Abstract
This study shows the effect of strain-induced martensitic transformation (austenite (γ)–to–martensite (α′)) on the cavitation erosion resistance of a Fe-Cr-C-Al-Ti deposited layer with a high share of metastable austenite in the structure. For comparison, the cavitation erosion of a E308L-17 deposited layer and an AISI 316L stainless steel substrate was also evaluated. Cavitation tests were performed using a modified ultrasonic tester. X-ray diffraction (XRD) was used to examine martensitic phase transformation. An optical microscope (OM), a scanning electron microscope (SEM), and a 3D optical profilometer were utilized to evaluate the eroded specimens' surfaces. The chemical composition of the Fe-Cr-C-Al-Ti deposited layer was analyzed using an energy-dispersive microanalysis system (EDS). The cavitation results revealed that the Fe-Cr-C-Al-Ti specimen exhibited a resistance to cavitation erosion approximately 4 and 10 times higher than the E308L-17 and AISI 316L specimens, respectively. As shown, effects of γ → α′ transformation were mainly responsible for the results.
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