Diffusionless Phase Transition
Diffusionless phase change is a rapid transformation from one metal lattice to another without thermal diffusion. This enables high transformation speeds and minimizes the risk of cracks.
Physical-Chemical Mechanism of Action
The diffusionless phase change (DPB) is based on rapid flipping of the atomic lattice structure. This occurs by applying strong mechanical forces that excite atoms and change their positions without requiring thermal diffusion.
Metallurgical Relevance & Welding Risks
DPB is especially important in fusion welding because it enables fast and precise transformation of the metal. This reduces the time during which the metal is susceptible to cracks or deformations. However, uncontrolled DPB can lead to uneven hardness distribution, which can cause damage like tooth cracks or fracture forces.
Workshop Practice & Action Instructions
To successfully use diffusionless phase change, it's important to precisely control welding speed and temperature profile. In fusion welding, consider using stabilized electrolytes or special welding materials to ensure uniform transformation.