High-purity nickel-based high-temperature alloy and preparation method of spherical powder of high-purity nickel-based high-temperature alloy

Abstract

The invention discloses a high-purity nickel-based high-temperature alloy and a preparation method of spherical powder of the high-purity nickel-based high-temperature alloy. The alloy comprises the following steps of selecting high-purity metal ingredients, smelting in a vacuum induction suspension smelting furnace, realizing pure smelting by controlling parameters such as smelting vacuum degree, refining temperature, time and the like, then pouring to obtain a steel ingot, and preparing the steel ingot into a bar; carrying out smelting, atomizing and powdering on the bar through EIGA and PREP technologies to obtain spherical metal powder; adopting vibrating screening and airflow classification, and classifying spherical powder under the protection of inert gas. According to the method, the content of nonmetal impurities is effectively controlled through raw material smelting control, atomization process control and post-treatment control, so that chemical elements of the powder have extremely high purity, and the high-purity high-temperature alloy spherical powder is not prone to generating cracks and other defects in the subsequent laser additive printing and laser cladding process and is good in binding force, high in strength, good in toughness and good in mechanical property, and the powder can be used for repairing high-end parts.

Description

technical field [0001] The invention relates to the fields of laser cladding, additive manufacturing and high-end repair, and more specifically, to a method for preparing spherical powder of high-purity nickel-based superalloy. Background technique [0002] At present, in the manufacturing technology of nickel-based superalloy, the alloy raw material is usually induction-melted and poured into the mold tube to prepare the alloy rod. The bar has many internal defects and impurities, and there is also the problem of loose pores, especially under the influence of various impurity elements such as C, P, S, Si, Mn, O, N, H, etc., the high temperature processing of the bar Performance and comprehensive mechanical properties are greatly affected. In particular, the oxygen and nitrogen in superalloys are called residual gases and are classified as harmful elements. The increase of N content will reduce the high temperature tensile strength and plasticity of the high temperature cor...

AI Technical Summary

Problems solved by technology

This method cannot guarantee the preparation of high-purity products. During the production process, the molten metal will come into contact with a variety of basic oxide crucibles or other ceramic refractory materials. These non-metallic impurities will be washed into the metal by the molten metal during the atomization process. In the powder, it becomes a non-metallic impurity

At the same time, the oxide impurities in the molten metal will float on the upper layer after forming a clear liquid, and enter the tundish to block the leak during the pouring process, thus causing the furnace to be blocked and the furnace formation rate is low; at the same time, the superalloy prepared by gas atomization The powder will have a high hollow powder rate and insufficient sphericity, which will lead to problems such as cracking and poor welding performance when used in the end.

Images