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.

Scanning electron microscopy Shaped holes Shot peening Silencer Silver-plating Single-crystal turbine blades Skeleton line Slurry coatings Soft annealing Solid-film lubricants Specific work of a stage Stage Steel shot peening STEM drilling

Straight cascade Stress-relieving Sulphuric acid DC anodizing Supersonic aircraft

Soft annealing

(at 700 - 900°C)
Soft annealing serves to reduce the material hardness for some processing steps, such as machining or forming. In some steels soft annealing also changes the shape of the carbides.