Phase Transformation
Microstructure transformation is the process where a metal's crystal structure changes under the influence of temperature and mechanical stresses. This affects mechanical properties like hardness, toughness, and formability.
Physical-Chemical Mechanism of Action
Phase Transformation is a process where the crystal structure of a metal changes under the influence of temperature and mechanical stresses. This can be caused by melting, cooling, or mechanical deformation.
Metallurgical Relevance & Risks in Welding
Phase Transformation is of great importance for the mechanical properties of the weld. For example, martensite, a hard and crack-sensitive structure, can form during rapid cooling, which increases hardness but reduces toughness. Uneven cooling can lead to stresses that may cause cracks.
Workshop Practice & Instructions
To achieve optimal Phase Transformation, it is important to keep the welding process under strict control. This includes adhering to the correct temperature and cooling time (t8/5) to obtain a balanced structure. For heavy steels or under high stresses, continuous cooling is required to avoid cracks.