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Experimental Study on Forged TC4 Titanium Alloy Fatigue Properties under Three-Point Bending and Life Prediction

Aeronautics Engineering College, Air Force Engineering University, Xi’an 710038, China
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Academic Editors: Jaroslaw Galkiewicz and Lucjan Śnieżek
Materials 2021, 14(18), 5329; https://doi.org/10.3390/ma14185329
Received: 24 August 2021 / Revised: 8 September 2021 / Accepted: 13 September 2021 / Published: 15 September 2021
Ultrasonic fatigue tests of TC4 titanium alloy equiaxed I, II and bimodal I, II obtained by different forging processes were carried out in the range from 105 to 109 cycles using 20 kHz three-point bending. The results showed that the S-N curves had different shapes, there was no traditional fatigue limit, and the bimodal I had the best comprehensive fatigue performance. The fracture morphology was analyzed by SEM, and it was found that the fatigue cracks originated from the surface or subsurface facets, showing a transgranular quasi-cleavage fracture mechanism. EDS analysis showed that the facets were formed by the cleavage of primary α grains, and the fatigue cracks originated from the primary α grain preferred textures, rather than the primary α grain clusters. From the microstructure perspective, the reasons for better equiaxed high-cycle-fatigue properties and better bimodal ultra-high-cycle-fatigue properties were analyzed. The bimodal I fatigue life prediction based on energy was also completed, and the prediction curve was basically consistent with the experimental data. View Full-Text
Keywords: forging; TC4 titanium alloy; three-point bending; very high cycle fatigue; microstructure; life prediction forging; TC4 titanium alloy; three-point bending; very high cycle fatigue; microstructure; life prediction
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MDPI and ACS Style

Wang, B.; Cheng, L.; Li, D. Experimental Study on Forged TC4 Titanium Alloy Fatigue Properties under Three-Point Bending and Life Prediction. Materials 2021, 14, 5329. https://doi.org/10.3390/ma14185329

AMA Style

Wang B, Cheng L, Li D. Experimental Study on Forged TC4 Titanium Alloy Fatigue Properties under Three-Point Bending and Life Prediction. Materials. 2021; 14(18):5329. https://doi.org/10.3390/ma14185329

Chicago/Turabian Style

Wang, Bohan, Li Cheng, and Dongchun Li. 2021. "Experimental Study on Forged TC4 Titanium Alloy Fatigue Properties under Three-Point Bending and Life Prediction" Materials 14, no. 18: 5329. https://doi.org/10.3390/ma14185329

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