Abstract
The paper presents cavitation erosion testing results of three stainless steels that may be used in making hydropower turbine parts. Two of these steels have a chemical composition close to that of some other stainless steels previously employed in producing these parts. They are updated steel grades of the former ones. The third one is newly conceived. Aiming better mechanical and corrosion resistance characteristics as well as an inclusion - free structural state, steels were produced in an induction furnace with cold copper crucible under vacuum and argon atmosphere. Quenching and tempering heat treatments were subsequently applied.
Highlights
The paper presents cavitation erosion testing results of three stainless steels that may be used in making hydropower turbine parts
The cavitation erosion testing setup consists of the present because compounds which it favors generate the precipitation of the highest hardening eNffie3Tcti following systems: Hielscher UP200St electronic ultrasonic generator; oscillation system; vessel for the cavitant fluid provided with copper spiral cooling system continuously cooled with water
Characterization of cavitation erosion damage was achieved by plotting the diagrams of the eroded mass and the cavitation erosion rate versus time, by atomic force microscopy (AFM) on a NANONICS IMAGING MultiView 4000SPM/NSOM microscope in order to characterize the topography of surfaces damaged by cavitation, and scanning electron microscopy (SEM) on a FEI Quanta 450 FEG microscope to highlight the effects of the cavitation phenomenon on the surface integrity of the tested materials
Summary
Three steel ingots with the chemical composition vibration method, as against to the vibration method with shown in table 3 were obtained. P1 and P2 steels have a the sample attached to the sonotrode [18], is the reduced martensitic - ferritic structure and P3 a martensitic - intensity of the cavitation erosion, leading to higher testing austenitic one, according to Schaeffler diagram [14 ]. To obtain the same eroded mass by both methods, In P3 steel, small amounts of Ti (0.92 wt%), were added testing time for the stationary sample method must be [15]. Its chemical composition is close to that of maraging approximately five times higher than the first. The cavitation erosion testing setup consists of the present because compounds which it favors generate the precipitation of the highest hardening eNffie3Tcti following systems: Hielscher UP200St electronic ultrasonic generator; oscillation system; vessel for the [16, 17]. Cavitant fluid provided with copper spiral cooling system continuously cooled with water
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
