Surface integrity analysis of electrochemical machining of γ-TiAl alloys

Study on the Key Technology of Electrochemical Machining Flow Field in Aero-Rotor Blades

“…Along with the rapid development of aerospace industry in recent years, the light weight and high performance of the material under the action of gas working fluid through high distortion and thin-walled blade structure has gradually become the development goal of the new generation aeroengine [2][3], and the complex shaped structure products with this new special alloy material have the poor tool accessibility, serious tool loss and easy deformation of blade profile in NC milling technology [4]; and the thermal re-casting layer and the heat affected zone after EDM will interfere with the forming quality of the key parts of the blade surface [5]. While electrochemical machining (ECM), as a non-contact electrochemical etching technology, can solve the problems of traditional NC milling by virtue of its advantages of not limited by the properties of workpiece materials, no loss of tool cathode and high machining efficiency [6], and electrochemical machining uses high-speed electrolyte to replace EDM with high-temperature breakdown discharge melting by electrochemical etching, thus avoiding the influence of hot casting layer and heat affected zone on molding quality to obtain excellent surface [7]. However, for electrochemical machining, electrochemical etching of anode materials is completely based on the electrochemical characteristic distribution of the electrolyte in the machining gap, considering that the distribution of electrolyte electrochemical characteristics in the machining gap is determined by the electrolyte flow channel structure by controlling the fluid mass transfer process, and finally acting on the forming quality through the distribution of electrochemical etching characteristics in various parts of the machining surface, therefore, the rational design and optimization of the flow channel is of great significance in the process of ECM.…”

Review Microstructure of Nickel-Based Single-Crystal CMSX-4 Superalloy after Electrochemical Machining

“…The surface integrity of three γ-TiAl alloy models was investigated after ECM by Wang et al Two levels of current densities were used to compare the low and high levels of process current densities' surface properties after ECM. Local corrosion and rough surfaces result from machining at low ow densities, while smooth surfaces (polishing) are created at high current densities of all three alloys [26].…”

Anodic Electrochemical Behaviors of 2219 Aluminum Alloy in NaNO3 and NaCl Electrolytes

“…Their research extended to the surface integrity analysis of three typical γ-TiAl alloys using ECM. 6 Furthermore, a schematic model was devised to depict the interface structure between the surface and passivation film of Inconel 718 and TC17. 7 Clifton et al 8 observed that processing TiAl with perchlorate could diminish the material's surface hardness.…”