Material properties and mechanical behaviour of functionally graded steel produced by wire-arc additive manufacturing

被引:6
作者
Tenuta, E. [1 ]
Nycz, A. [2 ]
Noakes, M. [2 ]
Simunovic, S. [3 ]
Piro, M. H. A. [4 ]
机构
[1] Ontario Tech Univ, Fac Sci, Oshawa, ON, Canada
[2] Oak Ridge Natl Lab, Mfg Sci Div, Oak Ridge, TN USA
[3] Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN USA
[4] Ontario Tech Univ, Fac Energy Syst & Nucl Sci, Oshawa, ON, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Additive manufacturing; Interface; Microscopy; Microstructure; Stainless steel; Mild steel; Print strategy; MICROSTRUCTURE; MODEL; STRENGTH;
D O I
10.1016/j.addma.2021.102175
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Metal Big Area Additive Manufacturing is an additive manufacturing technique based on Gas Metal Arc Welding (GMAW) with the option to use many shielding gases, and materials. The system is equipped with a dual torch design allowing for printing different materials; in our study, AISI 410 stainless steel and AWS ER70S-6 mild steel are both printed in the same component. Different print strategies were designed to highlight changes in material and mechanical properties. Deformation behaviour of a materials' interface was analysed by twodimensional digital image correlation of uniaxial tensile specimens in displacement-controlled tests. Instances of non-homogeneous local strains adjacent to the interface are observed, as well as variability in mechanical behaviour and microstructure based on location within the print. Optical and electron microscopy are used to evaluate three microstructural zones in a 5 mm range of the interface between mild steel and stainless steel. Areas far from the interface produced polygonal ferrite and pearlite, while areas close to the interface produced acicular ferrite and bainite. Chromium redistribution profiles are dependent on the print strategy used, as shown by scanning electron microscopy with Energy dispersive spectroscopy. Evidence produced via electron backscatter diffraction is shown to support the argument that transformation induced plasticity is not the cause for the non-homogeneous deformation.
引用
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页数:17
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