Glossary

What are transonic airfoils, and what is the active clearance control? Check out our technical dictionary and find out more about engine technology terms – from active clearance control to velocity triangle.

Phosphate treatment Plastic media blasting Powder metal (PM) components Pollutants Precipitation hardening Pressure ratio Principle of energy transfer Propfan Propulsion efficiency

Precipitation hardening

(at 800 - 1230°C)
Precipitation hardening improves the hardness and stress-rupture strength of titanium materials, precipitation-hardenable high-temperature steels as well as nickel and cobalt alloys. The process consists of a solution heat treatment followed by aging during which the constituents of the structure form a solid solution (mixed crystal) that is frozen during rapid cooling. The hardness increase is caused by the aging cycle.