Multi-component rare earth magnesium alloy 3D printing process

Abstract

The invention discloses a multi-component rare earth magnesium alloy 3D printing process which adopts Mg-3.4-Y-3.6-Sm-2.6Zn-0.8Zr alloy powder. The printing process comprises the following steps of drying alloy powder before 3D printing; selecting a ZK61m alloy as a substrate material in printing, wherein the preheating temperature is 180 DEG C, and in a high purity argon atmosphere (the oxygen content is 10 ppm), the laser power is 30w, 40w, 50w and 60w, the scanning speeds are 200 mm/s, 300 mm/s, 400 mm/s, 500 mm/s and 600 mm/s, the powder paving thickness is 20 [mu]m, the laser hatch separation distance is 80 [mu]m, and the spot diameter is 60 [mu]m; and carrying out snakelike divisional scanning with a scanning track and carrying out rotation for 67 degrees layer by layer. By adoptinga substrate preheating and snakelike divisional scanning policy and reasonable process parameters, the problem of large residual stress in a 3D printing process is solved successfully. The density ofa prepared specimen is 84-98.6%, the surface quality is good and the alloy type is novel. Limit of raw materials in a current magnesium alloy 3D printing research process is broken. The multi-component rare earth magnesium alloy 3D printing process has higher scientific research value.

Description

technical field [0001] The invention relates to the technical field of 3D printing of new materials, in particular to a 3D printing process of a multi-element rare earth magnesium alloy. Background technique [0002] At present, the development of 3D printing technology is relatively mature. In recent years, 3D printing technology of titanium alloy, stainless steel and other materials has been commercialized, and the products prepared by it have played an irreplaceable role in aerospace, machinery manufacturing and other fields. The manufacturing process of magnesium alloy precision parts mostly adopts die-casting and semi-solid forming technology. These traditional casting processes have defects such as coarse grains, composition segregation, shrinkage cavity, shrinkage porosity, pores, inclusions, cracks, etc., which are serious. hinder the development of magnesium alloys. [0003] The application of magnesium alloy 3D printing technology can almost eliminate the defects ...

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Problems solved by technology

[0006] 1. When a conventional alloy is selected as the substrate material and is not preheated, the alloy powder cannot be well combined with the substrate material during the 3D printing process and the powder cannot spread quickly after melting, resulting in serious "spheroidization" and hindering 3D printing. the printing process

[0007] 2. The alloy powder adopts the conventional 3D printing process. When the powder layer height reaches 0.8mm, due to the excessive residual stress, the corners of the sample are severely warped, which hinders the normal progress of the powder spreading process, resulting in 3D printing. process fa

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