1. What are the characteristics of GH3030 Superalloy?
Outstanding High-Temperature Stability: It maintains structural integrity and mechanical properties at temperatures up to 800–900°C (1472–1652°F). Even under long-term exposure to high temperatures, it resists oxidation, carburization, and nitridation, making it suitable for high-heat applications like turbine components and furnace parts.
Excellent Mechanical Strength: It exhibits high tensile strength, yield strength, and fatigue strength at both room and elevated temperatures. This strength is primarily derived from precipitation hardening (e.g., formation of γ' phase, Ni₃(Al, Ti)) during heat treatment, which enhances its load-bearing capacity.
Good Corrosion and Oxidation Resistance: The high chromium content (typically 14–17%) in its composition forms a dense, adherent chromium oxide (Cr₂O₃) film on the surface, effectively isolating the alloy from corrosive media (such as acidic or alkaline solutions) and oxidizing atmospheres.
Favorable Processability: It can be processed via common manufacturing methods, including hot forging, cold rolling, extrusion, and welding. However, due to its high strength, appropriate heat treatment (e.g., solution annealing, aging) is often required to adjust its hardness and ductility for specific processing needs.
Stable Chemical Composition: Its main chemical components include nickel (Ni, ~70%), chromium (Cr, 14–17%), iron (Fe, ~5–9%), titanium (Ti, 2.25–2.75%), aluminum (Al, 0.4–1.0%), and small amounts of carbon (C) and manganese (Mn). This composition balances high-temperature performance and room-temperature ductility.
2. What is the yield strength of GH3030 Superalloy?
Room Temperature (25°C/77°F):
In the aged state (common for service applications), the yield strength ranges from 690 MPa to 830 MPa (100,000–120,000 psi). This high yield strength is attributed to the precipitation of γ' (Ni₃AlTi) phases, which impede dislocation movement.
In the solution-annealed state (for processing purposes), the yield strength is lower, typically around 345 MPa to 480 MPa (50,000–70,000 psi), as the alloy remains in a softer, solid-solution phase.
Elevated Temperatures:
At 600°C (1112°F), the yield strength is approximately 480–550 MPa (70,000–80,000 psi) (aged state).
At 800°C (1472°F), the yield strength decreases to around 170–240 MPa (25,000–35,000 psi) (aged state), but it still retains sufficient strength for high-temperature service.
3. What is the tensile strength of GH3030 Superalloy?
Room Temperature (25°C/77°F):
Aged state: Tensile strength ranges from 965 MPa to 1100 MPa (140,000–160,000 psi). This high tensile strength makes it suitable for load-bearing components in harsh environments.
Solution-annealed state: Tensile strength is lower, usually between 690 MPa and 830 MPa (100,000–120,000 psi), as the alloy lacks the strengthening effect of precipitated phases.
Elevated Temperatures:
At 600°C (1112°F) (aged state): Tensile strength is approximately 760–830 MPa (110,000–120,000 psi).
At 800°C (1472°F) (aged state): Tensile strength drops to around 275–345 MPa (40,000–50,000 psi), but this is still adequate for applications like gas turbine combustors or heat exchanger tubes.
