Numerical Investigation of Degradation of 316L Steel Caused by Cavitation

The degradation process of 316L stainless steel caused by cavitation was investigated by means of finite element analysis. The damage characteristics of metal specimens subjected to the cavitation bubble collapse process were recreated by simulation with a micro-jet water hammer. The simulation resu...

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Main Author: Artur Maurin
Format: Article
Language:English
Published: MDPI AG 2021-06-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/14/11/3131
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spelling doaj-397ccb56e04e48779b92e52593baeaa62021-06-30T23:32:24ZengMDPI AGMaterials1996-19442021-06-01143131313110.3390/ma14113131Numerical Investigation of Degradation of 316L Steel Caused by CavitationArtur Maurin0Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Hydropower Department, Fiszera 14 St., 80-231 Gdańsk, PolandThe degradation process of 316L stainless steel caused by cavitation was investigated by means of finite element analysis. The damage characteristics of metal specimens subjected to the cavitation bubble collapse process were recreated by simulation with a micro-jet water hammer. The simulation results were compared with the cavitation pits created in the experimental tests. In the experiment, different inlet and outlet pressures in a test chamber with a system of barricade exciters differentiated the erosion process results. Hydrodynamic cavitation caused uneven distribution of the erosion over the specimens’ surface, which has been validated by roughness measurements, enabling localisation and identification of the shape and topography of the impact pits. The erosion rate of the steel specimens was high at the beginning of the test and decreased over time, indicating the phase transformation and/or the strain-hardening of the surface layer. A numerical simulation showed that the impact of the water micro-jet with a velocity of 100 m/s exceeds the tensile strength of 316L steel, and produces an impact pit. The subsequent micro-jet impact on the same zone deepens the pit depth only to a certain extent due to elastoplastic surface hardening. The correlation between post-impact pit geometry and impact velocity was investigated.https://www.mdpi.com/1996-1944/14/11/3131cavitation erosionmicro-jetnumerical simulation316L steel
collection DOAJ
language English
format Article
sources DOAJ
author Artur Maurin
spellingShingle Artur Maurin
Numerical Investigation of Degradation of 316L Steel Caused by Cavitation
Materials
cavitation erosion
micro-jet
numerical simulation
316L steel
author_facet Artur Maurin
author_sort Artur Maurin
title Numerical Investigation of Degradation of 316L Steel Caused by Cavitation
title_short Numerical Investigation of Degradation of 316L Steel Caused by Cavitation
title_full Numerical Investigation of Degradation of 316L Steel Caused by Cavitation
title_fullStr Numerical Investigation of Degradation of 316L Steel Caused by Cavitation
title_full_unstemmed Numerical Investigation of Degradation of 316L Steel Caused by Cavitation
title_sort numerical investigation of degradation of 316l steel caused by cavitation
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2021-06-01
description The degradation process of 316L stainless steel caused by cavitation was investigated by means of finite element analysis. The damage characteristics of metal specimens subjected to the cavitation bubble collapse process were recreated by simulation with a micro-jet water hammer. The simulation results were compared with the cavitation pits created in the experimental tests. In the experiment, different inlet and outlet pressures in a test chamber with a system of barricade exciters differentiated the erosion process results. Hydrodynamic cavitation caused uneven distribution of the erosion over the specimens’ surface, which has been validated by roughness measurements, enabling localisation and identification of the shape and topography of the impact pits. The erosion rate of the steel specimens was high at the beginning of the test and decreased over time, indicating the phase transformation and/or the strain-hardening of the surface layer. A numerical simulation showed that the impact of the water micro-jet with a velocity of 100 m/s exceeds the tensile strength of 316L steel, and produces an impact pit. The subsequent micro-jet impact on the same zone deepens the pit depth only to a certain extent due to elastoplastic surface hardening. The correlation between post-impact pit geometry and impact velocity was investigated.
topic cavitation erosion
micro-jet
numerical simulation
316L steel
url https://www.mdpi.com/1996-1944/14/11/3131
work_keys_str_mv AT arturmaurin numericalinvestigationofdegradationof316lsteelcausedbycavitation
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