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<p>The carbon steel (CS) parts produced by wire arc additive manufacturing (WAAM) have great advantages as the core component of composite metal materials. However, the large heat input in the process of additive manufacturing will lead to the formation of columnar crystals and dendrites with growth tendency in the material, so that the additive parts show anisotropy and limit their performance. In this study, hot wire arc additive manufacturing (HWAAM) is adopted, and resistance heating welding wire is used to reduce the heat input of arc to the substrate. The influence of WAAM on the microstructure and mechanical properties of CS parts is studied and compared with the common cold-rolled (CR) and hot-rolled (HR) carbon steel in industry. The results show that due to the influence of the reheat of the subsequent cladding layer, the previous cladding layer is dominated by equiaxed ferrite grains. Due to the influence of the hot wire current, the tensile properties and impact toughness of the additive parts with different orientations are similar, showing isotropic mechanical properties, and the performance is better than that of the rolled carbon steel.</p>

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Hot Wire Assisted Arc Additive Manufacturing of Carbon Steel Parts: Study on Microstructure and Mechanical Properties

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Li Yitong,
  • Yin Ziqiang,
  • Sun Xiuhuai,
  • Wang Shouren

摘要

The carbon steel (CS) parts produced by wire arc additive manufacturing (WAAM) have great advantages as the core component of composite metal materials. However, the large heat input in the process of additive manufacturing will lead to the formation of columnar crystals and dendrites with growth tendency in the material, so that the additive parts show anisotropy and limit their performance. In this study, hot wire arc additive manufacturing (HWAAM) is adopted, and resistance heating welding wire is used to reduce the heat input of arc to the substrate. The influence of WAAM on the microstructure and mechanical properties of CS parts is studied and compared with the common cold-rolled (CR) and hot-rolled (HR) carbon steel in industry. The results show that due to the influence of the reheat of the subsequent cladding layer, the previous cladding layer is dominated by equiaxed ferrite grains. Due to the influence of the hot wire current, the tensile properties and impact toughness of the additive parts with different orientations are similar, showing isotropic mechanical properties, and the performance is better than that of the rolled carbon steel.