Abstract
Fatigue crack growth in interstitially hardened 316L stainless steel has been investigated in air and 0.6M NaCl. Large compressive residual stresses introduced by “colossal” carbon supersaturation resulting from low temperature carburization increase the fatigue crack growth threshold from 8MPa√m to 10MPa√m, and retard the crack growth rate by a factor of two in the low stress intensity range. Fractography revealed no observable difference between the fracture surfaces of the bulk material and the hardened layer, either in air or the corrosive environment.
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