Scatter of fatigue life
Scatter of fatigue life refers to the statistical variance of the number of cycles to failure under identical loading conditions, resulting from material inhomogeneities.
Physical-Chemical Mechanism of Action
Service life of a workpiece is the time it remains functional under certain loads. Scatter in service life results from microscopic differences in the material, such as varying grain sizes or chemical compositions. These inhomogeneities influence the formation of crack areas and other microstructures under load.
Metallurgical Relevance & Welding Risks
High scatter in service life can lead to unpredictable failure. Inhomogeneities in the material can cause different behavior under load, posing risks to the safety and reliability of the component. In welding, it is especially important that the microstructure stays homogeneous and uniform to ensure consistent service life.
Shop Practice & Action Items
To minimize scatter in service life, take the following measures:
• Use highly homogenized materials with low inhomogeneity.
• Ensure that welding is done at optimal temperatures and times for uniform microstructure formation.
• Check material properties regularly and run quality control.