753 | 6.378 × 104 |
USRP sample (5 times) | 1.788 × 10−5 | 0.965 | 468.6 | 4.828 × 10−5 | 0.8241 | 8.545 × 105 |
USRP sample (20 times) | 2.842 × 10−5 | 0.959 | 435.7 | 8.148 × 10−5 | 0.6733 | 6.072 × 104 |
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Wang, S.; Yu, T.; Pang, Z.; Yin, X.; Liu, X. Effect of Repeated Processing Passes during Ultrasonic Rolling on Fatigue Performance and Corrosion Resistance of Ti6Al4V Alloy. Metals 2023, 13, 1719. https://doi.org/10.3390/met13101719
Wang S, Yu T, Pang Z, Yin X, Liu X. Effect of Repeated Processing Passes during Ultrasonic Rolling on Fatigue Performance and Corrosion Resistance of Ti6Al4V Alloy. Metals. 2023; 13(10):1719. https://doi.org/10.3390/met13101719
Chicago/Turabian StyleWang, Shuaixing, Tianjian Yu, Zhiwei Pang, Xiaole Yin, and Xiaohui Liu. 2023. "Effect of Repeated Processing Passes during Ultrasonic Rolling on Fatigue Performance and Corrosion Resistance of Ti6Al4V Alloy" Metals 13, no. 10: 1719. https://doi.org/10.3390/met13101719