Additive Manufacturing, also referred to as 3D Printing, is a technology that produces three-dimensional parts layer by layer from a material, be it polymer or metal-based.
Controlled nitriding/nitrocarburizing imparts a high surface hardness which results in a higher resistance to wear, scuffing, galling, seizure, and an improvement in corrosion.
Age hardening or precipitation hardening (also known as aging) is a change in material properties (generally hardening) effected by holding parts at moderately elevated temperatures, without any change in the chemistry of the alloy.