GH3044
GH3044 is a solid-solution strengthened nickel-based superalloy. The following is a detailed introduction from the perspectives of its chemical composition, physical properties, mechanical properties, processing performance, and application fields:
Chemical Composition
Nickel (Ni): As the matrix element, it provides the alloy with excellent high-temperature strength and oxidation resistance, ensuring the stability of the alloy in high-temperature environments.
Chromium (Cr): With a content ranging from 23.5% to 26.5%, it significantly enhances the alloy’s oxidation resistance and corrosion resistance. It enables the formation of a dense oxide film in high-temperature oxidizing atmospheres, effectively preventing further oxidative corrosion.
Tungsten (W): With a content of 13% to 16%, it can increase the alloy’s high-temperature hardness and thermal stability, improving its strength and deformation resistance at high temperatures.
Titanium (Ti): With a content between 0.3% and 0.7%, it can refine grains, improve the strength and toughness of the alloy, and also help enhance the alloy’s oxidation resistance.
Physical Properties
Density: Approximately 8.89g/cm³. In fields such as aerospace, this density helps achieve lightweight design while ensuring structural strength.
Melting Point: The melting temperature range is 1352-1375℃, indicating good thermal stability, allowing it to maintain a stable physical state in high-temperature environments.
Thermal Conductivity: Gradually increases with rising temperature. At 100℃, the thermal conductivity is 11.7W/(m·℃), and at 900℃, it is 24.7W/(m·℃). Good thermal conductivity helps dissipate heat in high-temperature environments, avoiding local overheating.
Coefficient of Linear Expansion: 12.5×10⁻⁶/℃ at 20-100℃ and 16.28×10⁻⁶/℃ at 20-1000℃. When connected with other materials, the matching of their coefficients of linear expansion needs to be considered to avoid excessive thermal stress during temperature changes.
Magnetic Property: The alloy is non-magnetic, making it suitable for occasions with special magnetic requirements, such as some electronic equipment components in aerospace.
Mechanical Properties
High-Temperature Strength: It has high strength below 900℃. After solution treatment, the tensile strength (Rm) is ≥685MPa, the yield strength (RP0.2) is 270MPa, and the elongation (A5) is ≥40%, which can withstand the working stress of components such as aero-engines at high temperatures.
Fatigue Resistance: It has good fatigue resistance, enabling long-term stable operation under cyclic loads and improving the service life of components.
Creep Property: Under high temperature and stress, it has a low creep rate, which can effectively resist creep deformation and ensure the dimensional stability of components during long-term high-temperature operation.
Processing Performance
Hot Working Performance: During hot working processes such as hot forging and hot rolling, the alloy has good plasticity and fluidity, making it relatively easy to process into components of various shapes. However, it is necessary to control the processing temperature and rate to avoid defects such as cracks.
Cold Working Performance: Through cold working processes like cold rolling and cold drawing, the strength and surface quality of the alloy can be further improved, while higher dimensional accuracy and surface finish can be achieved, making it suitable for manufacturing some high-precision parts.
Welding Performance: It has good welding performance and can be joined using various welding methods, such as gas tungsten arc welding and gas metal arc welding. The welded joints have high strength and reliability.
Application Fields
Aerospace Field: It is a key material for components such as aero-engine combustion chambers and tail nozzles. It is also used in the manufacture of rocket engine thrust chambers, turbopumps, etc., and can serve as the support structure material for spacecraft thermal protection systems.
Energy Field: It has important applications in hot-end components of gas turbines, such as blades and combustion chambers. It can also be used in the manufacture of high-temperature reactors and heat exchangers in the petrochemical industry.
Other Fields: It is applied in high-temperature furnace rolls in the glass manufacturing industry, heat treatment furnace components in the metallurgical industry, etc. It can also be used to manufacture mechanical parts requiring high corrosion resistance and high-temperature strength.