Microstructure and cavitation-silt erosion behavior of two HVOF-sprayed hardfacing coatings for hydro-turbine applications
The cavitation-silt erosion (CSE) has caused severe technical challenges and economic losses to the hydro-turbine operated in silt-laden river. In this manuscript, two hardfacing (i.e., WC-20(Cr3C2)-7Ni and Cr3C2-25(NiCr)) coatings were manufactured via a high-velocity oxygen fuel (HVOF) spraying me...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | Alexandria Engineering Journal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110016823001084 |
| _version_ | 1797847738163920896 |
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| author | Sheng Hong Xinlu Shi Jinran Lin Yuping Wu Jiahui Li Yuan Zheng |
| author_facet | Sheng Hong Xinlu Shi Jinran Lin Yuping Wu Jiahui Li Yuan Zheng |
| author_sort | Sheng Hong |
| collection | DOAJ |
| description | The cavitation-silt erosion (CSE) has caused severe technical challenges and economic losses to the hydro-turbine operated in silt-laden river. In this manuscript, two hardfacing (i.e., WC-20(Cr3C2)-7Ni and Cr3C2-25(NiCr)) coatings were manufactured via a high-velocity oxygen fuel (HVOF) spraying method, and effects of flow velocities (FVs) and sand concentrations (SCs) on their CSE behaviors with the help of a rotating disk rig facility were investigated. Results indicated that the WC-20(Cr3C2)-7Ni coating exhibited lower porosity, higher KIC, H/E and H3/E2 as well as superior CSE resistance, and its CSE resistance was less affected by FV as well as SC compared with the Cr3C2-25(NiCr) coating. Both FV and SC had a positive effect on the CSE degradation of the two hardfacing coatings, while SC had a greater effect on their CSE resistances than FV. With increasing FV and SC, the WC-20(Cr3C2)-7Ni coating experienced the CSE damage of the few micro-cracks, scattered cavitation pinholes, fracturing of carbide particles, pronounced scour marks, isolation and peeling off of carbide particles, and crater formation, while the CSE process of the Cr3C2-25(NiCr) coating primarily included the micro-cracks and scattered cavitation pinholes, peeling off of chromium carbide particles, long and deep scour marks, and coating spalling and crater formation. |
| first_indexed | 2024-04-09T18:17:06Z |
| format | Article |
| id | doaj.art-ff6e5aa13ba441a4bfa080e23c3764ff |
| institution | Directory Open Access Journal |
| issn | 1110-0168 |
| language | English |
| last_indexed | 2024-04-09T18:17:06Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Alexandria Engineering Journal |
| spelling | doaj.art-ff6e5aa13ba441a4bfa080e23c3764ff2023-04-13T04:26:19ZengElsevierAlexandria Engineering Journal1110-01682023-04-0169483496Microstructure and cavitation-silt erosion behavior of two HVOF-sprayed hardfacing coatings for hydro-turbine applicationsSheng Hong0Xinlu Shi1Jinran Lin2Yuping Wu3Jiahui Li4Yuan Zheng5College of Mechanics and Materials, Hohai University, 8 Focheng West Road, Nanjing 211100, PR China; Corresponding author.College of Mechanics and Materials, Hohai University, 8 Focheng West Road, Nanjing 211100, PR ChinaCollege of Engineering, Nanjing Agricultural University, 40 Dianjiangtai Road, Nanjing 210031, PR ChinaCollege of Mechanics and Materials, Hohai University, 8 Focheng West Road, Nanjing 211100, PR ChinaCollege of Mechanics and Materials, Hohai University, 8 Focheng West Road, Nanjing 211100, PR ChinaCollege of Energy and Electrical Engineering, Hohai University, 8 Focheng West Road, Nanjing 211100, PR ChinaThe cavitation-silt erosion (CSE) has caused severe technical challenges and economic losses to the hydro-turbine operated in silt-laden river. In this manuscript, two hardfacing (i.e., WC-20(Cr3C2)-7Ni and Cr3C2-25(NiCr)) coatings were manufactured via a high-velocity oxygen fuel (HVOF) spraying method, and effects of flow velocities (FVs) and sand concentrations (SCs) on their CSE behaviors with the help of a rotating disk rig facility were investigated. Results indicated that the WC-20(Cr3C2)-7Ni coating exhibited lower porosity, higher KIC, H/E and H3/E2 as well as superior CSE resistance, and its CSE resistance was less affected by FV as well as SC compared with the Cr3C2-25(NiCr) coating. Both FV and SC had a positive effect on the CSE degradation of the two hardfacing coatings, while SC had a greater effect on their CSE resistances than FV. With increasing FV and SC, the WC-20(Cr3C2)-7Ni coating experienced the CSE damage of the few micro-cracks, scattered cavitation pinholes, fracturing of carbide particles, pronounced scour marks, isolation and peeling off of carbide particles, and crater formation, while the CSE process of the Cr3C2-25(NiCr) coating primarily included the micro-cracks and scattered cavitation pinholes, peeling off of chromium carbide particles, long and deep scour marks, and coating spalling and crater formation.http://www.sciencedirect.com/science/article/pii/S1110016823001084HardfacingCoatingHVOFCavitation-silt erosion |
| spellingShingle | Sheng Hong Xinlu Shi Jinran Lin Yuping Wu Jiahui Li Yuan Zheng Microstructure and cavitation-silt erosion behavior of two HVOF-sprayed hardfacing coatings for hydro-turbine applications Alexandria Engineering Journal Hardfacing Coating HVOF Cavitation-silt erosion |
| title | Microstructure and cavitation-silt erosion behavior of two HVOF-sprayed hardfacing coatings for hydro-turbine applications |
| title_full | Microstructure and cavitation-silt erosion behavior of two HVOF-sprayed hardfacing coatings for hydro-turbine applications |
| title_fullStr | Microstructure and cavitation-silt erosion behavior of two HVOF-sprayed hardfacing coatings for hydro-turbine applications |
| title_full_unstemmed | Microstructure and cavitation-silt erosion behavior of two HVOF-sprayed hardfacing coatings for hydro-turbine applications |
| title_short | Microstructure and cavitation-silt erosion behavior of two HVOF-sprayed hardfacing coatings for hydro-turbine applications |
| title_sort | microstructure and cavitation silt erosion behavior of two hvof sprayed hardfacing coatings for hydro turbine applications |
| topic | Hardfacing Coating HVOF Cavitation-silt erosion |
| url | http://www.sciencedirect.com/science/article/pii/S1110016823001084 |
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