PSI - Issue 71

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 71 (2025) 302–308

5 th International Structural Integrity Conference & Exhibition (SICE 2024) Investigating the Effect of Direct Aging and Stress Relieving Treatment on Microstructure and Mechanical Properties of AlSi10Mg Fabricated through LPBF R. Anil Kumar a,b,* Shaik Ansar Ghousiya Nahid a , Chaitanya Joshi b , Rajesh K. Khatirkar b , R. N. Chouhan a , Anupam Agnihotri a a Jawaharlal Nehru Aluminium Research Development & Design Centre (JNARDDC), Amravati Road, Nagpur, Maharashtra – 440023, India b Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), South Ambazari Road, Nagpur, Maharashtra – 440010, India Abstract The ability of additive manufacturing (AM) technology in producing near-net shaped and functional grade metallic parts has led to its wide acceptance and usage in several mainstream sectors like aerospace, automotive, biomedical etc. Additionally, the evolution of cost-efficient production machines helped in rapid adoption of the AM technologies for commercial production. Aluminium and its alloys have high strength-to weight ratio, reasonable mechanical properties, good corrosion resistance and high conductivity and hence are widely used in automobile and aerospace industries. AlSi10Mg is one of the popular commercial AM alloy and it was tested for several aerospace applications like aircraft oil cooler, star tracker camera bracket, etc. Since, AM imparts unique microstructural characteristics to AlSi10Mg and conventional T6 heat treatment destroys these characteristics, several new heat treatments have been proposed for AlSi10Mg manufactured through AM. However, there is a temperature gap between direct ageing and stress relieving treatments, which are not very well investigated. This work investigates the effect of direct ageing (DA) at 245 °C on microstructure and mechanical properties in AlSi10Mg fabricated using laser bed fusion (LPBF) technology. The properties of DA samples are analysed and compared with as-built and stress-relieving treatment (T5). © 2025 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 SICE 2024 organizers

Keywords: AlSi10Mg; Direct Ageing; modified heat treatment; microstructure; mechanical properties

1. Introduction Metal additive manufacturing (AM) is gaining momentum in aerospace industries replacing conventional parts in non-critical structural applications for reasons mainly attributing to good savings in material both in development and

Corresponding author. E-mail address: anil.6510@gmail.com 3216 © 2025 The

Authors.

Published

by

ELSEVIER

B.V.

2452-3216 © 2025 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 SICE 2024 organizers 10.1016/j.prostr.2025.08.041