Effect of microstructures on fatigue property of TC18 titanium alloy with equal strength

AbstractMechanical properties including fatigue property and microhardness of pre and post fatiguing, have been investigated for four different microstructures (near bi-model, lamellar and basketweave) of TC18 titanium alloys. The correlation of condition fatigue strength and microhardness decreasing among different microstructures have been discussed. On the condition of equal strength and after 107 cycles, it was found that the near bi-model and fine basketweave microstructure have superior fatigue property compared with the lamellar and coarse basetweave microstructure, respectively. The decrease amplitudes of pre and post fatiguing for different microstructures were different. The near bi-model microstructure, which had high fatigue strength has almost the same microhardness of pre and post fatiguing. But the microhardness of lamellar and basketweave microstructures, which had inferior fatigue strengths decreased significantly