Characteristics of Waterjet Cavitation Erosion of 304 Stainless Steel After Corrosion in NaCl Solution
LIU Haixia(), CHEN Jinhao, CHEN Jie, LIU Guanglei
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
Cite this article:
LIU Haixia, CHEN Jinhao, CHEN Jie, LIU Guanglei. Characteristics of Waterjet Cavitation Erosion of 304 Stainless Steel After Corrosion in NaCl Solution. Acta Metall Sin, 2020, 56(10): 1377-1385.
The 304 stainless steel specimens were corroded in 3%NaCl solution, and then cavitation erosion experiments were performed on these specimens using an experimental rig that conformed to the ASTM G134 standard. The effects of both the corrosion time and erosion time on cavitation erosion were analyzed. The cavitation erosion characteristics were described via the mass loss, surface microstructure, three-dimensional surface morphology and microhardness. The results show that for the specimen corroded for 24 h, the stage of cavitation erosion attenuation commences at the cavitation erosion time of 120 min. In the early stage of cavitation erosion, erosion pits manifest small size and depth. In the later stage of cavitation erosion, the plastic deformation is intensified and large erosion pits are abundant. Microcracks expand along grain boundaries. Eventually, the interconnection between erosion pits incurs peeling-off of grain boundaries. The surface roughness increases with the cavitation erosion time. Compared to the corroded specimens, the non-corroded specimen demonstrates higher surface roughness after cavitation erosion. As the corrosion time increases from 24 h to 120 h and the cavitation erosion time is remained at 120 min, the plastic deformation is strengthened and microcracks emerge at grain boundaries. The 3%NaCl solution helps to suppress cavitation erosion. Nevertheless, as the corrosion time increases, the suppression effect attenuates.
Fig.1 Schematic of the cavitating waterjet erosion experimental rig
Fig.2 Image of the test chamber
Fig.3 Cumulative mass loss (Δm) at different standoff distances (t—cavitation erosion time)
Fig.4 Surface morphologies of the specimens before (a) and after corrosion for 24 h (b) and 120 h (c)
Fig.5 Variations of cumulative mass loss and cumulative mass loss rate (ER) with cavitation erosion time (t)
Fig.6 SEM images of surface microstructures at different cavitation erosion time (a) 60 min (b) 120 min (c) 240 min (d) 360 min
Fig.7 Three-dimensional surface morphologies at different cavitation erosion time (unit: μm) Color online (a) 60 min (b) 120 min (c) 240 min (d) 360 min
Fig.8 Variation of surface roughness (Sa) with cavitation erosion time
Fig.9 Comparison of the variation of microhardness with depth in cross section of specimen between corroded and non-corroded specimens
Fig.10 Surface microstructures of specimens after cavitation erosion for 120 min without corrosion (a) and with corrosion of 120 h (b)
Fig.11 Three-dimensional surface morphologies after cavitation erosion for 120 min without corrosion (a) and with corrosion of 120 h (b) (unit: μm) Color online
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