Enhanced cooling rates in laser directed energy deposition with interlayer peening
Purpose: This study aims to investigate the effect of mechanical peening on the cooling rate of a subsequently deposited layer in a hybrid additive manufacturing (AM) process. Design/methodology/approach: In this experimental study, 20 layers of 316 L stainless steel are built via directed energy de...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/165859 |
| _version_ | 1811679645099098112 |
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| author | Mithal, Abeer Maharjan, Niroj Idapalapati, Sridhar |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Mithal, Abeer Maharjan, Niroj Idapalapati, Sridhar |
| author_sort | Mithal, Abeer |
| collection | NTU |
| description | Purpose: This study aims to investigate the effect of mechanical peening on the cooling rate of a subsequently deposited layer in a hybrid additive manufacturing (AM) process. Design/methodology/approach: In this experimental study, 20 layers of 316 L stainless steel are built via directed energy deposition, with the tenth layer being subject to various peening processes (shot peening, hammer peening and laser shock peening). The microstructure of the eleventh layer of all the samples is then characterized to estimate the cooling rate. Findings: The measurements indicate that the application of interlayer peening causes a reduction in primary cellular arm spacing and an increase in micro segregation as compared to a sample prepared without interlayer peening. Both factors indicate an increase in the cooling rate brought about by the interlayer peening. Practical implications: This work provides insight into process design for hybrid AM processes as cooling rates are known to influence mechanical properties in laser-based AM. Originality/value: To the best of the authors’ knowledge, this work is the first of its kind to evaluate the effects of interlayer peening on a subsequently deposited layer in a hybrid AM process. |
| first_indexed | 2024-10-01T03:12:27Z |
| format | Journal Article |
| id | ntu-10356/165859 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:12:27Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1658592023-04-15T16:49:28Z Enhanced cooling rates in laser directed energy deposition with interlayer peening Mithal, Abeer Maharjan, Niroj Idapalapati, Sridhar School of Mechanical and Aerospace Engineering Advanced Remanufacturing and Technology Centre, A*STAR Engineering::Mechanical engineering Hybrid Additive Manufacturing Directed Energy Deposition Purpose: This study aims to investigate the effect of mechanical peening on the cooling rate of a subsequently deposited layer in a hybrid additive manufacturing (AM) process. Design/methodology/approach: In this experimental study, 20 layers of 316 L stainless steel are built via directed energy deposition, with the tenth layer being subject to various peening processes (shot peening, hammer peening and laser shock peening). The microstructure of the eleventh layer of all the samples is then characterized to estimate the cooling rate. Findings: The measurements indicate that the application of interlayer peening causes a reduction in primary cellular arm spacing and an increase in micro segregation as compared to a sample prepared without interlayer peening. Both factors indicate an increase in the cooling rate brought about by the interlayer peening. Practical implications: This work provides insight into process design for hybrid AM processes as cooling rates are known to influence mechanical properties in laser-based AM. Originality/value: To the best of the authors’ knowledge, this work is the first of its kind to evaluate the effects of interlayer peening on a subsequently deposited layer in a hybrid AM process. Agency for Science, Technology and Research (A*STAR) Nanyang Technological University Submitted/Accepted version The funding support from Advanced Remanufacturing Technology Centre (ARTC), Singapore and Nanyang Technological University is gratefully acknowledged. Abeer acknowledges the financial support from A*STAR Graduate Academy (AGA), Singapore in the form of a PhD scholarship. 2023-04-12T07:49:18Z 2023-04-12T07:49:18Z 2023 Journal Article Mithal, A., Maharjan, N. & Idapalapati, S. (2023). Enhanced cooling rates in laser directed energy deposition with interlayer peening. Rapid Prototyping Journal. https://dx.doi.org/10.1108/RPJ-11-2022-0395 1355-2546 https://hdl.handle.net/10356/165859 10.1108/RPJ-11-2022-0395 2-s2.0-85148961077 en Rapid Prototyping Journal © Emerald Publishing Limited. All rights reserved. This paper was published in Rapid Prototyping Journal and is made available with permission of Emerald Publishing Limited. application/pdf |
| spellingShingle | Engineering::Mechanical engineering Hybrid Additive Manufacturing Directed Energy Deposition Mithal, Abeer Maharjan, Niroj Idapalapati, Sridhar Enhanced cooling rates in laser directed energy deposition with interlayer peening |
| title | Enhanced cooling rates in laser directed energy deposition with interlayer peening |
| title_full | Enhanced cooling rates in laser directed energy deposition with interlayer peening |
| title_fullStr | Enhanced cooling rates in laser directed energy deposition with interlayer peening |
| title_full_unstemmed | Enhanced cooling rates in laser directed energy deposition with interlayer peening |
| title_short | Enhanced cooling rates in laser directed energy deposition with interlayer peening |
| title_sort | enhanced cooling rates in laser directed energy deposition with interlayer peening |
| topic | Engineering::Mechanical engineering Hybrid Additive Manufacturing Directed Energy Deposition |
| url | https://hdl.handle.net/10356/165859 |
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