Modeling the melt pool of the laser sintered Ti6Al4V layers with Goldak's double-ellipsoidal heat source

E. Soylemez

Modeling the melt pool of the laser sintered Ti6Al4V layers with Goldak's double-ellipsoidal heat source

E. Soylemez^*

^*Corresponding author for this work

Marmara University

Research output: Contribution to conference › Paper › peer-review

10 Citations (Scopus)

Abstract

Selective laser melting process has been widely studied to elucidate the effects of process parameters (laser speed, laser power, scan strategy, hatch distance, layer thickness, etc.) on the manufactured parts. Experimental and numerical modeling studies have been investigating the melt pool shapes of the laser sintered layers to correlate the melt pool geometry with the part quality. Although modeling results agree with the experiments, the melt pool cross-section may form key holing rather than semi-circular shape due to Marangoni effect, recoil pressure, and sudden evaporation for some process parameters combinations. To accurately model the melt pool depth, this study proposes a finite element analysis (FEA) model that simulates the laser source as the Goldak's double-ellipsoidal heat power density model. Single bead experiments of Ti6Al4V were conducted within the processing range of laser sintering system with the 400 W laser, and these experimental results allowed to verify simulated FEA results.

Original language	English
Pages	1721-1736
Number of pages	16
Publication status	Published - 2020
Externally published	Yes
Event	29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018 - Austin, United States Duration: 13 Aug 2018 → 15 Aug 2018

Conference

Conference	29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018
Country/Territory	United States
City	Austin
Period	13/08/18 → 15/08/18

Bibliographical note

Publisher Copyright:
© Solid Freeform Fabrication 2018: Proceedings of the 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018. All Rights Reserved.

Funding

The author wishes to acknowledge Mert Coskun of the Fatih Sultan Mehmet University for performing the experiments and helping with the experimental planning. The author also would like to thank Michael Gouge and Sualp Ozel for their guidance on the Netfabb Simulation practices. The author also thanks to Semih Guven, a technical staff at the Marmara University for helping to polish the experimental samples, and Anil Gorkem Yekdes, an undergraduate student for helping the post-processing of the experimental and the numerical analysis data. The author gratefully acknowledges The Scientific and Technological Research Council of Turkey (TÜBITAK) through Project No: 216M033.

Funders	Funder number
Mert Coskun of the Fatih Sultan Mehmet University
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu	216M033
Marmara Üniversitesi

Keywords

Finite Element Analysis
Keyhole
Process map
Selective Laser Melting

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Cite this

@conference{e4e8d01be1e448e1a3b3e01105ff1c35,

title = "Modeling the melt pool of the laser sintered Ti6Al4V layers with Goldak's double-ellipsoidal heat source",

abstract = "Selective laser melting process has been widely studied to elucidate the effects of process parameters (laser speed, laser power, scan strategy, hatch distance, layer thickness, etc.) on the manufactured parts. Experimental and numerical modeling studies have been investigating the melt pool shapes of the laser sintered layers to correlate the melt pool geometry with the part quality. Although modeling results agree with the experiments, the melt pool cross-section may form key holing rather than semi-circular shape due to Marangoni effect, recoil pressure, and sudden evaporation for some process parameters combinations. To accurately model the melt pool depth, this study proposes a finite element analysis (FEA) model that simulates the laser source as the Goldak's double-ellipsoidal heat power density model. Single bead experiments of Ti6Al4V were conducted within the processing range of laser sintering system with the 400 W laser, and these experimental results allowed to verify simulated FEA results.",

keywords = "Finite Element Analysis, Keyhole, Process map, Selective Laser Melting",

author = "E. Soylemez",

note = "Publisher Copyright: {\textcopyright} Solid Freeform Fabrication 2018: Proceedings of the 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018. All Rights Reserved.; 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018 ; Conference date: 13-08-2018 Through 15-08-2018",

year = "2020",

language = "English",

pages = "1721--1736",

}

TY - CONF

T1 - Modeling the melt pool of the laser sintered Ti6Al4V layers with Goldak's double-ellipsoidal heat source

AU - Soylemez, E.

N1 - Publisher Copyright: © Solid Freeform Fabrication 2018: Proceedings of the 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018. All Rights Reserved.

PY - 2020

Y1 - 2020

N2 - Selective laser melting process has been widely studied to elucidate the effects of process parameters (laser speed, laser power, scan strategy, hatch distance, layer thickness, etc.) on the manufactured parts. Experimental and numerical modeling studies have been investigating the melt pool shapes of the laser sintered layers to correlate the melt pool geometry with the part quality. Although modeling results agree with the experiments, the melt pool cross-section may form key holing rather than semi-circular shape due to Marangoni effect, recoil pressure, and sudden evaporation for some process parameters combinations. To accurately model the melt pool depth, this study proposes a finite element analysis (FEA) model that simulates the laser source as the Goldak's double-ellipsoidal heat power density model. Single bead experiments of Ti6Al4V were conducted within the processing range of laser sintering system with the 400 W laser, and these experimental results allowed to verify simulated FEA results.

AB - Selective laser melting process has been widely studied to elucidate the effects of process parameters (laser speed, laser power, scan strategy, hatch distance, layer thickness, etc.) on the manufactured parts. Experimental and numerical modeling studies have been investigating the melt pool shapes of the laser sintered layers to correlate the melt pool geometry with the part quality. Although modeling results agree with the experiments, the melt pool cross-section may form key holing rather than semi-circular shape due to Marangoni effect, recoil pressure, and sudden evaporation for some process parameters combinations. To accurately model the melt pool depth, this study proposes a finite element analysis (FEA) model that simulates the laser source as the Goldak's double-ellipsoidal heat power density model. Single bead experiments of Ti6Al4V were conducted within the processing range of laser sintering system with the 400 W laser, and these experimental results allowed to verify simulated FEA results.

KW - Finite Element Analysis

KW - Keyhole

KW - Process map

KW - Selective Laser Melting

UR - http://www.scopus.com/inward/record.url?scp=85075893624&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:85075893624

SP - 1721

EP - 1736

T2 - 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018

Y2 - 13 August 2018 through 15 August 2018

ER -

Modeling the melt pool of the laser sintered Ti6Al4V layers with Goldak's double-ellipsoidal heat source

Abstract

Conference

Bibliographical note

Funding

Keywords

UN SDGs

Other files and links

Fingerprint

Cite this