1. What are the characteristics of GH4145 Superalloy?
: 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.
: After standard heat treatment (solution treatment + aging), two types of strengthening phases are precipitated in the alloy matrix:
: A metastable body-centered tetragonal phase, which is the primary strengthening phase, providing high room-temperature and medium-temperature strength.
: A face-centered cubic phase, which cooperates with the '' phase to enhance the alloy's high-temperature stability 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℃. This makes it suitable for key components such as aero-engine shafts, turbine disks, and rocket engine parts.
: 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.
: 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.
: It maintains stable performance in a wide temperature range from cryogenic (-253℃) to high temperature (650℃), making it applicable to both low-temperature and high-temperature working environments.
2.What is the yield strength of GH4145 Superalloy?
: The standard heat treatment for GH4145 to achieve optimal performance is "solution treatment (950-980℃, water cooling) + primary aging (720℃, holding for 8 hours, furnace cooling to 620℃) + secondary aging (620℃, holding for 8 hours, air cooling)".
Room Temperature (20℃)>=860 MPa.
:
At 400℃: Yield strength is about >=820 MPa.
At 500℃: Yield strength is about >=780 MPa.
At 600℃: Yield strength is about >=720 MPa.
At 650℃: 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℃)>=1275 MPa.
:
At 400℃: Tensile strength is about >=1170 MPa.
At 500℃: Tensile strength is about >=1080 MPa.
At 600℃: Tensile strength is about >=980 MPa.
At 650℃: Tensile strength is about >=860 MPa, maintaining excellent load-bearing capacity in high-temperature environments.
