Gas Turbine Ring Disk Microstructure Optimization

The patent applies local quality by creating a non-uniform distribution of δ phase particles within the ring-shaped disk. Specifically, the concentration and orientation of δ phase particles are optimized in different regions (radial, tangential, and axial directions) to provide enhanced strength where needed most, particularly in areas subjected to highest centrifugal forces and thermal stresses. This local microstructural optimization allows the disk to withstand higher loads without requiring a complete redesign of the entire structure.

The patent utilizes composite material principles by creating a multi-phase microstructure consisting of γ matrix phase and δ precipitate phase. This composite microstructure at the microscopic level provides synergistic properties: the γ matrix provides ductility and toughness while the δ phase provides strength and creep resistance. The controlled distribution and orientation of these phases create a composite material system that achieves the required high strength for larger disk sizes.

The patent applies parameter changes by modifying the microstructural parameters (δ phase particle concentration, size, and orientation) through controlled rolling processes rather than changing the macroscopic manufacturing method from rolling to die forging. By adjusting parameters such as rolling temperature, rolling reduction ratio, and heat treatment conditions, the patent achieves high strength properties through microstructural control, avoiding the need for expensive large-capacity die forging equipment.

The patent substitutes the mechanical system of die forging with a rolling process combined with microstructural control. Instead of using high-tonnage die forging machines to achieve strength, the patent uses rolling mills with controlled microstructural evolution during deformation. This substitution replaces expensive mechanical forging systems with more economical rolling equipment while achieving comparable or superior strength through microstructural optimization.