Enhanced cooling rates in laser directed energy deposition with interlayer peening
ISSN: 1355-2546
Article publication date: 28 February 2023
Issue publication date: 2 June 2023
Abstract
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.
Keywords
Acknowledgements
Declaration of Competing Interests: The authors declare that they have no known personal or financial interests that would influence or appear to influence the work presented in this paper.
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. The authors also acknowledge Guo Yong Chia, Chan Wai Luen and Aldrich Chua for the experimental assistance with DED builds, Hammer Peening and Shot Peening, respectively. Authors thank Prof. Shiv Brat Singh, Prof. Ho Jia Hui, Dr Mark Hyunpong Jhon and Dr. Sun Zhongji for fruitful discussions.
Citation
Mithal, A., Maharjan, N. and Idapalapati, S. (2023), "Enhanced cooling rates in laser directed energy deposition with interlayer peening", Rapid Prototyping Journal, Vol. 29 No. 6, pp. 1289-1298. https://doi.org/10.1108/RPJ-11-2022-0395
Publisher
:Emerald Publishing Limited
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