Work

Wire arc additive manufacturing of nanomodified 2024 alloy

Year: 2023

Type: article

Abstract: Wire arc additive manufacturing (WAAM) has the objective of reducing the fabrication cost and time, as well as the material waste. This technology enables the manufacturing of complex parts near to net shape and as a result, allows greater design freedom. The use of Cold Metal Transfer (CMT) technology facilitates the welding of aluminium alloys susceptible to hot cracking due to the low heat input. One variant of this process, CMT pulsed advance (CMT-PADV), reduces this heat input even more in addition to using alternate polarity, which helps reducing porosity. In this study, nanomodified 2024 alloy is investigated for WAAM applications. Al-Cu aluminium alloys are usually considered non weldable and are highly susceptible to hot cracking. Addition of TiC nanoparticles to the wire enhances nucleation during liquid solid transformation, reducing the size of grains and segregation obtaining as a result a fine equiaxed microstructure. This completely avoids hot cracking of walls and contributed to achieve high isotropic strength after precipitation hardening treatment above 370 MPa yield stress, 450 MPa tensile strength and 4% elongation.

Source: Materials Letters

DOI: 10.1016/j.matlet.2023.134712

Authors: Maider Arana, Eneko Ukar, David Aguilar, Pedro Álvarez

Institutions: University of the Basque Country, IK4-Lortek

Language: English

Topic: Additive Manufacturing Materials and Processes

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: hybrid

Estimated APC paid: $2,220