Degree of Work Hardening
The degree of cold working measures the increase in hardness and dislocation density in the surface layer due to plastic deformation. It increases abrasion resistance.
Physicochemical Mechanism
Cold working occurs through plastic deformation at cool or normal ambient temperatures. This leads to dislocation density and increases hardness in the surface layer.
Metallurgical Relevance & Welding Risks
A high degree of cold working can lead to increased hardness and improved abrasion resistance. However, it can also lead to increased stress buildup and possible cracking if the weld is not handled correctly.
Workshop Practice & Instructions
To control the degree of cold working, the following measures should be taken:
• Use a constant speed and pressure during peening or hammering.
• Make sure the weld is not overstressed to avoid stress buildup.
• After the process, check the surface for cracks or dislocations.