Title: Microstructural and mechanical characteristics of 308L stainless steel walls manufactured by wire arc additive manufacturing with interpass time variation

Authors: Cássio Emanuel Ribeiro Martins; Ariel Rodriguez Arias; Hellen Cristine Prata de Oliveira; Fagner Guilherme Ferreira Coelho

Addresses: Departamento de Engenharia Mecânica, Universidade Federal de Minas Gerais (UFMG-PPGMEC), Avenida Antônio Carlos, 6627, Pampulha – Belo Horizonte/MG – CEP: 31.270-901, Brazil ' Departamento de Engenharia Mecânica, Universidade Federal de Minas Gerais (UFMG-PPGMEC), Avenida Antônio Carlos, 6627, Pampulha – Belo Horizonte/MG – CEP: 31.270-901, Brazil ' Centre for Innovation and Technology –SENAI, Rua Michel Echenique, 2000, Horto – Belo Horizonte/MG – CEP: 31035-536, Brazil ' Departamento de Engenharia Mecânica, Universidade Federal de Minas Gerais (UFMG-PPGMEC), Avenida Antônio Carlos, 6627, Pampulha – Belo Horizonte/MG – CEP: 31.270-901, Brazil

Abstract: The wire arc additive manufacturing (WAAM), uses conventional welding process, the parts experience a build-up of heat, which influences their microstructural and macrostructural properties. This article analyses the influence of the time interval between passes on the properties of components produced using 308L stainless steel. Two walls were built with natural convection cooling conditions, with time intervals from 60 to 180 seconds. The tensile tests showed similar results, however, there was a difference in the hardness of the intermediate region between the two-time conditions analysed. Consequently, the wall that underwent a cooling interval of 180 seconds showed higher hardness values. The results suggest that cooling by the time between the deposition could be a viable approach to improving the properties of 308L stainless steel components manufactured using the WAAM process. [Submitted 1 August 2024; Accepted 17 April 2025]

Keywords: additive manufacturing; 308 L stainless steel; microstructure; hardness; tensile.

DOI: 10.1504/IJMR.2025.150043

International Journal of Manufacturing Research, 2025 Vol.20 No.1, pp.90 - 106

Received: 01 Aug 2024
Accepted: 17 Apr 2025
Published online: 23 Nov 2025 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article