Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/106822
Title: A thermo-metallurgical-mechanical model for selective laser melting of Ti6Al4V
Authors: Li, Biao
Zhou, Kun
Tan, Pengfei
Shen, Fei
Keywords: 3D Printing
Selective Laser Melting
Engineering::Mechanical engineering
Issue Date: 2019
Source: Tan, P., Shen, F., Li, B., & Zhou, K. (2019). A thermo-metallurgical-mechanical model for selective laser melting of Ti6Al4V. Materials & Design, 168, 107642-. doi:10.1016/j.matdes.2019.107642
Series/Report no.: Materials & Design
Abstract: A thermo-metallurgical-mechanical coupling model is developed to predict temperature, solid-state phase and residual stress fields for the multi-track multi-layer selective laser melting process of Ti6Al4V. The model considers the solid-state phase transformation (SSPT) and powder-liquid-solid transition which includes melting, vaporization, solidification, shrinkage and cooling phenomena. The thermal analysis is based on the transient heat conduction problem with a volumetric heat source describing the laser absorption and scattering in the powder bed. The volume fraction evolution of metallurgical phases is determined by temperature history and used to obtain the volumetric change strain due to the SSPT. An elasto-plastic constitutive law considering the strains that are induced by thermal gradients and the SSPT is proposed to evaluate stress fields. Modelling results reveal that the consideration of the SSPT leads to the decrease of tensile residual stresses and increase of compressive residual stresses, and the residual stress component in the scanning direction is larger than the other two stress components.
URI: https://hdl.handle.net/10356/106822
http://hdl.handle.net/10220/49642
ISSN: 0261-3069
DOI: http://dx.doi.org/10.1016/j.matdes.2019.107642
Rights: © 2019 Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SC3DP Journal Articles

Files in This Item:
File Description SizeFormat 
A thermo-metallurgical-mechanical model for selective laser melting of Ti6Al4V.pdf4.37 MBAdobe PDFThumbnail
View/Open

Google ScholarTM

Check

Altmetric

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.