Effect of Laser Power on the Recrystallization Temperature of an Additively Manufactured IN718

Over the past few decades, there has been much research on additive manufacturing in both the academic and the industrial spheres to overcome the limitations of conventional manufacturing methods, thereby enabling the production of complex designs for improved performance. To achieve this purpose, i...

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Bibliographic Details
Published inMetals (Basel ) Vol. 13; no. 8; p. 1355
Main Authors Son, Deuk Hyun, Kim, In Soo, Choi, Baig-Gyu, Do, Jeonghyeon, Choi, Yoon Suk, Jung, Joong Eun
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2023
Subjects
3D printing
Additive manufacturing
Cooling rate
Crystal defects
driving force for recrystallization during laser powder bed fusion
Ductility
Energy management systems
Gas turbines
Grain size
Heat resistance
IN718
laser powder bed fusion
Lasers
Manufacturing
Mechanical properties
Melt pools
OEM
Production methods
Recrystallization
recrystallization temperature
Residual stress
Thermal stress
United States > US
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Summary:Over the past few decades, there has been much research on additive manufacturing in both the academic and the industrial spheres to overcome the limitations of conventional manufacturing methods, thereby enabling the production of complex designs for improved performance. To achieve this purpose, it is crucial to meticulously set suitable laser parameters within the context of microstructural characteristics, including type and fraction of defects, texture development, residual stress, and grain size, etc. In the present study, we focused on recrystallization behavior, a type of relaxation process for accumulated thermal stress during the L-PBF process, as a function of laser power applied on the L-PBF process. The laser power has significant effects on the amount of recrystallized grain, directly related to the recrystallization temperature. Within the range of laser power used in this study, a downward trend was observed in the recrystallization temperature as the laser power increased from 370 W to 390 W. This trend suggests that higher laser power leads to a faster cooling rate, influenced by the volume of melt pool as well as the amount of heat dissipation from the melt pool, resulting in higher thermal stress during the process.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13081355