Method forming high-melting-point high temperature alloy part via multi-laser head multi-laser beam path scanning

Abstract

The invention provides a method forming a high-melting-point high temperature alloy part via multi-laser head multi-laser beam path scanning .First, metal powder is scanned by a first laser beam with power less than 200 W and short wavelength less than 1100 or long wavelength more than 10000nm in advance along a scanning path; the laser power is controlled, so pre-heat temperature is lower than a melting point of the metal powder; then a second laser beam with power no less than 200W and wavelength smaller than 1100nm to keep up with a moving direction of the first laser beam to repeatedly scan at the same linear moving speed; clockwise circular scanning surrounding the track center is conducted; a semi-annular high temperature field A is provided for the metal powder; a third laser beam keeps up with the moving direction of the first laser beam to repeatedly scan at the same linear moving speed; anticlockwise circular scanning surrounding the track center is conducted; a semi-annular high temperature field B is provided for the metal powder; a fourth laser beam keeps up with the scanning paths of the third and second laser beams to repeatedly scan at the same linear speed; an intersected area between the annular temperature field A and annular temperature field B is heated; and heat processing is conducted.

Description

[0001] Technical field [0002] The invention relates to a method for scanning and forming high melting point superalloy parts with multiple laser heads and multiple laser beam paths, which can realize the local preheating / melting / stress balance / heat treatment process of high melting point and high temperature alloy powder, and is suitable for rapid and precise high melting point and high temperature alloy parts. Shaped. [0003] Background technique [0004] High-melting, high-temperature alloys are high-temperature alloy materials composed of refractory metals such as tungsten and molybdenum with certain other elements. Compared with traditional alloy materials, the melting point is usually as high as 3000℃. Therefore, it is difficult to cast and smelt, and it is mostly processed by powder metallurgy. forming. However, it is difficult for powder metallurgy to directly form parts of any complex shape, and requires machining and subsequent heat treatment, which not only has comp...

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Problems solved by technology

[0008] In order to overcome the deficiencies of the existing technology, the present invention aims to solve the problems of difficult melting of high-melting-point superalloy powder and poor forming shape accuracy in the existing metal powder melting rapid prototyping, and proposes a multi-laser head and multi-laser beam path scanning forming high melting point High-temperature alloy parts method, which can continuously complete the preheating, solidification, residual stress balance and heat treatment process during the forming process of high-melting point superalloy parts, and realize rapid and high-precision forming of high-melting point superalloy parts

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