Abstract
A practical method is proposed to control the direction of crack propagation and to generate a crack-growth-proof (CGP) zone on a metal plate using laser induced line patterns: heat treatment and cladding. To evaluate the effect on crack propagation by the line patterns, we fabricated and tested diverse line-pattern shapes on a thin SUS316 plate of 1 mm thickness, such as single vertical line; one, three, and five horizontal lines; one and three 45°-tilted lines; X-shaped lines; and rectangular box lines by both laser heat treatment and cladding process. For description of metallurgical change via the pattern and its effect on the crack growth, we did a microstructural analysis of the treated SUS316 specimen. For example, ultimate tensile stress (σu) and fracture strain changed according to the pattern shapes. A specimen treatiing a rectangular line pattern of 4×20 mm showed an increase of σu to about 8.8 %, and fracture strain also increased by 10 % compared to that of a SUS316 plate. Through this work, we verified that the CGP zone could be controlled on a thin metal plate using the proposed method for protection of highly valuable mechanical parts mounted on it.
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A5A808320112), and also was granted financial support from the Basic Science Research Program through the NRF (No. 2020R1F1A106937411).
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Yeong Kwan Jo is currently a Ph.D. student in Mechanical Engineering at Pusan National University. His research topics are development of cladding process and its application to surface mechanical characteristics.
Jae Hyun Yu is a researcher in Advanced Surface Process Group at the Korea Institute of Industrial Technology. He earned his Ph.D. in Mechanical Engineering at Pusan National University in 2019. His research fields are development of additive manufacturing and its application to repairing.
Ki Yong Lee is a Principal Researcher in Smart Mobility Material Parts R&D Group at Korea Institute of Industrial Technology. He earned his M.S. and Ph.D. in Mechanical Engineering at Pusan National University in 1994 and 2001. His research fields are the engineering for additive manufacturing, especially direct energy deposition (DED).
Do Sik Shim received his Ph.D. in Mechanical Engineering from KAIST, Korea in 2010. He has been an Assistant Professor at Korea Maritime and Ocean University (KMOU) since 2017. His research interests include incremental and roll forming for sheet metal, direct energy deposition (DED) and structural analysis as well as optimal design.
Sang Hu Park is a Professor of Mechanical Engineering at Pusan National University. He earned his M.S. and Ph.D. in Mechanical Engineering at KAIST in 1996 and 2006, respectively. His research fields are the engineering for additive manufacturing, sheet metal forming, and nanofabrication.
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Jo, YK., Yu, JH., Lee, KY. et al. Control of crack propagation on SUS316 plate by laser-induced patterning: heat treatment and cladding. J Mech Sci Technol 34, 4711–4719 (2020). https://doi.org/10.1007/s12206-020-1028-0
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DOI: https://doi.org/10.1007/s12206-020-1028-0