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<p>The influence of variation in the metal-3D printing techniques on microstructural evolution, mechanical properties, wear response, and electrochemical corrosion behavior of IN718 is intended to be investigated. In the present work, IN718 parts are fabricated by two distinct 3D printing techniques such as Wire Arc Additive Manufacturing (WAAM) and Laser-Powder Bed Fusion (L-PBF). In the <i>as-printed</i> state, microstructural characterization followed by studies on the mechanical, tribological, and electrochemical properties is carried out. The <i>as-printed</i> WAAMed and L-PBFed IN718 specimens are subjected to a common heat treatment schedule which includes a homogenization treatment (1186&#xa0;°C/40&#xa0;min + air cool) followed by the aging treatments. The first-stage aging is performed at 720&#xa0;°C/8&#xa0;h + furnace cool. The second-stage aging is carried out at 650&#xa0;°C/8&#xa0;h + air cool. The microstructure and material properties of the <i>as-printed</i> IN718 are compared to that of the post-heat-treated counterparts. Tribological properties are studied by carrying out the dry sliding wear tests (<i>ball-on-disk</i> configuration), while potentiodynamic polarization tests are performed to study the electrochemical corrosion behavior. When compared with the <i>as-printed</i> state, improved mechanical properties are obtained due to precipitation strengthening of the alloy, taking place during the aging treatments. The post-heat-treated WAAMed IN718 has ~ 31% higher tensile strength than the <i>as-printed</i> counterpart. In the <i>as-printed</i> condition, the fine dendritic/cellular solidification microstructure of the L-PBFed IN718 causes ~ 41% higher microhardness value than the WAAMed counterpart. The post-heat treatment causes ~ 94% and ~ 48% increased microhardness value for the WAAMed and L-PBFed IN718, respectively, when compared with their <i>as-printed</i> counterparts. The post-heat treatment improves the dry sliding wear resistance for both the WAAMed and L-PBFed IN718 specimens. The <i>as-printed</i> L-PBFed IN718 exhibits better corrosion resistance than the <i>as-printed</i> WAAMed counterpart.</p>

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Comparative Study of WAAM and L-PBF-Fabricated IN718: Effect of Post-Print Thermal Treatment

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Raj Kumar Bisoyi,
  • Sameer Anand,
  • Nimai Haldar,
  • Saurav Datta,
  • Tarapada Roy

摘要

The influence of variation in the metal-3D printing techniques on microstructural evolution, mechanical properties, wear response, and electrochemical corrosion behavior of IN718 is intended to be investigated. In the present work, IN718 parts are fabricated by two distinct 3D printing techniques such as Wire Arc Additive Manufacturing (WAAM) and Laser-Powder Bed Fusion (L-PBF). In the as-printed state, microstructural characterization followed by studies on the mechanical, tribological, and electrochemical properties is carried out. The as-printed WAAMed and L-PBFed IN718 specimens are subjected to a common heat treatment schedule which includes a homogenization treatment (1186 °C/40 min + air cool) followed by the aging treatments. The first-stage aging is performed at 720 °C/8 h + furnace cool. The second-stage aging is carried out at 650 °C/8 h + air cool. The microstructure and material properties of the as-printed IN718 are compared to that of the post-heat-treated counterparts. Tribological properties are studied by carrying out the dry sliding wear tests (ball-on-disk configuration), while potentiodynamic polarization tests are performed to study the electrochemical corrosion behavior. When compared with the as-printed state, improved mechanical properties are obtained due to precipitation strengthening of the alloy, taking place during the aging treatments. The post-heat-treated WAAMed IN718 has ~ 31% higher tensile strength than the as-printed counterpart. In the as-printed condition, the fine dendritic/cellular solidification microstructure of the L-PBFed IN718 causes ~ 41% higher microhardness value than the WAAMed counterpart. The post-heat treatment causes ~ 94% and ~ 48% increased microhardness value for the WAAMed and L-PBFed IN718, respectively, when compared with their as-printed counterparts. The post-heat treatment improves the dry sliding wear resistance for both the WAAMed and L-PBFed IN718 specimens. The as-printed L-PBFed IN718 exhibits better corrosion resistance than the as-printed WAAMed counterpart.