TY - JOUR
T1 - Studies on surface integrity and fatigue performance of Ti-17 alloy induced by ultrasonic surface rolling process
AU - Tan, Liang
AU - Tang, Wenhao
AU - Wang, Manqi
AU - Zhang, Yufei
AU - Yao, Changfeng
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/9/15
Y1 - 2025/9/15
N2 - The surface integrity and fatigue performance of Ti-17 titanium alloy under different ultrasonic surface rolling (USR) process are investigated, the fatigue fracture morphologies are compared and analyzed. The results show that USR process enhances the surface integrity characteristics of the Ti-17 titanium alloy specimen. The surface roughness Ra values of the USR treated specimens are <0.3 μm, and the surface stress concentration coefficients are within the range of 1.009 to 1.028. USR process induces a compressive residual stress affected layer of 100 to 500 μm, a work-hardened layer of 100 to 300 μm, and a gradient microstructure. The average fatigue life of the U01# treated specimen with better surface integrity characteristics is approximately 9.7 times higher than that of U06# treated specimen. Observing the fatigue fractures, the fatigue crack initiation positions of the USR treated specimen are located on the subsurface at a distance of 200 to 500 μm from the surface. The fatigue crack initiation is linked to the stress concentration resulting from internal material defects and the uneven distribution of residual stress. The fatigue crack growth rate is relatively stable for the USR treated specimens with longer fatigue life. The crack initiation life of the USR treated specimens exceeds 90 % of their total fatigue life due to the improved surface integrity characteristics. The improvement of USR process on the rotating bending fatigue performance of Ti-17 titanium alloy is mainly reflected in the prevention of crack initiation and delay of crack propagation.
AB - The surface integrity and fatigue performance of Ti-17 titanium alloy under different ultrasonic surface rolling (USR) process are investigated, the fatigue fracture morphologies are compared and analyzed. The results show that USR process enhances the surface integrity characteristics of the Ti-17 titanium alloy specimen. The surface roughness Ra values of the USR treated specimens are <0.3 μm, and the surface stress concentration coefficients are within the range of 1.009 to 1.028. USR process induces a compressive residual stress affected layer of 100 to 500 μm, a work-hardened layer of 100 to 300 μm, and a gradient microstructure. The average fatigue life of the U01# treated specimen with better surface integrity characteristics is approximately 9.7 times higher than that of U06# treated specimen. Observing the fatigue fractures, the fatigue crack initiation positions of the USR treated specimen are located on the subsurface at a distance of 200 to 500 μm from the surface. The fatigue crack initiation is linked to the stress concentration resulting from internal material defects and the uneven distribution of residual stress. The fatigue crack growth rate is relatively stable for the USR treated specimens with longer fatigue life. The crack initiation life of the USR treated specimens exceeds 90 % of their total fatigue life due to the improved surface integrity characteristics. The improvement of USR process on the rotating bending fatigue performance of Ti-17 titanium alloy is mainly reflected in the prevention of crack initiation and delay of crack propagation.
KW - Fatigue fracture morphology
KW - Fatigue life
KW - Surface integrity
KW - Ti-17 titanium alloy
KW - Ultrasonic surface rolling process
UR - http://www.scopus.com/inward/record.url?scp=105006880602&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2025.132336
DO - 10.1016/j.surfcoat.2025.132336
M3 - 文章
AN - SCOPUS:105006880602
SN - 0257-8972
VL - 512
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 132336
ER -