Abstract
Machining procedures of welding deposits are usual and result on cold work hardened surfaces. The cold work effect on cavitation erosion of an austenitic stainless steel surface is assessed. FeCrMnSiB coatings were processed by PTA on AISI 304 plates. Specimens were grouped as the cold work deformed surface (CWHS) and the undeformed polished surface (UPS) specimens. Top surface and transverse section of coatings were analysed for slip lines and hardness changes by light microscopy and Vickers microhardness measurements. Ultrasonic cavitation tests were conducted in accordance to ASTM G32-10. CWHS specimens exhibited slip lines and hardened surfaces while UPS specimens did not show traces of slip lines and had insignificant changes on microhardness. Cold work prior to cavitation indirectly increased the nominal incubation time and reduced the maximum erosion rate. Cold work increases the duration of the acceleration period postponing the onset of the maximum erosion rate and enhancing cavitation resistance.
Highlights
The surface of hydraulic machinery is often eroded by a mechanism named cavitation
This study aims to assess the effect of cold work deformed structures on the cavitation resistance of a FeCrMnSiB austenitic stainless steel coating and to contribute to the discussion on the effect of deformed structures on the cavitation erosion behavior
The analysis revealed the presence of slip lines at the surface and transversal section of CWHS specimens, as expected following cold work deformation
Summary
Cavitation erosion occurs when bubbles form in the liquid in regions where the absolute pressure is below its vapor pressure. Under these conditions bubbles collapse violently generating water jets and shock waves against the surface of parts[1]. According to the ASTM G32-10 standard, data distribution allows to identify the three stages of cavitation erosion, i. Notwithstanding, the boundaries of each stage can be diffuse, as perceived by the incubation period definition in the mentioned standard (the period in which the erosion rate is zero or negligible compared to other stages, A in Figure 1a and 1b), that leaves room for a subjective interpretation
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