Recrystallization Threshold
The recrystallization threshold is the minimum degree of deformation at which new grain formation begins during heat treatment. Below this value, the material remains undeformed.
Physical-Chemical Mechanism of Action
The recrystallization threshold is the minimum strain a metal must have to start forming new grains during heat treatment. This value depends on the material's properties and tells you when the material can restore its original crystal structure.
Metallurgical Relevance & Risks in Welding
If a metal's strain stays below the recrystallization threshold, you get a coarse structure. This can lower mechanical properties and make the metal crack-prone. If the strain is above critical, new grain formation can happen successfully, which boosts strength.
Workshop Practice & Procedures
To make sure the material recrystallizes properly after welding, you need to control the strain during welding. You can do this by picking the right welding process and heat treatment. For metals with a high recrystallization threshold, you really need to watch the strain to get uniform new grains.