Electron beam scanning method, refractory metal member and electron beam selective melting device

Abstract

An embodiment of the invention relates to an electron beam scanning method, a refractory metal member and an electron beam selective melting device. The electron beam scanning method includes the steps of receiving electron beam scanning path data, wherein the scanning path data are generated by planning according to slice data of a to-be-processed workpiece model and comprise a first scanning path and a second scanning path which are different; and after the electron beam selective melting device is filled with powder, conducting first electron beam melting scanning on a metal powder layer obtained powder paving according to the first scanning path, and then conducting second electron beam melting scanning according to the second scanning path. By means of the embodiment, the two different scanning paths are used for conducting electron beam selective melting scanning on the metal powder layer by using the two different scanning paths, on one aspect, thermal stress distribution is more uniform, and part layer warpage and deformation are not prone to being caused; and on the other hand, the metal powder layer is subjected to two times of electron beam selective melting scanning insequence, and therefore the defect of poor fusion of part layers is overcome to a certain extent.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of additive manufacturing, and in particular to an electron beam scanning method, a refractory metal component, and electron beam selective melting equipment. Background technique [0002] High melting point metals with a melting point higher than 1650°C, such as tungsten, tantalum, molybdenum, niobium, hafnium, chromium, vanadium, zirconium and titanium, tungsten, etc., and alloys formed by adding other elements based on these metals are called refractory metals. [0003] Before the mid-1940s, refractory products were mainly produced by powder metallurgy. From the late 1940s to the early 1960s, due to the development of aerospace technology and atomic energy technology, the application of metallurgical technologies such as consumable electric arc furnaces and electron bombardment furnaces promoted the use of refractory metals that can be heated at 1093-2360 °C or higher. Development o...

AI Technical Summary

Problems solved by technology

Due to the very low scanning speed in the melting stage, the local temperature gradient of the cross-section of the part to be melted becomes relatively large, so the fused part on the surface of the part to be melted and the powder to be fused are very prone to warping deformation, which leads to the failure of the entire preparation process or There are serious internal defects and other problems

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