Abstract
The influence of a duplex microstructure on fatigue crack growth in the near threshold region has been studied for AISI types 1018, 1045, and 10B35, as well as 2.25 Cr-1 Mo steels. For a duplex microstructure which consists of a continuous martensitic phase encapsulating ferrite, an increase in threshold level and yield strength in both the AISI 1018 and 2.25 Cr-1 Mo steels was observed. However, with increase in carbon content and consequent decrease in the volume of ferrite, the threshold levels were not as significantly affected, although the yield strengths were higher.
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