Characterization of laser cladding materials for rail steel repair
Rail defects have the potential to disrupt the rail industry and possibly lead to disastrous events if the defective rails are not identified and replaced. Laser cladding repair of rail steel has shown promise as a viable solution. The aim of this research is to determine how laser cladding would af...
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| Format: | Final Year Project (FYP) |
| Language: | English |
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Nanyang Technological University
2020
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| Online Access: | https://hdl.handle.net/10356/140219 |
| _version_ | 1826116674593488896 |
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| author | Teo, Kennedy Jie Yi |
| author2 | Pang Hock Lye, John |
| author_facet | Pang Hock Lye, John Teo, Kennedy Jie Yi |
| author_sort | Teo, Kennedy Jie Yi |
| collection | NTU |
| description | Rail defects have the potential to disrupt the rail industry and possibly lead to disastrous events if the defective rails are not identified and replaced. Laser cladding repair of rail steel has shown promise as a viable solution. The aim of this research is to determine how laser cladding would affect the metallurgical properties of rail steel and to characterise the laser cladding material used. For this study, the cladding material selected is Stellite 6 due to its high hardness and strength. As defects were more likely to occur on curved tracks, the base material chosen is R350HT grade rail steel. Microscopic, microstructural and microhardness analysis were carried out to assess if the cladding material conforms with the rail substrate. Dendrite, martensite and pearlite phases were observed in the cladded, heat affected zone (HAZ) and the substrate regions, respectively. In addition, shear testing and analysis was conducted to check for possible delamination and to investigate the clad-rail substrate interface bond strength. All 4 specimens had obtained a higher shear strength as compared to the substrate material. Future research of the cladding material Inconel 718 on rail steel and the preventive aspect of maintenance instead of repairing aspect were proposed. |
| first_indexed | 2024-10-01T04:15:34Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/140219 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:15:34Z |
| publishDate | 2020 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1402192023-03-04T20:00:03Z Characterization of laser cladding materials for rail steel repair Teo, Kennedy Jie Yi Pang Hock Lye, John School of Mechanical and Aerospace Engineering mhlpang@ntu.edu.sg Engineering::Mechanical engineering Rail defects have the potential to disrupt the rail industry and possibly lead to disastrous events if the defective rails are not identified and replaced. Laser cladding repair of rail steel has shown promise as a viable solution. The aim of this research is to determine how laser cladding would affect the metallurgical properties of rail steel and to characterise the laser cladding material used. For this study, the cladding material selected is Stellite 6 due to its high hardness and strength. As defects were more likely to occur on curved tracks, the base material chosen is R350HT grade rail steel. Microscopic, microstructural and microhardness analysis were carried out to assess if the cladding material conforms with the rail substrate. Dendrite, martensite and pearlite phases were observed in the cladded, heat affected zone (HAZ) and the substrate regions, respectively. In addition, shear testing and analysis was conducted to check for possible delamination and to investigate the clad-rail substrate interface bond strength. All 4 specimens had obtained a higher shear strength as compared to the substrate material. Future research of the cladding material Inconel 718 on rail steel and the preventive aspect of maintenance instead of repairing aspect were proposed. Bachelor of Engineering (Mechanical Engineering) 2020-05-27T07:08:47Z 2020-05-27T07:08:47Z 2020 Final Year Project (FYP) https://hdl.handle.net/10356/140219 en B377 application/pdf Nanyang Technological University |
| spellingShingle | Engineering::Mechanical engineering Teo, Kennedy Jie Yi Characterization of laser cladding materials for rail steel repair |
| title | Characterization of laser cladding materials for rail steel repair |
| title_full | Characterization of laser cladding materials for rail steel repair |
| title_fullStr | Characterization of laser cladding materials for rail steel repair |
| title_full_unstemmed | Characterization of laser cladding materials for rail steel repair |
| title_short | Characterization of laser cladding materials for rail steel repair |
| title_sort | characterization of laser cladding materials for rail steel repair |
| topic | Engineering::Mechanical engineering |
| url | https://hdl.handle.net/10356/140219 |
| work_keys_str_mv | AT teokennedyjieyi characterizationoflasercladdingmaterialsforrailsteelrepair |