1. Overview

DD406 is a second-generation nickel-based single crystal high-temperature alloy developed in China. It offers several advantages, including:

• High Temperature Strength: Exceptional performance at elevated temperatures.
• Comprehensive Performance: Balanced properties across various conditions.
• Stable Microstructure: Maintains integrity during operation.
• Good Casting Processability: Facilitates manufacturing with favorable casting characteristics.

When compared to foreign second-generation single crystal high-temperature alloys such as PWA1484, Rene N5, and CMSX-4, DD406 demonstrates superior tensile properties, endurance performance, creep resistance, oxidation resistance, and thermal corrosion resistance. Additionally, it features a lower cost due to its reduced rhenium content. The alloys endurance strength makes it suitable for high-temperature components like gas turbine blades with complex inner cavities, operating below 1100 °C, and guide vanes functioning below 1150 °C.

2. Application Overview and Features

DD406 has been selected for the production of turbine blades and guide vanes in various advanced aircraft engines, undergoing testing across multiple platforms. The alloy has successfully completed test runs, flight tests, and the technical appraisal during the design finalization of a specific engine.

3. Material Technical Standards

• GB/T 14992: Classification and designation of high-temperature alloys and intermetallic compound high-temperature materials
• Q/6S 1678: DD6 alloy ingot

4. Melting and Casting Process

The master alloy is melted in a vacuum induction furnace and subsequently remelted in a vacuum directional solidification furnace to produce single crystal castings or test bars.

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