Abstract
In this study fatigue crack growth rates have been determined for different microstructural conditions in a 13 pct chromium steel. Although all treatments resulted in varying microstructures, it was possible to obtain two pairs of treatments that had two different yield strengths but the same value within each pair. It has been concluded that neither microstructure nor the yield strength alone governs the fatigue crack growth rates in stage II. The operative fracture mechanisms play an important role in determining the material resistance to fatigue crack growth.
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