1. What are the characteristics of GH4145 Superalloy?
Chemical Composition Core: Nickel (Ni) is the matrix element with a content of ≥50%, supplemented by chromium (Cr, 17-21%) for oxidation and corrosion resistance. The main strengthening elements include niobium (Nb, 4.75-5.50%), titanium (Ti, 0.65-1.15%), and aluminum (Al, 0.20-0.80%). Additionally, it contains small amounts of iron (Fe), molybdenum (Mo), and carbon (C) to optimize comprehensive performance.
Dual Precipitation Hardening Mechanism: After standard heat treatment (solution treatment + aging), two types of strengthening phases are precipitated in the alloy matrix:
γ'' phase (Ni₃Nb): A metastable body-centered tetragonal phase, which is the primary strengthening phase, providing high room-temperature and medium-temperature strength.
γ' phase (Ni₃(Ti, Al)): A face-centered cubic phase, which cooperates with the γ'' phase to enhance the alloy's high-temperature stability and creep resistance.
Excellent Fatigue and Creep Resistance: It exhibits outstanding fatigue strength, especially high-temperature fatigue performance, and can resist creep deformation under long-term loads at temperatures up to 650°C. This makes it suitable for key components such as aero-engine shafts, turbine disks, and rocket engine parts.
Strong Corrosion and Oxidation Resistance: The high chromium content forms a dense oxide film on the surface, which can resist corrosion from seawater, salt spray, and most acidic/alkaline media. It also maintains good oxidation resistance in high-temperature air.
Good Processability and Weldability: It has excellent cold and hot working properties, allowing for forging, rolling, extrusion, and machining into complex-shaped components. It also has good weldability, and the weld joint can maintain high strength after proper post-weld heat treatment.
Wide Temperature Adaptability: It maintains stable performance in a wide temperature range from cryogenic (-253°C) to high temperature (650°C), making it applicable to both low-temperature and high-temperature working environments.
2.What is the yield strength of GH4145 Superalloy?
Heat Treatment Basis: The standard heat treatment for GH4145 to achieve optimal performance is "solution treatment (950-980°C, water cooling) + primary aging (720°C, holding for 8 hours, furnace cooling to 620°C) + secondary aging (620°C, holding for 8 hours, air cooling)".
Room Temperature (20°C): Under the standard heat treatment state, the yield strength is approximately ≥860 MPa.
High Temperature (Typical Service Temperatures):
At 400°C: Yield strength is about ≥820 MPa.
At 500°C: Yield strength is about ≥780 MPa.
At 600°C: Yield strength is about ≥720 MPa.
At 650°C: Yield strength remains at approximately ≥650 MPa, which can meet the strength requirements of high-load components at the upper limit of service temperature.
3. What is the tensile strength of GH4145 Superalloy?
Room Temperature (20°C): Under the standard heat treatment state, the tensile strength is approximately ≥1275 MPa.
High Temperature (Typical Service Temperatures):
At 400°C: Tensile strength is about ≥1170 MPa.
At 500°C: Tensile strength is about ≥1080 MPa.
At 600°C: Tensile strength is about ≥980 MPa.
At 650°C: Tensile strength is about ≥860 MPa, maintaining excellent load-bearing capacity in high-temperature environments.
