Laves phase
The Laves phase is a dense intermetallic phase in steels that precipitates at high temperatures. Excessive precipitation leads to low long-term toughness.
Physical-Chemical Mechanism of Action
The Laves phase forms through a special combination of metals that grow together in the melt. It is dense and has special properties that cause it to precipitate in steel at high temperatures.
Metallurgical Relevance & Welding Risks
Precipitation of the Laves phase can lead to reduced long-term toughness. This means the steel becomes weaker under load over time and may crack earlier. Additionally, it can affect weld integrity by altering the microstructure.
Workshop Practice & Action Guidelines
To minimize the Laves phase, it is important to ensure optimal temperature and time control during welding. Use appropriate welding methods and materials that reduce this phase. With high-alloy steels, be especially careful and control melting time and cooling.