Abstract：Plastic deformed layers of as-cast single crystal(SX) nickel-based superalloy blade surface were formed by using three kinds of surface treatment process(grit blasting, abrasive belt polishing, felt wheel polishing). The deformed layers were electrolytic etched by using a specially designed electrolytic device, followed by standard heat treatment. Surface-treated deformed layers of single crystal superalloy blade and its electro-etched microstructures were investigated. The results show that the depths of deformed layers on as-cast SX blade surface are respectively about 6, 3.5μm and 2μm by using three kinds of surface treatment process. The microcrack fracture characteristics exist around the surface deformed layers by grit blasting and abrasive belt polishing. Large amounts of deformed γ' structure is existed in the electro-etched transition region of surface deformed layers, and the residual plastic deformation of three kinds of surface treatment process decreases successively in electro-etched transition region. Plastic deformation is not found in totally electro-etched region. After standard heat treatment, sag characteristics and recrystallized grains exist in non electro-etched region of deformed layers, but neither obvious pits nor recrystallized grains are found in totally electro-etched region.
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