Dislocation density evolution
The change in the number of lattice defects in metals due to plastic deformation or heat treatment. This affects the strength and hardness of the material.
Physicochemical Mechanism of Action
Dislocation density development describes how the number of lattice defects in metals changes. During plastic deformation, new defects are created (multiplication), while during heat treatment, existing defects disappear (annihilation).
Metallurgical Relevance & Welding Risks
Too high a dislocation density can increase strength and hardness, which can lead to cracking or wear issues. If the density is too low, the material stays softer and less tough.
Workshop Practice & Action Guidelines
To achieve an optimal dislocation density, control the deformation and heat treatment precisely. For steel, the deformation rate should be between 0.1% per second and 1% per second. The heat treatment time should be at least 30 minutes to ensure sufficient annihilation of defects.