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Microstructure and Mechanical Properties of AISI 420 Stainless Steel Produced by Wire Arc Additive Manufacturing

  • Jonas LundeEmail author
  • Mostafa Kazemipour
  • Salar Salahi
  • Ali Nasiri
Conference paper
  • 460 Downloads
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Wire arc additive manufacturing (WAAM) with a high deposition rate and reduced feedstock material’s waste was used to fabricate thin wall of AISI 420 stainless steel (SS). The microstructure of the fabricated wall was investigated in detail utilizing optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD), while the mechanical properties were characterized by conducting Vickers microhardness measurement and uniaxial tensile testing. The microstructural analysis results confirmed that the as-printed microstructure of the WAAM-420 SS is mainly composed of a martensitic matrix along with retained austenite and delta ferrite phases. Comparing the obtained yield strength (YS), ultimate tensile strength (UTS), and elongation of the fabricated wall along the deposition direction versus the building direction revealed isotropic mechanical properties. All tensile samples regardless of their directions fractured in a brittle manner at a high tensile strength were ascribed to the martensitic nature of the as-printed alloy. The correlations of the as-printed microstructure and the measured mechanical properties of the fabricated wall are discussed thoroughly.

Keywords

Microstructure Mechanical properties Wire arc Additive manufacturing Stainless steel 

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Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  • Jonas Lunde
    • 1
    Email author
  • Mostafa Kazemipour
    • 1
  • Salar Salahi
    • 1
  • Ali Nasiri
    • 1
  1. 1.Faculty of Engineering and Applied ScienceMemorial University of NewfoundlandSt. John’sCanada

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