1. Introduction

High temperature alloyshave good oxidation resistance, corrosion resistance, excellent tensile, endurance, and fatigue properties, as well as long-term organizational stability, and are developed to meet the requirements of modern aerospace technology under various high temperature conditions of use, demonstrating a strong vitality in the field of advanced aerospace engines. Metallurgy of powder High temperature alloy is a high temperature alloy prepared by powder metallurgy method, which has the advantages of uniform organization, no macroscopic segregation, and high yield strength, good fatigue performance, and so on, over the traditional casting and forging high temperature alloy. To overcome the segregation (non-uniformity) generated by the conventional process, each particle of the pre-alloyed powder used is a "micro ingot", alloy segregation can only occur if It can improve the overall performance of the alloy, minimize the quantity of cutting and machining, and increase the alloy's usage rate.

2.Classification

Powder metallurgy high-temperature alloys are often classified as dispersion-reinforced or precipitation-reinforced based on the method of alloy strengthening.

Dispersion-reinforced high-temperature alloys are strengthened with inert oxides, which are highly stable in physical and chemical properties and have a high strengthening effect at temperatures where the typical precipitation-reinforced phase softens, aggregates, or even dissolves. Internal oxidation, chemical co-precipitation, selective reduction, and other processes are used to create dispersion-reinforced high-temperature alloys. Furthermore, a new mechanical alloying procedure can be employed to create high-temperature alloys reinforced with yttrium oxide dispersion.

Precipitation-reinforced high-temperature alloys are being developed to overcome the drawbacks of conventional melting techniques, improve the overall performance of high-temperature alloys, and increase alloy use. This powder metallurgy high temperature alloy usespre-alloyed powder; each powder particle is truly a "micro ingot," and alloy segregation can occur only in the powder particle range. As a result, when compared to the same composition of the casting alloy, precipitation-reinforced high-temperature alloys have a small component segregation, a high initial melting temperature, and a lower tendency to precipitate harmful phases, which improves the overall performance of the alloy; and can make the original difficult to deform the alloy molding, reducing the amount of cutting and machining, and improving the alloy utilization. With the more complicated composition of high-temperature alloys and the increasing size of parts, this powder metallurgy high-temperature alloy displays increased superiority.

Nickel, iron, aluminum, titanium, cobalt, and other metal elements are relevant.

Some of the physical and electron microscopic images of metal powder are presented here.

(1)

 

No. Inconel625 Nickel-based high-temperature alloy powder

Features: include strong corrosion resistance, oxidation resistance, processability, and weldability.

Applications: Widely utilized in the production of aerospace engine parts, aerospace structural components, and chemical equipment components, as well as additive manufacturing.

(2)

 

No. 2024 aluminum alloy powder

Features: High fatigue strength; excellent cutting performance

Uses: Aircraft structure (skin, skeleton, rib beam, spacer, etc.), rivets, missile structure, propeller elements, and so on are examples of applications.