Abstract
The effects of friction stir processing (FSP) on the fatigue crack growth (FCG) behavior of super duplex stainless steel (SDSS) SAF 2507 was investigated. Both base metal (BM) and friction stir processed (FSPed) compact tension (CT) samples were fatigue tested under constant amplitude load; at a stress ratio (R) of 0.1 and frequency of 10 Hz. Crack length was monitored using a video camera. The crack growth behavior for both BM and FSPed CT specimens was characterized using stress intensity factor and the J-integral computed using elastic-plastic finite element analysis (FEA). Optical and scanning electron microscopes (SEM) were used to analyze the fracture surfaces. The results of this study show that FSPed specimens have higher fatigue crack growth (FCG) resistance and fatigue life as compared to base material. In addition, the crack propagation under the above-mentioned conditions has revealed changes in fracture mechanisms, due to FSP. The microscopic analyses of the fracture surface of FSPed specimens revealed numerous crack initiations sites and complicated crack propagation paths which contributed to the retardation of the crack propagation.
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