Abstract
The surface of TC4 titanium alloy was strengthened by powder-mixed near-dry EDM. In the research, the experimental investigation analyzed the influence of pulse on time and electrode polarity on strengthened layer microstructure of TC4 titanium alloy. The wear of the substrate surface and the strengthened layer was measured. The results showed that the number of corrosion pits and petal-like tissues of the strengthening layer increases first and then decreases with the increase of pulse on time. The more petals and pit tissues were obtained by negative electrode than positive electrode. When the pulse on time is 100μs and the electrode polarity is negative, it is beneficial to produce the petal-like and pit-like tissues. The petal-like strengthening phase is the key factor affecting the wear resistance of the strengthened layer. The experimental revealed that the wear resistance of the strengthened layer is about 3.5 times as much as that of the substrate.
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