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.
Highlights
Fretting is usually recognized as a kind of near-surface damage arising from the relative slip between the contact surfaces of many mechanical assemblies, such as dovetail joints, bolts and flange connections
Relevant researches showed that laser quenching improve the surface hardness and induce the compressive residual stresses beneath the contact surfaces, which result in a good performance in fretting wear resistance [9]
The purpose of this paper is to investigate the effect of laser quenching on the fretting fatigue life of TC11 by a series of fretting fatigue tests
Summary
Fretting is usually recognized as a kind of near-surface damage arising from the relative slip between the contact surfaces of many mechanical assemblies, such as dovetail joints, bolts and flange connections. Plenty studies have shown that the service life of the mechanical connection structures can be reduced by more than 30% or even as high as 80% due to the existence of fretting fatigue [2,3,4]. Many surface treatments, such as coating and shot peening, have been proved to be effective in improving the fretting fatigue lives by the improvement of the surface wear resistance [5,6,7,8]. Relevant researches showed that laser quenching improve the surface hardness and induce the compressive residual stresses beneath the contact surfaces, which result in a good performance in fretting wear resistance [9]
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