Microstructure and Cavitation Damage Characteristics of GX40CrNiSi25-20 Cast Stainless Steel by TIG Surface Remelting
Cavitation erosion degrades the surface of engineering components when the material is exposed to turbulent fluid flows. Under conditions of local pressure fluctuations, a nucleation of gas or vapor bubbles occurs. If the pressure suddenly drops below the vapor pressure, these bubbles collapse viole...
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MDPI AG
2023-02-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/4/1423 |
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| author | Ion Mitelea Ilare Bordeaşu Daniela Cosma (Alexa) Ion-Dragoș Uțu Corneliu Marius Crăciunescu |
| author_facet | Ion Mitelea Ilare Bordeaşu Daniela Cosma (Alexa) Ion-Dragoș Uțu Corneliu Marius Crăciunescu |
| author_sort | Ion Mitelea |
| collection | DOAJ |
| description | Cavitation erosion degrades the surface of engineering components when the material is exposed to turbulent fluid flows. Under conditions of local pressure fluctuations, a nucleation of gas or vapor bubbles occurs. If the pressure suddenly drops below the vapor pressure, these bubbles collapse violently when subjected to higher pressure. This collapse is accompanied by the sudden flow of the liquid, which is manifested by stress pulses capable of causing plastic deformations on solid surfaces. Repeating these stress conditions can cause material removal and ultimately failure of the component itself. The present study aims to reduce the negative impact of this phenomenon on the mechanical systems components, using the TIG local surface remelting technique. Cavitation erosion tests were performed in accordance with the ASTM G32-2016 standard on samples taken from a cast high-alloy stainless steel. The alloy response for each melting current value was investigated by measuring mass loss as a function of cavitation attack time and by analyzing the damaged surfaces using optical and scanning electron microscopes. It was highlighted that the TIG remelted layers provide an increase in cavitation erosion resistance of 5–6 times as a consequence of the fine graining and microstructure induced by the technique applied. |
| first_indexed | 2024-03-11T08:30:37Z |
| format | Article |
| id | doaj.art-9f894072b9a54f23a508d60ecc710784 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T08:30:37Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-9f894072b9a54f23a508d60ecc7107842023-11-16T21:49:36ZengMDPI AGMaterials1996-19442023-02-01164142310.3390/ma16041423Microstructure and Cavitation Damage Characteristics of GX40CrNiSi25-20 Cast Stainless Steel by TIG Surface RemeltingIon Mitelea0Ilare Bordeaşu1Daniela Cosma (Alexa)2Ion-Dragoș Uțu3Corneliu Marius Crăciunescu4Department of Materials and Fabrication Engineering, Politehnica University Timisoara, Bulevardul Mihai Viteazul nr.1, 300222 Timisoara, RomaniaDepartment of Mechanical Machines, Equipment and Transports, Politehnica University Timisoara, Bulevardul Mihai Viteazul nr.1, 300222 Timisoara, RomaniaDepartment of Materials and Fabrication Engineering, Politehnica University Timisoara, Bulevardul Mihai Viteazul nr.1, 300222 Timisoara, RomaniaDepartment of Materials and Fabrication Engineering, Politehnica University Timisoara, Bulevardul Mihai Viteazul nr.1, 300222 Timisoara, RomaniaDepartment of Materials and Fabrication Engineering, Politehnica University Timisoara, Bulevardul Mihai Viteazul nr.1, 300222 Timisoara, RomaniaCavitation erosion degrades the surface of engineering components when the material is exposed to turbulent fluid flows. Under conditions of local pressure fluctuations, a nucleation of gas or vapor bubbles occurs. If the pressure suddenly drops below the vapor pressure, these bubbles collapse violently when subjected to higher pressure. This collapse is accompanied by the sudden flow of the liquid, which is manifested by stress pulses capable of causing plastic deformations on solid surfaces. Repeating these stress conditions can cause material removal and ultimately failure of the component itself. The present study aims to reduce the negative impact of this phenomenon on the mechanical systems components, using the TIG local surface remelting technique. Cavitation erosion tests were performed in accordance with the ASTM G32-2016 standard on samples taken from a cast high-alloy stainless steel. The alloy response for each melting current value was investigated by measuring mass loss as a function of cavitation attack time and by analyzing the damaged surfaces using optical and scanning electron microscopes. It was highlighted that the TIG remelted layers provide an increase in cavitation erosion resistance of 5–6 times as a consequence of the fine graining and microstructure induced by the technique applied.https://www.mdpi.com/1996-1944/16/4/1423high Cr-Ni-Si cast stainless steelcavitation erosionmicrostructureTIG surface remelting |
| spellingShingle | Ion Mitelea Ilare Bordeaşu Daniela Cosma (Alexa) Ion-Dragoș Uțu Corneliu Marius Crăciunescu Microstructure and Cavitation Damage Characteristics of GX40CrNiSi25-20 Cast Stainless Steel by TIG Surface Remelting Materials high Cr-Ni-Si cast stainless steel cavitation erosion microstructure TIG surface remelting |
| title | Microstructure and Cavitation Damage Characteristics of GX40CrNiSi25-20 Cast Stainless Steel by TIG Surface Remelting |
| title_full | Microstructure and Cavitation Damage Characteristics of GX40CrNiSi25-20 Cast Stainless Steel by TIG Surface Remelting |
| title_fullStr | Microstructure and Cavitation Damage Characteristics of GX40CrNiSi25-20 Cast Stainless Steel by TIG Surface Remelting |
| title_full_unstemmed | Microstructure and Cavitation Damage Characteristics of GX40CrNiSi25-20 Cast Stainless Steel by TIG Surface Remelting |
| title_short | Microstructure and Cavitation Damage Characteristics of GX40CrNiSi25-20 Cast Stainless Steel by TIG Surface Remelting |
| title_sort | microstructure and cavitation damage characteristics of gx40crnisi25 20 cast stainless steel by tig surface remelting |
| topic | high Cr-Ni-Si cast stainless steel cavitation erosion microstructure TIG surface remelting |
| url | https://www.mdpi.com/1996-1944/16/4/1423 |
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