Densifying method in additive manufacturing process of H13 tool steel : laser re-melting

AISI H13 tool steel structures were fabricated by selective laser melting which is one of the metal additive manufacturing process. Scanning speed of laser was controlled in the ranging of 100-1000 mm/s to optimize the process parameter to fabricate the highly densified structure. Laser power, hatch...

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Main Authors: Choe, Jungho, Jung, Im Doo, Yun, Jaecheol, Yang, Sangsun, Yu, Ji-Hun, Yang, Dong-Yeol, Kim, Yong-Jin
Other Authors: School of Mechanical and Aerospace Engineering
Format: Conference or Workshop Item
Language:English
Published: 2018
Subjects:
Online Access:https://hdl.handle.net/10356/88291
http://hdl.handle.net/10220/45776
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-882912020-09-24T20:10:35Z Densifying method in additive manufacturing process of H13 tool steel : laser re-melting Choe, Jungho Jung, Im Doo Yun, Jaecheol Yang, Sangsun Yu, Ji-Hun Yang, Dong-Yeol Kim, Yong-Jin School of Mechanical and Aerospace Engineering Proceedings of the 3rd International Conference on Progress in Additive Manufacturing (Pro-AM 2018) Singapore Centre for 3D Printing Additive Manufacturing DRNTU::Engineering::Mechanical engineering::Prototyping Selective Laser Melting AISI H13 tool steel structures were fabricated by selective laser melting which is one of the metal additive manufacturing process. Scanning speed of laser was controlled in the ranging of 100-1000 mm/s to optimize the process parameter to fabricate the highly densified structure. Laser power, hatch space and layer thickness were fixed at 90 W, 80 μm and 25 μm. Under 200 mm/s, spherical shape pores were observed and irregular shape pores were observed in over 400 mm/s samples. Residual pores were not easily removed by changing laser scanning speed alone and laser re-melting technique was applied to solve the pore problem. Each layers were exposed twice to laser with various scanning speed before re-coating the powder for next layer. Spherical shape pores were observed from all of the specimen exposed under 200 mm/s irrespective of another exposed laser speed. While re-melting over scanning speed of 800 mm/s did not showed effect on the densification, the combination of first scanning speed (400 mm/s) and second scanning speed (600 mm/s) showed the significant reduction of pores. Published version 2018-08-30T09:10:29Z 2019-12-06T16:59:59Z 2018-08-30T09:10:29Z 2019-12-06T16:59:59Z 2018 Conference Paper Choe, J., Yun, J., Jung, I. D., Yang, D.-Y., Yang, S., Kim, Y.- J., & Yu, J.-H. (2018). Densifying method in additive manufacturing process of H13 tool steel: laser re-melting. Proceedings of the 3rd International Conference on Progress in Additive Manufacturing (Pro-AM 2018), 232-236. doi:10.25341/D4DW27 https://hdl.handle.net/10356/88291 http://hdl.handle.net/10220/45776 10.25341/D4DW27 en © 2018 Nanyang Technological University. Published by Nanyang Technological University, Singapore. 5 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Additive Manufacturing
DRNTU::Engineering::Mechanical engineering::Prototyping
Selective Laser Melting
spellingShingle Additive Manufacturing
DRNTU::Engineering::Mechanical engineering::Prototyping
Selective Laser Melting
Choe, Jungho
Jung, Im Doo
Yun, Jaecheol
Yang, Sangsun
Yu, Ji-Hun
Yang, Dong-Yeol
Kim, Yong-Jin
Densifying method in additive manufacturing process of H13 tool steel : laser re-melting
description AISI H13 tool steel structures were fabricated by selective laser melting which is one of the metal additive manufacturing process. Scanning speed of laser was controlled in the ranging of 100-1000 mm/s to optimize the process parameter to fabricate the highly densified structure. Laser power, hatch space and layer thickness were fixed at 90 W, 80 μm and 25 μm. Under 200 mm/s, spherical shape pores were observed and irregular shape pores were observed in over 400 mm/s samples. Residual pores were not easily removed by changing laser scanning speed alone and laser re-melting technique was applied to solve the pore problem. Each layers were exposed twice to laser with various scanning speed before re-coating the powder for next layer. Spherical shape pores were observed from all of the specimen exposed under 200 mm/s irrespective of another exposed laser speed. While re-melting over scanning speed of 800 mm/s did not showed effect on the densification, the combination of first scanning speed (400 mm/s) and second scanning speed (600 mm/s) showed the significant reduction of pores.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Choe, Jungho
Jung, Im Doo
Yun, Jaecheol
Yang, Sangsun
Yu, Ji-Hun
Yang, Dong-Yeol
Kim, Yong-Jin
format Conference or Workshop Item
author Choe, Jungho
Jung, Im Doo
Yun, Jaecheol
Yang, Sangsun
Yu, Ji-Hun
Yang, Dong-Yeol
Kim, Yong-Jin
author_sort Choe, Jungho
title Densifying method in additive manufacturing process of H13 tool steel : laser re-melting
title_short Densifying method in additive manufacturing process of H13 tool steel : laser re-melting
title_full Densifying method in additive manufacturing process of H13 tool steel : laser re-melting
title_fullStr Densifying method in additive manufacturing process of H13 tool steel : laser re-melting
title_full_unstemmed Densifying method in additive manufacturing process of H13 tool steel : laser re-melting
title_sort densifying method in additive manufacturing process of h13 tool steel : laser re-melting
publishDate 2018
url https://hdl.handle.net/10356/88291
http://hdl.handle.net/10220/45776
_version_ 1681056211185696768