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Material properties and mechanical behaviour of functionally graded steel produced by wire-arc additive manufacturing
Additive Manufacturing ( IF 11.0 ) Pub Date : 2021-07-14 , DOI: 10.1016/j.addma.2021.102175
E. Tenuta 1 , A. Nycz 2 , M. Noakes 2 , S. Simunovic 3 , M.H.A. Piro 4
Affiliation  

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 analyzed by two-dimensional 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 dependant 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.



中文翻译:

线弧增材制造功能梯度钢的材料性能和力学行为

金属大面积增材制造是一种基于气体保护金属电弧焊 (GMAW) 的增材制造技术,可选择使用多种保护气体和材料。系统配备双炬管设计,可打印不同材料;在我们的研究中,AISI 410 不锈钢和 AWS ER70S-6 低碳钢都印刷在同一组件中。不同的打印策略旨在突出材料和机械性能的变化。通过位移控制试验中单轴拉伸试样的二维数字图像相关分析材料界面的变形行为。观察到与界面相邻的非均匀局部应变的实例,以及基于打印位置的机械行为和微观结构的可变性。光学和电子显微镜用于评估低碳钢和不锈钢之间 5 毫米范围内的三个显微结构区域。远离界面的区域产生多边形铁素体和珠光体,而靠近界面的区域产生针状铁素体和贝氏体。铬的再分布曲线取决于所使用的印刷策略,如具有能量色散光谱的扫描电子显微镜所示。通过电子背散射衍射产生的证据显示支持转变诱导塑性不是非均匀变形的原因的论点。而靠近界面的区域产生针状铁素体和贝氏体。铬的再分布曲线取决于所使用的印刷策略,如具有能量色散光谱的扫描电子显微镜所示。通过电子背散射衍射产生的证据显示支持转变引起的塑性不是非均匀变形的原因的论点。而靠近界面的区域产生针状铁素体和贝氏体。铬的再分布曲线取决于所使用的印刷策略,如具有能量色散光谱的扫描电子显微镜所示。通过电子背散射衍射产生的证据显示支持转变诱导塑性不是非均匀变形的原因的论点。

更新日期:2021-07-14
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