Phosphorus Grain Boundary Embrittlement

Physicochemical Mechanism of Action

Phosphorus grain-boundary embrittlement is a process where phosphorus concentrates at the grain boundaries of the steel. This reduces the impact energy and makes the material softer and more deformable.

Metallurgical Relevance & Welding Risks

This embrittlement can lead to an increased susceptibility to cracking and deformation, especially at high temperatures or under prolonged loading. It can also make the steel less tough.

Workshop Practice & Action Instructions

To avoid phosphorus grain-boundary embrittlement, cool the weld as quickly as possible. At high tempering temperatures, it is important that the steel is cooled in a protected environment to ensure uniform cooling.