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High-Efficiency Cooling System Using Additive Manufacturing

Woo Yeong-Jin, Nam Dong-Ho, Lee Seok-Rok, Kim Eun-Ah, Lee Woo-Jin, Yang Dong-Yeol, Yu Ji-Hun, Park Yong-Ho, Lee Hak-Sung

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 3

689--693

In this study, we propose a cooling structure manufactured using a specialized three-dimensional (3D) printing design method. A cooling performance test system with complex geometry that used a thermoelectric module was manufactured using metal 3D printing. A test model was constructed by applying additive manufacturing simulation and computational fluid analysis techniques, and the correlation between each element and cooling efficiency was examined. in this study, the evaluation was conducted using a thermoelectric module base cooling efficiency measurement system. The contents were compared and analyzed by predicting the manufacturing possibility and cooling efficiency, through additive manufacturing simulation and computational fluid analysis techniques, respectively.

Heat Treatment Effect on Physical Properties of Stainless Steel / Inconel Bonded by Directed Energy Deposition

Eom Yeong Seong, Kim Kyung Tae, Kim Dong Won, Yu Ji-Hun, Sim Chul Yong, An Seung Jun, Park Yong-Ha, Son Injoon

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 4

1049--1054

In this study, stainless steel 316L and Inconel 625 alloy powders were additively manufactured by using directed energy deposition process. And heat treatment effect on hardness and microstructures of the bonded stainless steel 316L/Inconel 625 sample was investigated. The microstructures shows there are no secondary phases and big inclusions near interfacial region between stainless steel 316L and Inconel 625 except several small cracks. The results of TEM and Vickers Hardness show the interfacial area have a few tens of micrometers in thickness. Interestingly, as the heat treatment temperature increases, the cracks in the stainless steel region does not change in morphology while both hardness values of stainless steel 316L and Inconel 625 decrease. These results can be used for designing pipes and valves with surface treatment of Inconel material based on stainless steel 316L material using the directed energy deposition.

Dual Speed Laser Remelting for High Densification in H13 Tool Steel Metal 3D Printing

Jung Im Doo, Choe Jungho, Yun Jaecheol, Yang Sangsun, Yang Dong-Yeol, Kim Yong-Jin, Yu Ji-Hun

Archives of Metallurgy and Materials

2019

Vol. 64, iss. 2

571--578

The densification behavior of H13 tool steel powder by dual speed laser scanning strategy have been characterized for selective laser melting process, one of powder bed fusion based metal 3d printing. Under limited given laser power, the laser re-melting increases the relative density and hardness of H13 tool steel with closing pores. The single melt-pool analysis shows that the pores are located on top area of melt pool when the scanning speed is over 400 mm/s while the low scanning speed of 200 mm/s generates pores beneath the melt pool in the form of keyhole mode with the high energy input from the laser. With the second laser scanning, the pores on top area of melt pools are efficiently closed with proper dual combination of scan speed. However pores located beneath the melt pools could not be removed by second laser scanning. When each layer of 3d printing are re-melted, the relative density and hardness are improved for most dual combination of scanning. Among the scan speed combination, the 600 mm/s by 400 mm/s leads to the highest relative density, 99.94% with hardness of 53.5 HRC. This densification characterization with H13 tool steel laser re-melting can be efficiently applied for tool steel component manufacturing via metal 3d printing.