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Enhanced fatigue resistance in 316L austenitic stainless steel due to low-temperature paraequilibrium carburization

Authors
Publisher
Elsevier Ltd
Publication Date
Volume
55
Issue
16
Identifiers
DOI: 10.1016/j.actamat.2007.06.025
Keywords
  • Fatigue
  • Austenitic Steels
  • Carburization
  • Internal Stresses
  • Tension Test

Abstract

Abstract Fully reversed fatigue tests have been performed on wrought 316L stainless steel samples after low-temperature carburization. The resulting 25 μm case depth, with a surface hardness three times that of the core and a surface compressive stress greater than 2 GPa, leads to significantly enhanced fatigue performance. The so-called endurance limit (defined as the stress at which the fatigue life is 10 7 cycles) increased from about one-third to about one-half the yield stress (from ∼200 to ∼325 MPa). Fractographic investigations reveal that the surface stresses change the preferred site of fatigue crack nucleation from the surface for noncarburized samples to the interior for carburized samples.

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