Wire-arc additive manufactured nickel aluminum bronze with enhanced mechanical properties using heat treatments cycles

Dharmendra, C. and Amirkhiz, B.S. and Lloyd, A. and G D, Janaki Ram and Mohammadi, M. (2020) Wire-arc additive manufactured nickel aluminum bronze with enhanced mechanical properties using heat treatments cycles. Additive Manufacturing, 36 (101510). pp. 1-16. ISSN 2214-8604

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Abstract

Wire-arc additive manufacturing (WAAM) technique was used to develop nickel aluminum bronze (NAB) components for naval applications. The microstructural changes were characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with energy dispersive spectroscopy (EDS). As-built WAAM-NAB consists of κII (globular Fe3Al) and κIII (lamellar NiAl) phases in the interdendritic regions and fine Fe-rich κIV particles in the Cu-matrix. Along the build direction, the WAAM-NAB flat samples exhibited yield and ultimate tensile strength values of 380 and 708 MPa, respectively, and 34 % elongation. Furthermore, three different heat-treatments were performed on the samples in a view to evaluating their effect on mechanical properties. When heat-treated to 350 °C for 2 h (HT-1), there are no significant microstructural changes, and tensile properties along the build direction are similar to the as-built WAAM-NAB. Heat-treatment at 550 °C for 4 h (HT-2) produced a new needle-like κv phase in the α-matrix, coarsening of globular κII, partial spheroidization of lamellar κIII, and reduced amount of κIV precipitation. As compared to the WAAM-NAB, HT-2 samples exhibited a significant increase in yield strength (∼90 MPa), and ultimate tensile strength (∼60 MPa); however, tensile ductility was observed to drop by 20 %. After heat-treatment at 675 °C for 6 h (HT-3), globular κII and needle-like κv were coarsened, lamellar κIII was completely spheroidized, and the amount of κIV was significantly reduced. HT-3 samples showed better tensile strength (∼37 MPa) than the WAAM-NAB with marginal loss (6%) in the ductility. © 2020

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IITH Creators:

IITH Creators	ORCiD
G D, Janaki Ram	https://orcid.org/0000-0002-7580-763X

Item Type:

Article

Additional Information:

The authors would like to thank Natural Sciences and Engineering Research Council of Canada (NSERC) grant number RGPIN-2016-04221 , New Brunswick Innovation Foundation (NBIF) grant number RIF 2018-005 , Atlantic Canada Opportunity Agency (ACOA)- Atlantic Innovation Fund (AIF) project number 210414, Mitacs Accelerate Program grant number IT10669 for providing sufficient funding to execute this work. The authors would like to acknowledge Alexander Riemann of Gefertec GmbH for fabricating the nickel aluminum bronze via wire-arc additive manufacturing technique, Dr. Douglas Hall and Steven Cogswell at UNB’s Microscopy and Microanalysis Facility for SEM, and Pei Liu and Catherine Bibby at CanmetMATERIALS for TEM sample preparations.

Uncontrolled Keywords:

Electron microscopy; Heat treatment; Nickel aluminum bronze (NAB); Tensile properties; Wire-arc additive manufacturing (WAAM); κ-Phases

Subjects:

Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

Ms Palak Jain

Date Deposited:

25 Nov 2022 09:54

Last Modified:

25 Nov 2022 09:54