Abstract
The selective laser melting (SLM) method is being increasingly applied in the aerospace and power industries for the production of high temperature critical components. The effects of SLM processing parameters, such as laser power, scanning speed, and energy density on the creep properties were investigated for 316L stainless steel (SS316L). The effect of building direction was also studied. The creep resistance was influenced by the manufacturing direction. The vertical specimen demonstrated a longer creep life and higher creep resistance than the horizontal specimen. The creep resistance remained constant when the energy density was kept constant during manufacturing. If insufficient energy density was used for manufacturing, internal defects, such as voids and unmelt powder were generated, and lowered the creep resistance. However, if sufficient energy density higher than a minimum value was employed, the material creep properties mainly depended on the level of the energy density.
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Abbreviations
- Ā :
-
Small punch creep coefficient
- \(\overline n \) :
-
Small punch creep exponent
- \(\dot \delta \) :
-
Small punch creep displacement rate
- v :
-
Scanning speed
- d :
-
Hatching distance
- e :
-
Layer thickness
- E :
-
Energy density
- P :
-
Punch load
- P Laser :
-
Laser power
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Acknowledgments
This work was partly supported by the KOEN (Proj. No. 2020-Hyunjang(Balun)-01) funded by Korea South-East Power Co. in 2020.
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Jae Hyeon Bae received his B.S. in Mechanical Engineering from Chung-Ang University. He is currently an M.S. candidate at Chung-Ang University. His research interests are high temperature fracture mechanics and creep fracture of additive manufactured components.
Jong Min Yu received his M.S. and Ph.D. degrees in Mechanical Engineering from Chung-Ang University. He is currently a Postdoctoral fellow at Chung-Ang University. His research interest is life and integrity assessment of facilities in power and process plants. He is currently involved in the study on mechanical properties of additive manufactured components with various process parameters.
Van Hung Dao received his M.S. and Ph.D. degrees in Mechanical Engineering from Chung-Ang University. He is currently a Postdoctoral fellow at KRISS. His research interests are microstructural analysis and application of high temperature fracture mechanics to life assessment of structural material. He is extending research to behavior of additive manufactured materials.
Vanno Lok received his B.S. in Industrial and Mechanical Engineering from Institute of Technology of Cambodia. He received M.S. and Ph.D. degrees in Mechanical Engineering from Chung-Ang University. He is currently a Postdoctoral fellow at Chung-Ang University. His research interests are stress analysis problems in pressure vessel & pi** application in power plants, microstructural analysis, and creep behavior of high temperature fracture mechanics to structural materials in life assessment.
Kee Bong Yoon received his B.S. in Mechanical Engineering from Seoul National University, M.S. from KAIST and Ph.D. from Georgia Institute of Technology. He is currently a Professor at Chung-Ang University. His research interests are high temperature fracture and risk based management of energy plants and semiconductor plants. He is extending his research to fracture of additive manufactured materials.
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Bae, J.H., Yu, J.M., Dao, V.H. et al. Effects of processing parameters on creep behavior of 316L stainless steel produced using selective laser melting. J Mech Sci Technol 35, 3803–3812 (2021). https://doi.org/10.1007/s12206-021-2103-x
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DOI: https://doi.org/10.1007/s12206-021-2103-x