Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy
The influence of residual compressive stress (RCS) depth and magnitude generated through surface treatments such as shot peening (SP), deep cold rolling (DCR), and vibro-peening (VP) on fatigue crack mechanisms of Ni-based superalloy is investigated. The fatigue performance with associated failure m...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/159574 |
| _version_ | 1826120515696197632 |
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| author | Kumar, Dharmesh Idapalapati, Sridhar Wang, Wei |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Kumar, Dharmesh Idapalapati, Sridhar Wang, Wei |
| author_sort | Kumar, Dharmesh |
| collection | NTU |
| description | The influence of residual compressive stress (RCS) depth and magnitude generated through surface treatments such as shot peening (SP), deep cold rolling (DCR), and vibro-peening (VP) on fatigue crack mechanisms of Ni-based superalloy is investigated. The fatigue performance with associated failure mechanisms is measured under strain-controlled fatigue testing upto 104 cycles with total strain in the range of 0.9%–1.4% at an R ratio of 0.1 and 400°C followed by load controlled fatigue until failure. In-depth understanding of the failure mechanism is obtained through fractography analysis, cyclic stress–strain plot, and microstructural features. A pronounced improvement in fatigue life tested at low strain range (0.9%–1.1%) is achieved after inducing RCS up to 400 μm depth. However, the fatigue life is reduced when RCS increased to 800–1000 μm depth. Failure is primarily driven by micro-cracks formed due to balancing tensile stresses and high intensity stress concentration generated as the result of dislocation pile-ups and slip bands. Results are discussed in detail through the evidence of grain refinement, addition of low angle grain boundaries (LAGBs), strain accumulation, and intragranular deformation in the sub-surface. |
| first_indexed | 2024-10-01T05:18:03Z |
| format | Journal Article |
| id | ntu-10356/159574 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:18:03Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1595742022-06-28T01:02:30Z Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy Kumar, Dharmesh Idapalapati, Sridhar Wang, Wei School of Mechanical and Aerospace Engineering Advanced Remanufacturing andTechnology Centre, A*STAR Singapore Institute of ManufacturingTechnology, A*STAR Engineering::Mechanical engineering Deep Cold Rolling Electron-Back Scattered Diffraction The influence of residual compressive stress (RCS) depth and magnitude generated through surface treatments such as shot peening (SP), deep cold rolling (DCR), and vibro-peening (VP) on fatigue crack mechanisms of Ni-based superalloy is investigated. The fatigue performance with associated failure mechanisms is measured under strain-controlled fatigue testing upto 104 cycles with total strain in the range of 0.9%–1.4% at an R ratio of 0.1 and 400°C followed by load controlled fatigue until failure. In-depth understanding of the failure mechanism is obtained through fractography analysis, cyclic stress–strain plot, and microstructural features. A pronounced improvement in fatigue life tested at low strain range (0.9%–1.1%) is achieved after inducing RCS up to 400 μm depth. However, the fatigue life is reduced when RCS increased to 800–1000 μm depth. Failure is primarily driven by micro-cracks formed due to balancing tensile stresses and high intensity stress concentration generated as the result of dislocation pile-ups and slip bands. Results are discussed in detail through the evidence of grain refinement, addition of low angle grain boundaries (LAGBs), strain accumulation, and intragranular deformation in the sub-surface. Nanyang Technological University Authors thank Nanyang Technological University (NTU), Singapore, and Advanced Remanufacturing and KUMARET AL.1599 Technology Centre (ARTC), Singapore, for providing research funding support to this project, and Rolls-Royce Singapore for materials support. D. Kumar thanks NTU for the financial support in the form of NTU Research Scholarship. 2022-06-28T01:02:30Z 2022-06-28T01:02:30Z 2021 Journal Article Kumar, D., Idapalapati, S. & Wang, W. (2021). Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy. Fatigue and Fracture of Engineering Materials and Structures, 44(6), 1583-1601. https://dx.doi.org/10.1111/ffe.13454 8756-758X https://hdl.handle.net/10356/159574 10.1111/ffe.13454 2-s2.0-85103163507 6 44 1583 1601 en Fatigue and Fracture of Engineering Materials and Structures © 2021 John Wiley & Sons, Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Deep Cold Rolling Electron-Back Scattered Diffraction Kumar, Dharmesh Idapalapati, Sridhar Wang, Wei Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy |
| title | Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy |
| title_full | Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy |
| title_fullStr | Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy |
| title_full_unstemmed | Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy |
| title_short | Influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in Ni-based Superalloy |
| title_sort | influence of residual stress distribution and microstructural characteristics on fatigue failure mechanism in ni based superalloy |
| topic | Engineering::Mechanical engineering Deep Cold Rolling Electron-Back Scattered Diffraction |
| url | https://hdl.handle.net/10356/159574 |
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