Microstructural response and strain hardening in deep cold rolled nickel-based superalloy for aerospace application
Fatigue crack resistance is a critical factor for the performance of aero-engine components. Deep cold rolling (DCR) is one promising surface enhancement technique, as it generates deep compressive residual stresses with the good surface finish. In this work, the influence of DCR process on the micr...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/88867 http://hdl.handle.net/10220/45988 |
| _version_ | 1826115955743260672 |
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| author | Kumar, Dharmesh Idapalapati, Sridhar Wei, Wang |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Kumar, Dharmesh Idapalapati, Sridhar Wei, Wang |
| author_sort | Kumar, Dharmesh |
| collection | NTU |
| description | Fatigue crack resistance is a critical factor for the performance of aero-engine components. Deep cold rolling (DCR) is one promising surface enhancement technique, as it generates deep compressive residual stresses with the good surface finish. In this work, the influence of DCR process on the microstructure and mechanical properties of nickel-based superalloy (Udimet 720Li) was investigated. After DCR process, a deep layer of compressive residual stress up to 1mm was observed, which agrees well with the depth profile of Vickers micro-hardness. Statistical analysis of Grain Orientation Spread (GOS) in the Electron Back Scattered Diffraction (EBSD) map also shows the presence of strain hardening layer after the DCR process. Results are discussed with a focus on the strengthening mechanism through grain refinement, the addition of Low Angle Grain Boundaries (LAGBs), and intragranular deformation in the sub-surface. Overall, this fundamental understanding could shed light on a new pathway to develop nickel-based superalloys with an excellent mechanical performance for aerospace applications. |
| first_indexed | 2024-10-01T04:03:33Z |
| format | Journal Article |
| id | ntu-10356/88867 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:03:33Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/888672023-03-04T17:13:25Z Microstructural response and strain hardening in deep cold rolled nickel-based superalloy for aerospace application Kumar, Dharmesh Idapalapati, Sridhar Wei, Wang School of Mechanical and Aerospace Engineering DRNTU::Engineering::Aeronautical engineering Deep Cold Rolling Nickel-based Superalloys Fatigue crack resistance is a critical factor for the performance of aero-engine components. Deep cold rolling (DCR) is one promising surface enhancement technique, as it generates deep compressive residual stresses with the good surface finish. In this work, the influence of DCR process on the microstructure and mechanical properties of nickel-based superalloy (Udimet 720Li) was investigated. After DCR process, a deep layer of compressive residual stress up to 1mm was observed, which agrees well with the depth profile of Vickers micro-hardness. Statistical analysis of Grain Orientation Spread (GOS) in the Electron Back Scattered Diffraction (EBSD) map also shows the presence of strain hardening layer after the DCR process. Results are discussed with a focus on the strengthening mechanism through grain refinement, the addition of Low Angle Grain Boundaries (LAGBs), and intragranular deformation in the sub-surface. Overall, this fundamental understanding could shed light on a new pathway to develop nickel-based superalloys with an excellent mechanical performance for aerospace applications. ASTAR (Agency for Sci., Tech. and Research, S’pore) Published version 2018-09-13T03:56:04Z 2019-12-06T17:12:43Z 2018-09-13T03:56:04Z 2019-12-06T17:12:43Z 2018 Journal Article Kumar, D., Idapalapati, S., & Wei, W. (2018). Microstructural Response and Strain Hardening in Deep Cold Rolled Nickel-based Superalloy for Aerospace Application. Procedia CIRP, 71, 374-379. doi:10.1016/j.procir.2018.05.044 2212-8271 https://hdl.handle.net/10356/88867 http://hdl.handle.net/10220/45988 10.1016/j.procir.2018.05.044 en Procedia CIRP © 2018 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). 6 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Aeronautical engineering Deep Cold Rolling Nickel-based Superalloys Kumar, Dharmesh Idapalapati, Sridhar Wei, Wang Microstructural response and strain hardening in deep cold rolled nickel-based superalloy for aerospace application |
| title | Microstructural response and strain hardening in deep cold rolled nickel-based superalloy for aerospace application |
| title_full | Microstructural response and strain hardening in deep cold rolled nickel-based superalloy for aerospace application |
| title_fullStr | Microstructural response and strain hardening in deep cold rolled nickel-based superalloy for aerospace application |
| title_full_unstemmed | Microstructural response and strain hardening in deep cold rolled nickel-based superalloy for aerospace application |
| title_short | Microstructural response and strain hardening in deep cold rolled nickel-based superalloy for aerospace application |
| title_sort | microstructural response and strain hardening in deep cold rolled nickel based superalloy for aerospace application |
| topic | DRNTU::Engineering::Aeronautical engineering Deep Cold Rolling Nickel-based Superalloys |
| url | https://hdl.handle.net/10356/88867 http://hdl.handle.net/10220/45988 |
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