White Layer, asset or liability?

The White Layer, or compound zone, is a thin surface layer formed during plasma nitriding through the reaction of nitrogen with iron in the steel. It is primarily composed of Fe₃N and Fe₄N, with thicknesses typically ranging from a few microns up to 25 microns depending on process conditions. This layer provides high surface hardness, reduced friction and improved corrosion resistance, but can also be more brittle than the underlying diffusion zone.

In this infographic: an in-depth look at the properties, advantages, limitations, and recommended applications of the White Layer.