Wire arc additive manufacturing of ER70S-6/316L bimetal joint

Additive manufacturing has been a transformative approach to industrial production. It delivers advantages of improved mechanical properties, complex geometries, and simplified fabrication. Wire arc additive manufacturing (WAAM) has the highest deposition rate among various metal additive manufactur...

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Main Author: Ndayambaje, Kaboba Bienvenu
Other Authors: Zhou Wei
Format: Thesis-Master by Coursework
Language:English
Published: Nanyang Technological University 2024
Subjects:
Online Access:https://hdl.handle.net/10356/177597
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1775972024-06-01T16:57:04Z Wire arc additive manufacturing of ER70S-6/316L bimetal joint Ndayambaje, Kaboba Bienvenu Zhou Wei School of Mechanical and Aerospace Engineering MWZHOU@ntu.edu.sg Engineering WAAM ER70S-6 316L Bimetal joint Additive manufacturing has been a transformative approach to industrial production. It delivers advantages of improved mechanical properties, complex geometries, and simplified fabrication. Wire arc additive manufacturing (WAAM) has the highest deposition rate among various metal additive manufacturing techniques. The WAAM process usually starts to print the first layer on a starting substrate. The substrate could be a functional part of the WAAM-built components. Therefore, the interface of the WAAM-built structure and the substrate should be studied. In this work, the ER70S-6 wall was built directly using WAAM process on a 316L stainless steel substrate. Metallurgical study was conducted to investigate bonding of the two materials at the interface and revealed a diffusion of alloying elements from the substrate to the interface, and the upper layers of as-built structure and formation of martensite phase at the interface regions and ferrite at the upper layers. In addition, microhardness test and tensile test were conducted to investigate the mechanical properties of the bimetal joint. Microhardness test revealed the variation of hardness property along the layers, and the notable boost was obtained at the first layer with an average peak value of 354.4 ± 11.2 HV. Tensile test conducted with DIC analysis revealed that high tensile strain deformation shifted from the 316L substrate to the WAAM ER70S-6 side of the material where necking and fracturing occurred as the weakest point. The interface of the bimetal joint exhibited a very low tensile strain which was attributed to the transformation of a martensite phase in this region. Master's degree 2024-05-29T03:34:31Z 2024-05-29T03:34:31Z 2024 Thesis-Master by Coursework Ndayambaje, K. B. (2024). Wire arc additive manufacturing of ER70S-6/316L bimetal joint. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/177597 https://hdl.handle.net/10356/177597 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
WAAM
ER70S-6
316L
Bimetal joint
spellingShingle Engineering
WAAM
ER70S-6
316L
Bimetal joint
Ndayambaje, Kaboba Bienvenu
Wire arc additive manufacturing of ER70S-6/316L bimetal joint
description Additive manufacturing has been a transformative approach to industrial production. It delivers advantages of improved mechanical properties, complex geometries, and simplified fabrication. Wire arc additive manufacturing (WAAM) has the highest deposition rate among various metal additive manufacturing techniques. The WAAM process usually starts to print the first layer on a starting substrate. The substrate could be a functional part of the WAAM-built components. Therefore, the interface of the WAAM-built structure and the substrate should be studied. In this work, the ER70S-6 wall was built directly using WAAM process on a 316L stainless steel substrate. Metallurgical study was conducted to investigate bonding of the two materials at the interface and revealed a diffusion of alloying elements from the substrate to the interface, and the upper layers of as-built structure and formation of martensite phase at the interface regions and ferrite at the upper layers. In addition, microhardness test and tensile test were conducted to investigate the mechanical properties of the bimetal joint. Microhardness test revealed the variation of hardness property along the layers, and the notable boost was obtained at the first layer with an average peak value of 354.4 ± 11.2 HV. Tensile test conducted with DIC analysis revealed that high tensile strain deformation shifted from the 316L substrate to the WAAM ER70S-6 side of the material where necking and fracturing occurred as the weakest point. The interface of the bimetal joint exhibited a very low tensile strain which was attributed to the transformation of a martensite phase in this region.
author2 Zhou Wei
author_facet Zhou Wei
Ndayambaje, Kaboba Bienvenu
format Thesis-Master by Coursework
author Ndayambaje, Kaboba Bienvenu
author_sort Ndayambaje, Kaboba Bienvenu
title Wire arc additive manufacturing of ER70S-6/316L bimetal joint
title_short Wire arc additive manufacturing of ER70S-6/316L bimetal joint
title_full Wire arc additive manufacturing of ER70S-6/316L bimetal joint
title_fullStr Wire arc additive manufacturing of ER70S-6/316L bimetal joint
title_full_unstemmed Wire arc additive manufacturing of ER70S-6/316L bimetal joint
title_sort wire arc additive manufacturing of er70s-6/316l bimetal joint
publisher Nanyang Technological University
publishDate 2024
url https://hdl.handle.net/10356/177597
_version_ 1800916110408679424