| 摘要 |
A method of correcting defects in a metal workpeice. A location of a defect in a workpiece is determined. The defect comprising a void or an inclusion in a workpiece substrate. The workpiece substrate is comprised of a metal alloy. Material of the workpiece substrate at the location of the defect is removed to form cleaned area in the workpiece substrate. The cleaned area in the workpiece substrate is coated with a high-density coating. A sintering heat treatment is performed on the coated workpiece substrate to remove entrapped gas from the coating material prior to a step of hot isostatic pressing treating. Then, hot isostatic pressing treating is performed on the coated workpiece to produce diffusion bonding bewteen the workpiece substrate and the high-density coating. The material can be removed by techniques such as sandblasting or grinding. A high-density coating process such as hyper-velocity oxy-fuel thermal spray process or a detonation gun process is used to apply the high-density coating to the substrate at the location of the cleaned area. The high-density coating may have the same metal alloy composition as the metal alloy substrate. The metal alloy substrate may comprise a nickel or cobalt-based superalloy, and the high-density coating may have the same nickel or cobalt-based super alloy composition as the metal alloy substrate.
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