Thermally Induced Residual Stresses of the Third Kind
Thermally induced residual stresses of the third kind arise from atomic distortions near lattice defects and dislocation cores. They affect the microstructural energy level.
Physical-Chemical Mechanism of Action
Thermally induced residual stresses of the third kind arise from atomic distortion near lattice defects and dislocation cores. These distortions create microscopic stress fields that affect the energy level of the microstructure.
Metallurgical Relevance & Welding Risks
These stresses can lead to submicroscopic cracks and deformations. They increase susceptibility to hot cracking and reduce the mechanical toughness of the weld. Improper cooling procedures or inadequate mechanical treatment can amplify these stresses.
Workshop Practice & Procedures
To minimize thermally induced residual stresses of the third kind, ensure controlled cooling and adequate mechanical treatment after welding. Use a homogeneous cooling medium and avoid rapid cooling phases. During mechanical treatment (e.g., stress relieving), apply uniform pressure and sufficient duration to release stresses.