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1. GH163 (GH4163) Overview
GH163 (GH4163) is a nickel-based precipitation-hardened superalloy that balances high-temperature strength, fatigue life, and structural stability up to 800°C. Cobalt strengthens the matrix while aluminum and titanium form nano‑sized γ′ precipitates. This combination delivers the high stress, cyclic load, and long‑term thermal stability required in hot‑section rotating components.
2. Chemical Composition (wt%) of GH163
| Element | Content (%) | Role |
|---|---|---|
| C | 0.04–0.08 | Grain boundary strengthening |
| Cr | 19.00–21.00 | Oxidation & hot corrosion resistance |
| Co | 19.00–21.00 | Solid‑solution strengthening, microstructural stability |
| Mo | 5.60–6.10 | Solid‑solution strengthening |
| Ti | 1.90–2.40 | γ′ precipitate former |
| Al | 0.30–0.60 | γ′ precipitate former |
| Ni | Balance | Matrix |
| Mn | ≤0.60 | Residual |
| Si | ≤0.40 | Residual |
| P | ≤0.015 | Impurity control |
| S | ≤0.007 | Impurity control |
3. GH163 (GH4163) Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 8.35 |
| Magnetism | Non‑magnetic |
| Thermal conductivity (W/(m·K), 100–900°C) | 12.56 – 30.14 |
| Electrical resistivity (Ω·mm²/m, 20°C) | 1.209 |
| Coefficient of linear expansion (10⁻⁶/K, 25–700°C) | 15.4 |
4. GH4163 Mechanical Properties
After standard solution + two‑stage aging, GH163 provides superior room‑temperature strength and retains excellent stress‑rupture and fatigue properties at 800°C. Compared with solid‑solution strengthened alloys in its temperature class, GH163 offers >40% higher high‑temperature yield strength and a lower fatigue crack growth rate—essential for rotating components under centrifugal and alternating loads.
| Condition | Test Temp. | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Stress Rupture |
|---|---|---|---|---|---|
| Solution + Aged | Room Temp. | ≥1230 | ≥830 | ≥18 | – |
| Solution + Aged | 800°C | ≥760 | ≥520 | – | ≥100 h @ 340 MPa |
5. Core Performance Advantages
5.1 High‑Temperature Strength & Fatigue Resistance
Cobalt solid‑solution strengthening combined with γ′ precipitation gives GH163 top‑tier yield strength and fatigue performance at 800°C. Uniform grains and clean grain boundaries slow fatigue crack initiation and propagation, ensuring reliable service under centrifugal and alternating stresses.
5.2 Structural Stability & Oxidation Resistance
High cobalt content suppresses the formation of detrimental phases (σ, μ) during long‑term aging at 700–800°C. High chromium promotes a dense Cr₂O₃ protective film, delivering excellent static and cyclic oxidation resistance up to 850°C.
6. Heat Treatment
- Solution treatment: 1160–1180°C, hold 1–2 h (section‑dependent), air cool. Dissolves precipitates for a uniform grain structure.
- Aging: Two‑stage aging maximizes γ′ precipitation hardening.
7. Processing & Welding
- Hot working: Forge/roll at 1050–1170°C; initial ≤1170°C, final ≥980°C. Slow‑cool large forgings to relieve stress.
- Cold forming: Perform stamping, bending, or drawing in the solution‑annealed condition; use intermediate annealing between high‑deformation steps.
- Welding: Use low‑heat‑input GTAW/TIG or EBW with matching‑grade filler wire.
8. Typical Applications
- Aero‑engine hot‑section rotating parts: turbine discs, compressor discs, blade tenons, high‑temperature fasteners (≤800°C).
- Industrial gas turbines: turbine discs, guide vanes, combustion chamber support rings, high‑temperature bolts—longer life than conventional solid‑solution alloys.
- High‑end equipment: aerospace vehicle power systems, high‑temperature test fixtures, nuclear‑grade high‑temperature valves, advanced heat‑treatment fixtures.
Supply & Support
C&N supplies hot‑rolled bars, forgings, seamless pipes, and custom‑sized products with full material test reports and heat‑treatment records. Technical support from material selection through welding assistance is available.
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