Abstract
Dual-phase steels having martensite contents ranging from 24 to 100% were produced by quenching sheets of a low-carbon (∼0.1 weight%) vanadium-bearing steel from various temperatures in the intercritical (α + γ) and austenite phase regions. Fatigue properties of these materials were determined by constant amplitude testing of both smooth and notched specimens. It was found that, while monotonic strengths increase continuously with increasing martensite contents, cyclic strengths increase only to about 30% martensite; dual-phase steels containing less than 30% martensite cyclically harden while those with higher a martensite content soften. Similar results were obtained for strain/life behaviour, ie, improvements in life by increasing martensite content only up to 30%. In contrast to monotonic behaviour the observed variation of cyclic mechanical properties with martensite content cannot be explained by a simple rule-of-mixtures. Fatigue notch sensitivity was found to increase with increasing martensite content.
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