Aerospace & Defense

🔥 Low-Pressure Turbine Blades (Gamma-TiAl)

Thin-wall hollow or solid aerofoil with complex internal cooling passages (or solid for LPT), fir-tree root attachment

Design Principles

Material: Gamma-TiAl (Ti-48Al-2Cr-2Nb) offers 50% weight reduction vs Ni-based superalloys while maintaining adequate strength up to 750C. Enables lighter turbine rotors and reduced disc loading.

Form: Investment casting is the primary forming method for Gamma-TiAl blades due to the materials low ductility and difficulty in forging. HIP + heat treatment follows casting.

Engineering Trends

  • Process: Investment casting
  • Process: Hot isostatic pressing (HIP)
  • Process: Precision grinding of root form

Standards Reference

Standards: AMS 6900 / ASTM F3069, investment cast + HIP, 100% X-ray + FPI, creep sample per batch

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