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Microstructure and mechanical properties of high strength steel deposits obtained by Wire-Arc Additive Manufacturing

Article dans une revue avec comité de lecture
Author
BOURLET, Clément
224752 Institut de soudure [IS]
ZIMMER-CHEVRET, Sandra
ROBINEAU, Aurélien
224752 Institut de soudure [IS]
SCANDELLA, Fabrice
224752 Institut de soudure [IS]
107452 Laboratoire de Conception Fabrication Commande [LCFC]
ccPESCI, Raphaël
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

URI
http://hdl.handle.net/10985/19035
DOI
10.1016/j.jmatprotec.2020.116759
Date
2020
Journal
Journal of Materials Processing Technology

Abstract

Wire-arc additive manufacturing has become an alternative way to produce industrial parts. In this work 15 kg walls are built with an effective building rate of 4.85 kg/h using an ER100 wire providing good tensile properties and toughness under welding conditions. The thermal evolution of the walls during manufacturing is measured by thermocouples and an IR camera: it depends on process parameters, deposit strategy and the size of the part. The walls are then characterised as deposit and after heat treatment through hardness, tensile and Charpy-V notch tests. The results show a fine microstructure with unexpected retained austenite and coarse allotriomorphic ferrite in the as deposited walls. The final hardness values vary from about 220 to 280 HV2; the yield stress and tensile strength are 520 and 790 MPa, respectively, and a toughness of about 50 J is obtained at room temperature. The heat treatment transforms the retained austenite, leading to an improvement of the yield stress to 600 MPa.

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