High temperature alloy forgings are one of the main products of zhuhong.High-temperature alloys are a class of metallic materials that can function under high temperatures above 600°C and under certain stress conditions for extended periods. They exhibit remarkable properties such as excellent high-temperature strength, good oxidation and hot corrosion resistance, fatigue resistance, fracture toughness, and comprehensive performance. These characteristics make high-temperature alloys widely applicable in various fields, including aerospace, energy, petroleum, and chemical industries.

I. Definition and Classification

High-temperature alloys are formed by adding other alloying elements to iron, nickel, or cobalt as the base. Based on the base element, they are classified into three major categories: iron-based, nickel-based, and cobalt-based alloys. Among them, nickel-based high-temperature alloys are particularly significant in the aerospace industry due to their superior high-temperature performance and processability.
 

II. Performance Characteristics

1. High-Temperature Strength: High-temperature alloys maintain high yield strength and tensile strength at elevated temperatures, which is their most notable performance feature.
2. Oxidation and Hot Corrosion Resistance: They possess good oxidation and hot corrosion resistance, enabling them to function in harsh high-temperature oxidation environments.
3. Fatigue Resistance: Under high temperatures and alternating stresses, high-temperature alloys maintain good fatigue properties.
4. Fracture Toughness: They exhibit high fracture toughness, effectively resisting crack propagation and fracture occurrence.

III. Application Fields

1. Aerospace: High-temperature alloys are the core materials for aerospace engines and gas turbines, used in manufacturing critical components such as combustion chambers, turbine blades, and turbine disks. In advanced aerospace engines, the usage of high-temperature alloys has exceeded 50%.
2. Energy: In power generation equipment, high-temperature alloys are used to manufacture turbine disks and other critical components, enhancing power generation efficiency. Additionally, the localization of nuclear power equipment has driven the demand for domestic high-temperature alloys.
3. Petrochemical Industry: In high-temperature, high-pressure environments of oil refining and chemical industries, high-temperature alloys are utilized in manufacturing reactors, catalyst supports, and other critical equipment.

IV. Manufacturing Processes

The manufacturing processes of high-temperature alloys are complex and intricate, including the following steps:

1. Raw Material Preparation: Select appropriate raw materials, subject them to mixing, crushing, sieving, and other treatments to achieve the desired chemical composition and physical properties.
2. Melting: Place the raw materials in a high-temperature furnace for melting, adding appropriate alloying elements. After mixing and degassing, the melt achieves a uniform composition and purity.
3. Casting: Pour the melt into a mold for casting. Common casting methods include vacuum arc investment casting, vacuum free pouring casting, and directional solidification.
4. Heat Treatment: Perform heat treatment on the cast high-temperature alloy to obtain the desired grain size, phase structure, and mechanical properties. Heat treatment typically includes solution treatment and aging treatment.
5. Surface Treatment: Conduct polishing, pickling, electrochemical polishing, and other surface treatments to enhance the appearance quality and corrosion resistance of the high-temperature alloy.
6. Inspection: Perform various performance tests and inspections on the manufactured high-temperature alloy, including chemical composition, metallographic structure, mechanical properties, and high-temperature properties.

 

In addition to the excellent performance in the field of forging conventional alloys, the performance of high temperature alloys is also very bright. We have 5 expert high temperature alloy forging engineers and complete high temperature alloy supporting facilities, contributing to the global aerospace and new energy fields.