Iron-based alloy powder for laser refabrication of rotor journal, and refabrication method thereof

The invention discloses an iron-based alloy powder for the laser refabrication of a rotor journal, and a refabrication method thereof. The iron-based alloy powder comprises the following components in weight percentage: 0.03-0.1% of C, 13.0-16.0% of Cr, 0.9-1.5% of Si, 0.5-1.0% of B and iron as the balance. The laser refabrication method comprises the steps of (1) subjecting the failure part of a rotor journal to the lathe machining treatment to enable the surface thereof to be clean and flat, and removing oil; (2) adding the dried iron-based alloy powder into a powder feeder; (3) adjusting the laser position to be within a to-be-repaired region, and editing a program; (4) setting laser process parameters; (5) according to actual needs, repeating the laser cladding process to form multiple cladding layers till the cladding layers exceed a target size and a machining allowance is reserved; (6) turning to reach the target size by a lathe; (7) conducting the hardness and crack detection. According to the invention, the performance of a coating is approximate to the performance of an original new product. Meanwhile, the advantages of wide process adaptability, consistent repeatability and strong operability are realized.