PSI - Issue 56

ScienceDirect Available online at www.sciencedirect.com ‹‡ ‡ ‹”‡ – Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com

www.elsevier.com/locate/procedia

Procedia Structural Integrity 56 (2024) 184–189

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the SIRAMM23 organizers Abstract In this work, transient thermomechanical analysis of the laser-based Directed Energy Deposition (DED) process was carried out to predict melt pool dimensions, thermal cycles and residual stress during Titanium Aluminide (TiAl) plate deposition. The predicted melt pool length, width, and depth increased as the laser power was increased from 250 W to 350 W at a constant travel speed of 15 mm/s. The melt pool length increased from 0.425 mm to 0.55 mm, while the depth increased from 0.1 to 0.29 mm, and the width increased from 0.412 to 0.5 mm. The plate's edges (tracks 1 and 6) were found to experience a slightly higher temperature than the middle tracks, which may contribute to higher thermal gradients at the edges. The highest Principal stress of 140 MPa was found in track 1. The magnitude of Principal stresses diminished as track deposition progressed from track 2 to 6 due to the variation of the thermal gradient along the tracks. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the SIRAMM23 chairpersons Keywords: γ -TiAl Alloy; Laser Metal Deposition; Melt Pool; Thermal Cycles; Residual Stress 1. Introduction Metal Additive Manufacturing (MAM) is an innovative process wherein the digital data in the form of a Computer Aided Design (CAD) file is used to build a prototype or fully functional components without fixtures and tooling, International Conference on Structural Integrity and Reliability of Advanced Materials obtained through Additive Manufacturing (SIRAMM23) Computational Modeling of Directed Energy Deposition of Titanium Aluminide Plate Geometries Balichakra Mallikarjuna a ,* ƒ ‡’ƒ”–‡– ‘ˆ ”‘†— –‹‘ ‰‹‡‡”‹‰ǡ ƒ–‹‘ƒŽ •–‹–—–‡ ‘ˆ ‡ Š‘Ž‘‰› ‹”— Š‹”ƒ’’ƒŽŽ‹ǡ ƒ‹Ž ƒ†—ǡ †‹ƒ

* Corresponding author. Tel.: +91 8310 405 141; fax: +0-000-000-0000 . E-mail address: ƒŽŽ—„ƒŽ‹ Šƒ”ƒ̷ ‰ƒ‹ŽǤ ‘ ƒ† ƒŽŽ‹̷ ‹––Ǥ‡†—

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the SIRAMM23 chairpersons

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the SIRAMM23 organizers 10.1016/j.prostr.2024.02.054