Residual Stress of the Third Kind
Residual stress of the third kind arises near lattice defects, vacancies, or dislocations and reflects atomic irregularities. It influences the mechanical properties of the material.
Physical-Chemical Mechanism of Action
Residual stress of the third kind occurs when the crystal lattice becomes distorted around atomic defects such as vacancies or dislocations. These local stresses arise from the attraction and repulsion of atoms near the defect.
Metallurgical Relevance & Risks in Welding
Residual stress of the third kind can lead to increased hardness and toughness in the area of lattice defects. This can lead to crack-sensitive microstructure development and reduced formability, especially in fine lattice structures. With incorrect welding treatment, these stresses can lead to hot cracks or swelling risks.
Shop Practice & Action Instructions
To minimize the impact of residual stress of the third kind, it is important to carry out careful welding treatment. This includes controlled cooling and appropriate post-weld heat treatment. For high-hardness steels or fine lattice structures, special attention must be paid to hardness control.