Effect of Oxygen Concentration in Simulated Body Fluid on Fretting Fatigue of 316L Stainless Steel

The fretting fatigue test in simulated body fluid was carried out by hydraulic servo fatigue testing machine for 316L stainless steel which is commonly used as artificial joint material. The results show that the oxygen concentration in the simulated body fluid had an effect on fretting fatigue life of 316L stainless steel. When the mass fraction of dissolved oxygen in simulated body fluid was 4% and the number of cycle was 10⁷, the fretting fatigue strength was about 110 MPa. When the mass fraction of dissolved oxygen was 0% and the number of cycle was 3×10⁶, the fretting fatigue strength was about 10⁵ MPa. The crack growth speed in simulated body fluid was faster than that in air, so the fretting fatigue life was shorter than that in air.