The role of microstructure stability in the failure of exhaust valves in heavy-duty diesel engines
Failure of valves in heavy-duty diesel engines is a significant challenge for engine reliability. This study aims to investigate the metallurgical factors that led to the failure of several exhaust valves made from a nitrogen-containing Fe–Mn–Cr–Mo–Nb–V alloy. The failures predominantly occurred in...
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| Language: | English |
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424028138 |
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| author | Majid Pouranvari Navid Azghani Ali Ghasemi Swee Leong Sing |
| author_facet | Majid Pouranvari Navid Azghani Ali Ghasemi Swee Leong Sing |
| author_sort | Majid Pouranvari |
| collection | DOAJ |
| description | Failure of valves in heavy-duty diesel engines is a significant challenge for engine reliability. This study aims to investigate the metallurgical factors that led to the failure of several exhaust valves made from a nitrogen-containing Fe–Mn–Cr–Mo–Nb–V alloy. The failures predominantly occurred in the hot section of the valve stem and were attributed to environmentally assisted fatigue. The primary cause of failure was identified as the low thermal stability of the valve microstructure, characterized by a high-volume fraction of discontinuous cellular precipitation of M23C6/austenite in the hot section of the valve stem. This microstructural instability played a crucial role in initiating and propagating corrosion/oxidation-assisted fatigue cracks due to the precipitation of low toughness Cr-rich carbides and formation of associated Cr-depleted zone the subsequent creation of Cr-depleted areas. To mitigate similar failures in heavy-duty diesel engines operating under increased peak cylinder pressures and temperatures, it is imperative to utilize materials with higher thermal stability and improved corrosion/oxidation resistance. |
| format | Article |
| id | doaj-art-b07a9b09066e4b0d9f472b85caff5939 |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-b07a9b09066e4b0d9f472b85caff59392025-08-20T01:57:25ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01339843985210.1016/j.jmrt.2024.12.010The role of microstructure stability in the failure of exhaust valves in heavy-duty diesel enginesMajid Pouranvari0Navid Azghani1Ali Ghasemi2Swee Leong Sing3Department of Materials Science and Engineering, Sharif University of Technology, 11365-9466, Tehran, Iran; Corresponding author.Department of Materials Science and Engineering, Sharif University of Technology, 11365-9466, Tehran, IranDepartment of Mechanical Engineering, College of Design and Engineering, National University of Singapore, SingaporeDepartment of Mechanical Engineering, College of Design and Engineering, National University of Singapore, SingaporeFailure of valves in heavy-duty diesel engines is a significant challenge for engine reliability. This study aims to investigate the metallurgical factors that led to the failure of several exhaust valves made from a nitrogen-containing Fe–Mn–Cr–Mo–Nb–V alloy. The failures predominantly occurred in the hot section of the valve stem and were attributed to environmentally assisted fatigue. The primary cause of failure was identified as the low thermal stability of the valve microstructure, characterized by a high-volume fraction of discontinuous cellular precipitation of M23C6/austenite in the hot section of the valve stem. This microstructural instability played a crucial role in initiating and propagating corrosion/oxidation-assisted fatigue cracks due to the precipitation of low toughness Cr-rich carbides and formation of associated Cr-depleted zone the subsequent creation of Cr-depleted areas. To mitigate similar failures in heavy-duty diesel engines operating under increased peak cylinder pressures and temperatures, it is imperative to utilize materials with higher thermal stability and improved corrosion/oxidation resistance.http://www.sciencedirect.com/science/article/pii/S2238785424028138Valve alloyHeavy-duty diesel engineThermal stabilityDiscontinuous cellular precipitationEnvironmentally assisted fatigue |
| spellingShingle | Majid Pouranvari Navid Azghani Ali Ghasemi Swee Leong Sing The role of microstructure stability in the failure of exhaust valves in heavy-duty diesel engines Journal of Materials Research and Technology Valve alloy Heavy-duty diesel engine Thermal stability Discontinuous cellular precipitation Environmentally assisted fatigue |
| title | The role of microstructure stability in the failure of exhaust valves in heavy-duty diesel engines |
| title_full | The role of microstructure stability in the failure of exhaust valves in heavy-duty diesel engines |
| title_fullStr | The role of microstructure stability in the failure of exhaust valves in heavy-duty diesel engines |
| title_full_unstemmed | The role of microstructure stability in the failure of exhaust valves in heavy-duty diesel engines |
| title_short | The role of microstructure stability in the failure of exhaust valves in heavy-duty diesel engines |
| title_sort | role of microstructure stability in the failure of exhaust valves in heavy duty diesel engines |
| topic | Valve alloy Heavy-duty diesel engine Thermal stability Discontinuous cellular precipitation Environmentally assisted fatigue |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424028138 |
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