Abstract
Creep behavior of 316L stainless steel was experimentally investigated using small punch (SP) specimens produced by the selective laser melting (SLM) with various processing parameters. Five rectangular blocks were fabricated from gas atomized powder using the SLM. Various combinations of the processing parameters were used in the SLM process, such as the scanning speed and the laser power, when the energy density was kept as a constant. The scanning speed was increased from 336 to 784 mm/s, while the laser power was simultaneously increased from 165 to 385 W. The microstructural characteristics of each block were examined to verify the manufacturing conditions. Internal defects such as pores and un-melted powder were observed in the specimens fabricated when the low laser power was used. Small punch (SP) creep tests were carried out at 650 °C in the applied load range of 320–550 N. Creep-rupture life and Norton’s power law creep deformation constants were measured. The results showed that even though the energy density condition was same for all of the creep specimens, those with higher laser power showed better creep resistance. Since it was known that a higher scanning speed could deteriorate the creep resistance, the higher creep resistance under the high scanning speed condition was indebted to the higher laser power used. The observed creep behavior of the SLM blocks was explained in relation to the microstructures.
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Abbreviations
- \(\mathop {\overline o }\limits^ \cdot \) :
-
Small punch creep displacement rate
- P :
-
Small punch load
- \(\overline A \) :
-
Small punch creep coefficient
- \(\overline n \) :
-
Small punch creep exponent
- t r :
-
Creep rupture life
- P Laser :
-
Laser power
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Acknowledgments
This work was supported by a Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant (number 2014 1010101850), funded by the Ministry of Trade, Industry and Energy (MOTIE).
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Jong Min Yu received his M.S. in Mechanical Engineering from Chung-Ang University. He is currently a Ph.D. candidate in Chung-Ang University. His research interest is life and integrity assessment of facilities in power and process plants. He is also interested in creep fracture of additive manufactured components.
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 Chung-Ang University. 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.
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 research to fracture of additive manufactured materials.
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Yu, J.M., Dao, V.H. & Yoon, K.B. Investigation of creep behavior of 316L stainless steel produced by selective laser melting with various processing parameters. J Mech Sci Technol 34, 3249–3259 (2020). https://doi.org/10.1007/s12206-020-0717-z
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DOI: https://doi.org/10.1007/s12206-020-0717-z