Yield strength symmetry
Yield strength symmetry means that a metal has the same yield strength under tensile and compressive loading. Deviations indicate uneven microstructure or stresses.
Physical-chemical mechanism of action
Yield strength is the stress value at which a metal flows plastically. For ideal materials, these limits are the same under tension and compression. Deviations indicate uneven stress distribution or a non-homogeneous microstructure.
Metallurgical relevance & risks during welding
Deviating yield strengths can lead to uneven strains and stresses, causing cracks or deformation. This is especially relevant for complex components with different loading conditions.
Workshop practice & instructions
Check yield strengths under tension and compression through specific tests. If deviations are found, analyze the microstructure and reduce possible stresses, e.g., by careful pre-treatment or an optimized welding procedure.