On the high cycle fatigue behavior of duplex stainless steels: Influence of thermal aging

摘要: Abstract In this investigation the high cycle fatigue (HCF) behavior of an austenite-ferrite duplex stainless steel (DSS) is studied as a function aging at 475 °C. It found that HCF strength and sensitivity DSS increase with aging. The improvement results from higher cyclic yield stress spinodally-hardened ferrite which induces increasing difficulty for early propagation, into through ferritic matrix, microcracks nucleated within austenite. impairment suggested to be correlated easier microcrack nucleation stage in aged compared annealed or unaged one.