TY - JOUR
T1 - On the influence of ultrasonic surface rolling process on surface integrity and fatigue performance of Ti-6Al-4V alloy
AU - Liu, Chengsong
AU - Liu, Daoxin
AU - Zhang, Xiaohua
AU - He, Guangyu
AU - Xu, Xingchen
AU - Ao, Ni
AU - Ma, Amin
AU - Liu, Dan
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/7/25
Y1 - 2019/7/25
N2 - An ultrasonic surface rolling process (USRP) is a novel mechanical surface treatment technique for enhancing the fatigue performance of metallic materials. In this work, USRP with different repeated processing numbers was employed for enhancing the fatigue performance of a Ti-6Al-4V alloy. The effect of USRP on their surface integrity (including microstructure, surface quality, microhardness, and residual stress) were investigated, which were characterized by means of scanning electron microscope, transmission electron microscope, confocal laser scanning microscope, microhardness tester, and X-ray diffraction residual stress tester. Especially, a refined microstructure (grain size: ~100–400 nm) was formed on the topmost surface of twelve-repeat USRP specimen. Subsequently, the fatigue behavior of the specimens was investigated via rotating-bending fatigue tests, and the results suggested that USRP could effectively enhance the fatigue performance of the Ti-6Al-4V alloy. The USRP-induced enhancement mechanism of the fatigue performance can be ascribed to the synergistic effect of the compressive residual stress, microstructure, work hardening, and improved surface quality. The best synergistic effect and, correspondingly, the greatest improvement in the fatigue performance were realized for the one-repeat USRP specimen.
AB - An ultrasonic surface rolling process (USRP) is a novel mechanical surface treatment technique for enhancing the fatigue performance of metallic materials. In this work, USRP with different repeated processing numbers was employed for enhancing the fatigue performance of a Ti-6Al-4V alloy. The effect of USRP on their surface integrity (including microstructure, surface quality, microhardness, and residual stress) were investigated, which were characterized by means of scanning electron microscope, transmission electron microscope, confocal laser scanning microscope, microhardness tester, and X-ray diffraction residual stress tester. Especially, a refined microstructure (grain size: ~100–400 nm) was formed on the topmost surface of twelve-repeat USRP specimen. Subsequently, the fatigue behavior of the specimens was investigated via rotating-bending fatigue tests, and the results suggested that USRP could effectively enhance the fatigue performance of the Ti-6Al-4V alloy. The USRP-induced enhancement mechanism of the fatigue performance can be ascribed to the synergistic effect of the compressive residual stress, microstructure, work hardening, and improved surface quality. The best synergistic effect and, correspondingly, the greatest improvement in the fatigue performance were realized for the one-repeat USRP specimen.
KW - Compressive residual stress
KW - Fatigue performance
KW - Microstructure
KW - Surface integrity
KW - Ti-6Al-4V alloy
KW - Ultrasonic surface rolling process
UR - http://www.scopus.com/inward/record.url?scp=85075479278&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2019.04.080
DO - 10.1016/j.surfcoat.2019.04.080
M3 - 文章
AN - SCOPUS:85075479278
SN - 0257-8972
VL - 370
SP - 24
EP - 34
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -