Globular phase
Globular phase consists of spherical particles that offer higher toughness and lower anisotropy than acicular or lamellar structures.
Physical-chemical mechanism of action
The globular phase forms through the uniform balancing of atomic structure in the melt. The spherical particles have a homogeneous arrangement of atoms, which increases their mechanical strength.
Metallurgical relevance & risks in welding
Globular phase is desirable in weld joints because it offers higher toughness and lower anisotropy. Lack or insufficient globular phase can lead to reduced strength and increased risk of cracking.
Workshop practice & instructions
To promote globular phase, it is important to optimize the melting temperature and cooling schedule. Too rapid cooling can lead to acicular structures, while too slow cooling results in coarse grain formation and reduced toughness.