Superalloy and titanium alloy

due to their superior performance

are widely used in aerospace field. But because of its high temperature strength

poor thermal conductivity

serious work hardening phenomenon and severe tool wear during the machining processing

the processed surface quality is low. Titanium alloy has small plastic and strong activity which is easy to be oxidized or produces hydrogen brittleness; It is hard to be machined since its serious work-hardening and sticking cutters during machining. Electrical discharge machining (EDM)

relying on high temperature generated by spark discharge to remove materials

the tool electrode and workpiece do not contact

processing is not limited by the mechanical properties of materials

so it has important significance in the processing for superalloy and titanium alloy. The latest progress of superalloy and titanium alloy machined by EDM is reviewed in six aspects

including EDM contour machining

EDM wire-cutting

Micro-EDM

EDM milling

EDM surface strengthening

and other EDM processing techniques and main research achievements are introduced.