Surface condition and fatigue properties of spring steel wire
Excellent surface condition and fatigue performance: spring work surface stress, and fatigue damage is often started from the wire surface, for the spring used in important occasions, such as car engine valve springs generally require fatigue life of 2.3 × 107 times to 3.0 × 107 times, medium and high-grade car suspension springs are generally required to 2.0 × 106 times to 5.0 × 106 times or even longer fatigue Life, which puts forward high requirements on the fatigue performance of the material. Many factors affect the fatigue properties of materials, such as the chemical composition of the material, hardness, purity of steel, surface quality and metallurgical organization, etc., especially important is the surface quality of the material. Material surface defects, such as cracks, folding, scale, rust, pits, scratches and indentations, etc., are easy to make the spring in the working process caused by stress concentration. The site of stress concentration is often the source of fatigue damage caused by fatigue. Fatigue source is also easy to surface decarburization of the first part of the occurrence, so strictly control the depth of decarburization layer is also a very important quality indicators. In order to improve the surface quality of the spring material, the surface of the material can be ground or polished, in the steel wire drawing before the peeling process to remove a layer of material skin, so that most of the surface defects can be removed. Spring heat treatment can be used to control the atmosphere or vacuum heat treatment to prevent surface decarburization and oxidation.
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