Phase Boundary Energy
The phase boundary energy is the energy that occurs at the contact surface between two different crystal phases. It influences the growth and coalescence of precipitates.
Physico-Chemical Mechanism
Grain-boundary energy is the energy at the interface between two different crystal phases. This energy keeps phases apart and affects the growth and coalescence of precipitates.
Metallurgical Relevance & Welding Risks
High grain-boundary energy can slow down precipitation, hurting weld strength. It can also prevent precipitates from coalescing properly, leading to coarse, uneven grains that worsen mechanical properties.
Shop Practice & Action Items
To get optimal precipitation and coalescence, control welding parameters like temperature and time precisely. Too fast cooling may not reduce grain-boundary energy enough, causing uneven grains and poor properties. Too slow cooling can make precipitates coalesce too slowly, coarsening the weld.