The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head
Cylinder head is one of the most important parts of heated components in the engine, while cracking due to low strength and large residual stress at high temperature is the main failure mode of cylinder head. With the growing demand of good performance and high reliability, gray cast iron with trace...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-03-01
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| Series: | Journal of Materials Research and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785419314243 |
| _version_ | 1811337002005561344 |
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| author | Sining Pan Fanzheng Zeng Nanguang Su Zhaokun Xian |
| author_facet | Sining Pan Fanzheng Zeng Nanguang Su Zhaokun Xian |
| author_sort | Sining Pan |
| collection | DOAJ |
| description | Cylinder head is one of the most important parts of heated components in the engine, while cracking due to low strength and large residual stress at high temperature is the main failure mode of cylinder head. With the growing demand of good performance and high reliability, gray cast iron with trace alloying element and optimized annealing process are probably effective ways in obtaining suitable materials. The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head is studied in this paper. The results show that, the tensile strength, toughness, fatigue properties and thermal fatigue properties of gray cast iron are improved by adding trace niobium elements. The specimen with 0.20% niobium shows better comprehensive mechanical properties than others. The addition of trace niobium elements can not only refine the graphite, eutectic cell, carbide and phosphorus eutectic, but also reduce the pearlite lamellar space, thus strengthening the matrix. The cylinder head is made by cast iron with 0.20% niobium addition, and the annealing process of thermal aging is optimized. The residual stress of cylinder head can be maintained at a low level by adopting annealing process with higher holding temperature, longer holding time, lower cooling rate and lower outlet temperature. The analysis of microstructure, mechanical properties and residual stress for niobium alloyed cast iron is helpful for solving the cracking problem of cylinder head, and providing scientific basis for improving engine reliability. Keywords: Cast iron, Microstructure, Mechanical properties, Residual stress, Niobium alloyed |
| first_indexed | 2024-04-13T17:48:47Z |
| format | Article |
| id | doaj.art-507df6fef9ce4e2da4a45b34e8a8c928 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-13T17:48:47Z |
| publishDate | 2020-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-507df6fef9ce4e2da4a45b34e8a8c9282022-12-22T02:36:50ZengElsevierJournal of Materials Research and Technology2238-78542020-03-019215091518The effect of niobium addition on the microstructure and properties of cast iron used in cylinder headSining Pan0Fanzheng Zeng1Nanguang Su2Zhaokun Xian3College of Mechanical and Electrical Engineering, Hezhou University, China; Guang Xi Key Laboratory of Calclum Carbonate Resources Comprehensive Utilization, Hezhou University, China; Corresponding author.College of Mechanical and Electrical Engineering, Hezhou University, China; Guang Xi Key Laboratory of Calclum Carbonate Resources Comprehensive Utilization, Hezhou University, ChinaCollege of Mechanical and Electrical Engineering, Hezhou University, ChinaCollege of Mechanical and Electrical Engineering, Hezhou University, ChinaCylinder head is one of the most important parts of heated components in the engine, while cracking due to low strength and large residual stress at high temperature is the main failure mode of cylinder head. With the growing demand of good performance and high reliability, gray cast iron with trace alloying element and optimized annealing process are probably effective ways in obtaining suitable materials. The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head is studied in this paper. The results show that, the tensile strength, toughness, fatigue properties and thermal fatigue properties of gray cast iron are improved by adding trace niobium elements. The specimen with 0.20% niobium shows better comprehensive mechanical properties than others. The addition of trace niobium elements can not only refine the graphite, eutectic cell, carbide and phosphorus eutectic, but also reduce the pearlite lamellar space, thus strengthening the matrix. The cylinder head is made by cast iron with 0.20% niobium addition, and the annealing process of thermal aging is optimized. The residual stress of cylinder head can be maintained at a low level by adopting annealing process with higher holding temperature, longer holding time, lower cooling rate and lower outlet temperature. The analysis of microstructure, mechanical properties and residual stress for niobium alloyed cast iron is helpful for solving the cracking problem of cylinder head, and providing scientific basis for improving engine reliability. Keywords: Cast iron, Microstructure, Mechanical properties, Residual stress, Niobium alloyedhttp://www.sciencedirect.com/science/article/pii/S2238785419314243 |
| spellingShingle | Sining Pan Fanzheng Zeng Nanguang Su Zhaokun Xian The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head Journal of Materials Research and Technology |
| title | The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head |
| title_full | The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head |
| title_fullStr | The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head |
| title_full_unstemmed | The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head |
| title_short | The effect of niobium addition on the microstructure and properties of cast iron used in cylinder head |
| title_sort | effect of niobium addition on the microstructure and properties of cast iron used in cylinder head |
| url | http://www.sciencedirect.com/science/article/pii/S2238785419314243 |
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