Two-phase region
In the two-phase region, two phases coexist in chemical equilibrium. The proportions are calculated using the lever rule.
Physikalisch-chemischer Wirkmechanismus
In a two-phase region, two different phases exist, such as liquid and solid. These phases are in chemical equilibrium and share the available material. The proportions of each phase can be determined by the lever rule, which states that the product of the partial pressures with the corresponding volume fractions is constant.
Metallurgical Relevance & Welding Risks
In the two-phase region during welding, different microstructures and properties can develop, depending on composition and cooling pattern. Incorrect cooling can lead to uneven phase boundaries, which can result in mechanical cracks or toughness loss in the weld area.
Werkstattpraxis & Handlungsanweisungen
To effectively manage the two-phase region and achieve the desired weld properties, it is important to apply controlled cooling. This can be done by choosing the right shielding gas or by using special cooling methods like quenching (rapid cooling). The exact cooling curve and temperature limits must be precisely maintained depending on the material and application.