Study on the Effect of Laser Quenching on Fretting Fatigue Life

Abstract

Laser quenching hardening is one of the most used surface treated technologies. In order to study the effect of laser quenching on the fretting fatigue life, fretting fatigue experiments of TC11 (Ti-6.5Al-1.5Zr-3.5Mo-0.3Si) titanium alloy specimens with different surface conditions were carried out on a special hydraulic servo fatigue test system. The experimental results showed that laser quenching hardening has a good performance in increasing the fretting fatigue lives of the TC11 alloy. However, the effects of laser quenching on fretting fatigue are more obviously at low stress level than at high stress level, the fretting fatigue life was increased by 110.78% at low stress level and 17.56% at high stress level, respectively. Based on the critical plane approach, the traditional SWT (Smith–Watson–Topper) parameter was modified and used to describe the fretting fatigue life of the TC11 alloy after hardening by the consideration of the variations of the hardening layer’s elastic modulus. Compared with the experimental results, all the errors of the predicted results lied in the error band of two.

Optimization of a Certain Type of Aero-Engine Three-Tooth Mortise and Tenon Joint Structure against Fretting Fatigue

“…The errors in the predicted life compared to the test life were within a factor of two error bands, demonstrating the validity of the life prediction model. According to research by Zhang et al [25], laser quenching hardening had a more noticeable impact at low-stress levels than it did at high-stress levels on the fretting fatigue characteristics of theTC11 alloy. The traditional SWT (Smith-Watson-Topper) parameter was updated and utilized to describe the fretting fatigue life of the TC11 alloy after hardening.…”

Effect of Contact Stress and Slip Amplitude on the Fretting Fatigue Behaviour of Ultrasonic Surface Nanocrystallized Tc11 Titanium Alloy

“…Yang et al [33] improved the fretting fatigue life of TC11 titanium alloy by laser shock peening, and suggested that the fretting fatigue cracks were mainly nucleated in β phase. Zhang et al [34] investigated the effect of laser quenching on the fretting fatigue properties of TC11 titanium alloy. And proved that the SWT model is accurate in predicting the low-cycle fretting fatigue life of TC11 titanium alloy.…”

Effect of Laser Shock Peening on Fretting Fatigue Life of TC11 Titanium Alloy

“…Considering that the original design configuration of many components is difficult to change, the research on surface protection techniques of fretting fatigue has been developed since the 1960s, and some techniques have been applied successfully [ 4 ]. The principle of most surface protection techniques, such as coating and shot peening, is to introduce residual compressive stress into the contact surface, reduce the friction coefficient of the contact surface, and improve the hardness and wear resistance of the contact surface [ 5 , 6 , 7 , 8 , 9 , 10 ]. As an advanced surface treatment, laser shock peening (LSP) which induces the deep compressive residual stresses beneath the contact surfaces has been proved to be significantly beneficial to improve the fretting fatigue lives [ 11 ].…”