A 3-D PRINTING METHOD AND A 3-D PRINTOUT

摘要

The present invention provides a 3-D printing method and a 3-D printout, wherein the 3-D printing method comprises the following steps: SI. laser-scan a printing material according to a 3-D printing model so that said printing material starts to be sintered into a printout in the preset shape layer by layer from the bottom up; S2. feed a treatment gas into a 3-D printing device and laser-scan a local area of said printout so that said treatment gas reacts with the surface of the local area of said printout and a hardened layer is formed, wherein said step SI and said step S2 are performed alternately until a printout with local hardened layers is formed. By adjusting the gas environment, the present invention enables the components manufactured by selective laser melting equipment to have a wear- and corrosion-resistant nitrided surface layer and keep the expected ductility of the central area. The nitrided layer has an ideal lattice structure. No additional surface treatment is required for the present invention, and therefore, the power consumption and the cost are lower. The in-situ nitridation process provided by the present invention precisely controls the nitridation gradient.