Abstract
Fractures occurring in the fabrication and use of springs of high carbon and stainless steel strip are discussed. Reasons for failure during spring forming are e.g. coarse microstructure, overrolling and hydrogen embrittlement. Fatigue, wear and corrosion may lead to failure of springs in use. Studies in a compressor valve simulator, SIFT, show that stainless chromium steel is superior to carbon steel regarding impact fatigue properties. Influence of static strength, microstructure, surface and edge condition on the bending and tensile fatigue strength is described. In a 13% Cr steel oxide inclusions of about 15 urn size close to the surface initiate early (<2×106cycles) fatigue cracks and interior, larger oxides start cracks at a later stage.
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