A PROCESS FOR THE PRODUCTION OF ARTICLES MADE OF A GAMMA-PRIME PRECIPITATION-STRENGTHENED NICKEL-BASE SUPERALLOY BY SELECTIVE LASER MELTING (SLM)

摘要

A process for the production of three-dimensional articles made of a nickel-basesuperalloy is provided. The process includes: a) providing a selective lasermelting(SLM) apparatus; b) providing a model of said article with calculated crosssections;c) preparing powder of said alloy; d) preparing a powder layer with a uniformthickness on a substrate plate or on a previously processed powder layer; e)meltingsaid powder layer by scanning with a focused laser beam an area correspondingto across-section of said article according to the model; f) lowering thesubstrate plate byone layer thickness; g) repeating steps from d) to f) until reaching the lastcrosssection. In said melting step e) the laser power, focus diameter of the focalspot andscan speed of said laser beam are adjusted to obtain a weld bead aspect ratioofdepth to width of less than 0.5.