Fatigue Strength Evaluation During EDM Machining of Titanium Alloy

Titanium alloy falls under the category of materials that are used for a wide range of engineering applications like spacecraft, missiles, and aircraft because of their excellent corrosive resistance, high strength, and low-density properties. Machining of such hard titanium (grade-5) material is suitable by adopting advanced machining processes like the Electrical Discharge Machining process this paper deals with the same. In the first part of the paper effect of EDM process parameters like current, voltage, pulse on time, and pulse off time on material removal rate were investigated while in the second part of the paper effect of these process parameters on the fatigue strength of titanium alloy has been investigated. The experiments were designed using the Taguchi optimization L9 orthogonal array method. The obtained results show that the material removal rate is a maximum of 0.068 mm3/min with a voltage of 40 V, current of 8 A, pulse on at 60 µs, and pulse off at 9 µs respectively. And it is also noted that increase in current and pulse-on time the fatigue strength of titanium alloy decreases.