Heat-Resistant Nickel Alloys DD405 / DD419

General Technical Characteristics

DD405 and DD419 are high-temperature, single-crystal nickel-based superalloys developed for manufacturing critical gas turbine engine components. These materials are designed to operate under high temperatures, significant centrifugal forces, and prolonged mechanical loads.

DD405 belongs to the second-generation single-crystal heat-resistant alloys. DD419 is also used in high-temperature turbine components and combines heat resistance, creep resistance, and structural stability. The operating properties of these materials are based on a nickel matrix strengthened by the γ′ phase, together with alloying elements such as chromium, cobalt, tungsten, aluminum, and others.

Chemical Composition

Typical nominal chemical composition of DD405, wt.%:

• Nickel (Ni) — balance;
• Chromium (Cr) — approximately 6.0–7.5%;
• Cobalt (Co) — approximately 7.0–8.0%;
• Molybdenum (Mo) — approximately 1.0–2.0%;
• Tungsten (W) — approximately 4.0–6.0%;
• Aluminum (Al) — approximately 6.0–7.0%;
• Tantalum (Ta) — approximately 6.0–7.0%;
• Rhenium (Re) — approximately 2.0–4.0%;
• Hafnium (Hf) — approximately 0.10–0.20%;
• Carbon (C) — approximately 0.02–0.08%;
• Boron (B) — present in small quantities.

Typical chemical composition of DD419, wt.%, according to published experimental data:

• Nickel (Ni) — balance;
• Chromium (Cr) — approximately 6.4%;
• Cobalt (Co) — approximately 9.5%;
• Molybdenum (Mo) — approximately 0.6%;
• Tungsten (W) — approximately 6.4%;
• Aluminum (Al) — approximately 5.6%;
• Titanium (Ti) — approximately 1.0%;
• Tantalum (Ta) — approximately 6.5%;
• Rhenium (Re) — approximately 3.0%;
• Hafnium (Hf) — approximately 0.1%.

Aluminum, titanium, and tantalum contribute to the formation of the strengthening γ′ phase. Tungsten and rhenium help improve creep resistance, while chromium contributes to resistance against high-temperature oxidation.

The values listed above are indicative. The chemical composition of DD405 and DD419 may vary depending on the applicable standard, manufacturing process, and specific specification. The exact composition should be verified against the manufacturer’s technical documentation and the batch quality certificate.

Mechanical and Operating Properties

The main characteristics of DD405 and DD419 include:

• High strength at elevated temperatures;
• Resistance to creep and long-term rupture;
• Strengthening through the γ′ phase;
• Ability to withstand prolonged mechanical and thermal loads;
• Suitability for manufacturing complex-shaped single-crystal cast components;
• Operational stability when heat treatment and service requirements are properly observed.

Actual mechanical properties depend on the alloy grade, casting technology, crystal orientation, heat treatment, and operating conditions. Confirmed data for the specific modification should be used for engineering calculations.

Applications

DD405 and DD419 nickel-based alloys are used to manufacture:

• Gas turbine rotor blades;
• High-pressure turbine blades;
• Aircraft gas turbine engine components;
• Power-generation gas turbine parts;
• Single-crystal cast components for engine hot sections;
• Critical components exposed to high temperatures and prolonged mechanical loads.

The choice of a specific grade depends on the required heat resistance, creep resistance, chemical composition, and component manufacturing technology.

Features of DD405 / DD419 Alloys

• Single-crystal structure for high-temperature applications.
• Strengthening through the γ′ phase.
• Alloying with elements that improve resistance to prolonged mechanical loads.
• Application in critical gas turbine equipment components.
• Requires compliance with casting, heat treatment, and operating requirements.

When selecting DD405 or DD419, it is important to consider the differences in chemical composition and properties between these grades. Before use, the material should be checked for compliance with the technical requirements of the specific component.

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