Method for component machining by ablation and controlled recast layer removal by fluoride ion cleaning

Abstract

Components, such as turbine blades or vanes, are formed to a desired shape and dimensions by ablation machining a work piece surface. Recast layer material created on the work piece surface during the ablation machining is subsequently removed by fluoride ion cleaning (FIC). Exemplary ablation machining methods include laser machining and electric discharge machining (EDM). The work piece material may include superalloys commonly used for fabrication of turbine blades or vanes, which are susceptible to recast layer formation during EDM or laser machining. Post ablation FIC recast layer removal is easier than known methods, such as mechanical grinding, secondary EDM machining of the layer at lower speeds and/or current intensity, or chemical etching processes. Ablation machining processes can be optimized for speed and efficiency without regard for recast layer avoidance, with knowledge that the recast layer will be subsequently removed by the complimentary FIC process.