Nickel Alloy VZHL12U
General Technical Characteristics
VZHL12U is a heat-resistant cast nickel-based alloy designed for manufacturing gas turbine engine components operating under high temperatures and mechanical loads.
The alloy is primarily used to produce cast bar stock intended for subsequent remelting and the manufacture of rotor blades, nozzle components, and other shaped gas turbine castings.
The material belongs to the group of polycrystalline heat-resistant nickel alloys. Its structure consists of a nickel γ-matrix strengthened by γ′-phase precipitates and carbides. This structure provides a combination of strength, oxidation resistance, and resistance to long-term deformation.
Chemical Composition
Chemical composition of VZHL12U-VI according to OST 1 90126-85, wt.%:
| Element | Content, % |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 8.5–10.5 |
| Cobalt (Co) | 12.0–15.0 |
| Aluminium (Al) | 5.0–5.7 |
| Titanium (Ti) | 4.2–4.7 |
| Molybdenum (Mo) | 2.7–3.4 |
| Tungsten (W) | 1.0–1.8 |
| Niobium (Nb) | 0.5–1.0 |
| Vanadium (V) | 0.5–1.0 |
| Carbon (C) | 0.14–0.20 |
| Iron (Fe) | up to 2.0 |
| Silicon (Si) | up to 0.4 |
| Manganese (Mn) | up to 0.4 |
| Boron (B) | up to 0.015 |
| Zirconium (Zr) | up to 0.02 |
| Cerium (Ce) | up to 0.02 |
| Phosphorus (P) | up to 0.015 |
| Sulfur (S) | up to 0.015 |
The values refer specifically to grade VZHL12U-VI according to OST 1 90126-85. Boron, cerium, and zirconium are added in calculated amounts. Compliance of a specific batch must be verified using the quality certificate and applicable technical documentation.
Mechanical and Operating Properties
VZHL12U is characterized by the following properties:
- High strength at elevated temperatures.
- Resistance to creep and long-term deformation.
- Heat resistance and oxidation resistance.
- Structural stability during prolonged operation.
- Good castability and suitability for manufacturing cast billets.
For VZHL12U-VI, the reference mechanical requirements under OST 1 90126-85 include:
- Minimum tensile strength: 830 MPa.
- Minimum elongation: 5%.
- Minimum reduction of area: 7%.
These values apply to the testing conditions specified by the standard and should not be treated as universal properties for every supply condition.
Applications
Nickel alloy VZHL12U is used in the manufacture of:
- Gas turbine engine rotor blades.
- Turbine nozzle blades and guide components.
- Cast bar stock for subsequent remelting.
- Shaped castings for hot-section components.
- Components for aircraft and power-generation gas turbines.
Features of Nickel Alloy VZHL12U
The main advantage of VZHL12U is its combination of high-temperature strength, relatively low density, and good castability. Chromium improves oxidation resistance, aluminium and titanium contribute to the formation of the strengthening γ′ phase, while molybdenum, tungsten, and cobalt help increase strength at elevated temperatures.
Due to its multi-element alloying system, the material is suitable for manufacturing critical cast components that must retain their operating properties during prolonged exposure to high temperatures and mechanical loads.
Order Nickel Alloy VZHL12U from ASYNT.NET
ASYNT.NET offers heat-resistant nickel alloys for the aerospace, power generation, and engineering industries. Contact our specialists to уточнить availability, product form, dimensions, and delivery terms. The chemical composition and compliance of grade VZHL12U-VI must be confirmed by the material quality certificate.
