Surface softening mechanism based on microstructure analyses under ultrasonic impact condition for Ti-17 titanium alloy

doi:10.1007/s40436-024-00525-w

Advances in Manufacturing ›› 2025, Vol. 13 ›› Issue (3): 562-583.doi: 10.1007/s40436-024-00525-w

Surface softening mechanism based on microstructure analyses under ultrasonic impact condition for Ti-17 titanium alloy

Chang-Feng Yao^1,2, Wen-Hao Tang^1,2, Liang Tan^1,2, Min-Chao Cui^1,2, Yun-Qi Sun^1,2, Tao Fan^1,2, Xu-Hang Gao^1,2

1. Key Laboratory of High Performance Manufacturing for Aero Engine, Northwestern Polytechnical University, Ministry of Industry and Information Technology, Xi'an, 710072, People's Republic of China;
2. Engineering Research Center of Advanced Manufacturing Technology for Aero Engine, Ministry of Education, Xi'an, 710072, People's Republic of China

Received:2023-12-16 Revised:2024-02-03 Published:2025-09-19
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant Nos.92160301, 92360309), and the Innovation Capability Support Program of Shaanxi Province (Grant No.2022TD-60).

Abstract

Abstract: Ultrasonic impact significantly influences the mechanical properties and flow stress of Ti-17 titanium alloy. In this study, compression tests on Ti-17 titanium alloy were conducted under ultrasonic impact conditions, varying ultrasonic amplitudes and compression rates. The flow stress, surface elemental content, microhardness, and microstructure of Ti-17 titanium alloy were tested, and the softening mechanism of Ti-17 titanium alloy under ultrasonic impact conditions was investigated. The results indicate that the softening mechanism of Ti-17 titanium alloy involved ultrasonic softening combined with stress superposition. Ultrasonic impact leads to a higher distribution of grain orientation differences, alters the distribution of small-angle grain boundaries, and changes the distribution of surface phases, resulting in a reduced density of α phases. The geometrically necessary dislocation density at the surface increases, and the average grain size decreases from 2.91 μm to 2.73 μm. The Brass-type texture essentially disappears, transforming mainly into a Copper-type texture {112}<11-1>, with the maximum pole density decreasing from 73.98 to 39.88.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-024-00525-w

Key words: Ultrasonic impact, Ti-17, Softening mechanism

Chang-Feng Yao, Wen-Hao Tang, Liang Tan, Min-Chao Cui, Yun-Qi Sun, Tao Fan, Xu-Hang Gao. Surface softening mechanism based on microstructure analyses under ultrasonic impact condition for Ti-17 titanium alloy[J]. Advances in Manufacturing, 2025, 13(3): 562-583.

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Surface softening mechanism based on microstructure analyses under ultrasonic impact condition for Ti-17 titanium alloy

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