Interfacial Energy
Phase boundary energy is the energy released during the formation of a phase boundary. It influences the occurrence of nucleation and the stability of low-alloy steels.
Physical-Chemical Mechanism of Action
Interfacial energy is created by the attractive forces between atoms of different phases. These forces try to form a homogeneous phase, which costs energy.
Metallurgical Relevance & Risks in Welding
High interfacial energy can promote nucleation and affect the stability of low-alloy steels. This can lead to unwanted phase transformations and weak spots that compromise the strength of the weld.
Workshop Practice & Instructions
To achieve low interfacial energy, it's important to carefully control the melting temperature and cooling steps. Use appropriate deoxidizers and protect the weld from corrosion. For high-alloy steels, high interfacial energy can lead to hot cracking, so slow cooling is required.