| 摘要 |
<p>Superalloy component castings, such as turbine blades and vanes, are fabricated or repaired by an electroslag or electrogas welding process that at least partially replicates the crystal structure of the original cast substrate in a cast-in-place substrate extension. The process re- melts the base substrate surface and grows it with new molten filler material. As the base substrate (20) and the filler material (44, 45, 46) solidify, the newly formed "re-cast" component has a directionally solidified uniaxial substrate extension portion (50) that at least in part replicates the crystalline structure of the base substrate (20). The "re-cast" component can be fabricated with a unified single crystal structure, including the extension portion. In other applications, a substrate extension can replicate a directionally solidified uniaxial crystal structure of an original base substrate casting. Polycrystalline substrate base structures can be re-cast with a substrate extension that replicates base substrate crystals that are most parallel to the uniaxial casting direction.</p> |
