The Impact of Surface Treatment Processes on the Fatigue Life of Fasteners

Abstract:

Titanium alloy fasteners are extensively used in advanced fields such as aerospace due to their corrosion resistance, high-temperature endurance, low density, and high strength-to-weight ratio. In practical applications, fatigue failure is the primary failure mode for these fasteners. Besides the operational environment, the manufacturing process, especially surface treatment techniques, plays a crucial role in affecting the fatigue life of titanium alloy fasteners. This paper examines the impact of three surface treatment processes-rolled fillet, pulsed anodization, and molybdenum disulfide coating－on the fatigue life of titanium alloy fasteners through orthogonal experiments. The study finds that both rolled fillet and molybdenum disulfide coating significantly influence the fatigue life. This effect is associated with residual stresses, where compressive residual stress initially increases with rolling pressure but subsequently decreases, and reduces as the thickness of the molybdenum disulfide lubricating film rises.

• Periodical: Solid State Phenomena (Volume 366)
• Pages: 101-108
• DOI: https://doi.org/10.4028/p-7z3vT3
• Online since: December 2024
• Authors: Hao Xu, Hao Yang Liang, Hao Shan Li*, Rui Ma, Xin Fu Liang, Wei Gao
• Keywords: Fatigue, Orthogonal Experiment, Residual Stress, Surface Treatment Processes, Titanium Alloy Fastener

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