期刊名称：Scientific Journals of the Maritime University of Szczecin
印刷版ISSN：1733-8670
电子版ISSN：2392-0378
出版年度：2018
卷号：56
页码：30-35
DOI：10.17402/310
语种：English
出版社：MUS
摘要：Cavitation is a one of many wear mechanisms which are related to the flow of liquid.It is one of the most destructive wear methods for stainless materials.The local changes in the pressure of the liquid stream related to the flow across the metal component cause straightening of the surface area,as well as its erosion and the formation of pits on the surface layer.The erosion value of cavitation is related to the material’s microstructure,the geometry of the element,the phase composition of the material and the surface roughness.In this paper the investigation of the cavitation process for duplex stainless steel has been performed.Samples examined in the first stages of the experiments were not significantly changed,but after a long time the hardness increase was very visible.The result of the cavitation was also cracking along the interphase boundaries,which resulted in the chipping of the material.One of the most important results was a description of the change in the wear mechanisms and its intensity during the cavitation exposure time.At first plastic micro deformation of the material’s surface occurred,then the plastic deformation increased significantly and after some time this resulted in erosion of the material and interfacial boundary decohesion;these two effects increased simultaneously.The last of the mechanisms was mechanical destabilization of the austenite,but the clear result of the mechanical destabilization of the austenite was only observed in the last sample.Martensitic transformation of the material changed the material’s mechanical properties,but for the stainless steels this resulted in electrochemical corrosion of the material,especially through the formation of an electrochemical potential between austenite and martensite.
其他摘要：В ландшафтном картографировании отсутствует единая методика,поэто– му в каждой ландшафтной школе существует своя техника составления ландшафтных карт.Тем не менее,одной из начальных операций,признанных во всех школах является вы– деление так называемой первичной матрицы–или матрицы местоположений,фиксируе– мой,как правило,по исходной топографической карте.Процедура отрисовки первичной матрицы почти аналогична в разных школах.Центральным понятием московской,ленин– градской и воронежской школ ландшафтоведения стало «местообитание»,«местополо– жение»,привязанное к форме рельефа неопределенной мерности.Мы стремимся придать этой мерности определенный геолого–геоморфологический смысл..
