Laser 3D printing method for in-situ synthesized alumina particle reinforced nickel base composite

Abstract

A laser 3D printing method for an in-situ synthesized alumina particle reinforced nickel base composite comprises the steps that firstly, nickel base alloy and pure aluminum powder are subjected to mechanical ball milling, particle size screening is carried out on the powder obtained after ball milling, and a laser 3D printing technological window is initially optimized; a temperature changing curve of a molten pool is recorded regularly with a colorimetric pyrometer, and the average peak temperature T of the temperature curve, the intercept t of the solid phase line and the temperature curveand the average cooling rate Xi of the molten pool are extracted and calculated; and technological parameters are optimized according to the principles that T is higher than or equal to 1.4 Tm and lower than or equal to 1.8 Tm, t is larger or equal to 0.55 s and smaller than or equal to 0.95 s and Xi is larger than or equal to 3.5*103 DEG C / s, and an optimized technological window is obtained, wherein the laser output power is 800-1200 W, the defocusing amount is -2.5 mm, the diameter of a laser spot is 2-3 mm, the scanning speed is 8-14 mm / s, and the powder feeding amount is 12-16 g / min. By means of the laser 3D printing method, in-situ synthesis of alumina particles can be achieved in the forming process, and the mechanical performance of nickel base forming parts can be improved.

Description

technical field [0001] The invention relates to the field of laser material processing, in particular to a laser 3D printing method for in-situ synthesis of aluminum oxide particle-reinforced nickel-based composite materials. Background technique [0002] Nickel-based superalloys are widely used in aviation, aerospace and energy fields due to their good high-temperature mechanical properties and corrosion resistance, such as the manufacture of key components of steam turbines and aero-engines. Because the working environment of nickel-based superalloys is usually very harsh, such as high temperature, high pressure and oxidation corrosion, etc., and with the rapid development of aviation, aerospace engine and gas turbine technology, the applicable temperature and high-temperature performance of nickel-based superalloy materials are higher. requirements. Generally, directionally solidified crystals and single crystals can effectively improve the high-temperature performance o...

AI Technical Summary

Problems solved by technology

However, the use of this technology to introduce oxide particles still has problems such as poor distribution uniformity, high-temperature melting of particles, poor bonding with the matrix interface, and coarse particles.

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