Laser additive manufacturing molten pool structure evolution in-situ observation device and method

Abstract

The invention discloses a laser additive manufacturing molten pool structure evolution in-situ observation device which comprises an environment chamber, a synchrotron radiation X-ray source, a laser and a plane detector, the environment chamber is communicated with a molecular pump, an infrared transparent window is arranged at the top of the environment chamber, and the environment chamber is located between the synchrotron radiation X-ray source and the plane detector. A first beryllium window and a second beryllium window are arranged on the side wall of the environment chamber. The invention discloses a laser additive manufacturing molten pool structure evolution in-situ observation method which comprises the following steps: (1) placing alloy powder to be measured on a powder bed, and then placing the powder bed in an environment chamber; (2) starting a synchrotron radiation X-ray source and a laser, meanwhile, recording an X-ray beam image when the powder is melted by a plane detector, converting the X-ray beam image into an X-ray beam projection picture and storing the X-ray beam projection picture in the computer; and (3) processing the projection picture by using image processing software. According to the invention, in-situ observation and on-line nondestructive testing of the molten pool structure evolution process in the additive manufacturing process can be realized.

Description

technical field [0001] The invention relates to the technical field of X-ray beam non-destructive testing, in particular to a device and method for in-situ observation of molten pool structure evolution in laser additive manufacturing. Background technique [0002] Additive manufacturing technology, commonly known as 3D printing technology, is a new advanced manufacturing technology developed in the 1980s. It draws on the idea of ​​"discrete + accumulation" of rapid prototyping technology, uses powder as raw material, pre-layers the CAD model, spreads the powder material on the substrate area in advance, and uses the high-energy beam energy source to layer by layer according to the pre-planned scanning path Melt or sinter powders to create parts directly in net shape. Compared with the traditional subtractive manufacturing technology, this technology is characterized by high material utilization rate and short manufacturing cycle, and can realize rapid, mold-free and near-n...

AI Technical Summary

Problems solved by technology

[0004] However, the current traditional parts inspection methods are often destructive inspections. Parts are destroyed during the inspection process, and it is difficult to obtain more comprehensive inspection information.

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