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<p>This study investigates the repair of ATI 718Plus alloy using cold metal transfer wire arc additive manufacturing (CMT WAAM), with a focus on the microstructural evolution across different zones and its correlation with mechanical properties. The additive repair zone(ARZ) exhibits a non-equilibrium solidification microstructure, characterized by inclined columnar grains and brittle Laves phase precipitated in interdendritic regions. In contrast, the substrate zone(SZ) consists of equiaxed grains with uniform γ' precipitates, while the interfacial bonding zone shows a graded microstructure. Microhardness distribution is highly heterogeneous, governed by the respective presence, dissolution, or hardening effects of the γ' and Laves phases. Optimization of the process parameters effectively suppressed defects such as gas porosity and lack of fusion, yielding a dense and uniform as-deposited microstructure. Tensile tests reveal ductile fracture within the ARZ, where strain localization is attributed to insufficient precipitation strengthening and coarse columnar grains. Compared with laser-based and conventional arc-based repair processes reported in the literature, CMT WAAM exhibits a favorable strength-ductility balance in the as-deposited condition, primarily due to its reduced Laves phase formation. By establishing the process-microstructure-property relationships in CMT-repaired 718Plus alloy, this work provides a foundation for optimizing repair strategies for critical components, including future efforts toward microstructural homogeneity control.</p>

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Investigation on microstructure and mechanical properties of ATI 718Plus superalloy repaired by CMT wire arc additive manufacturing

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Jiajian Wang,
  • Zhipeng Zhang,
  • Jide Liu,
  • Chongwei Zhu,
  • Jiaqi Lv,
  • Jinguo Li

摘要

This study investigates the repair of ATI 718Plus alloy using cold metal transfer wire arc additive manufacturing (CMT WAAM), with a focus on the microstructural evolution across different zones and its correlation with mechanical properties. The additive repair zone(ARZ) exhibits a non-equilibrium solidification microstructure, characterized by inclined columnar grains and brittle Laves phase precipitated in interdendritic regions. In contrast, the substrate zone(SZ) consists of equiaxed grains with uniform γ' precipitates, while the interfacial bonding zone shows a graded microstructure. Microhardness distribution is highly heterogeneous, governed by the respective presence, dissolution, or hardening effects of the γ' and Laves phases. Optimization of the process parameters effectively suppressed defects such as gas porosity and lack of fusion, yielding a dense and uniform as-deposited microstructure. Tensile tests reveal ductile fracture within the ARZ, where strain localization is attributed to insufficient precipitation strengthening and coarse columnar grains. Compared with laser-based and conventional arc-based repair processes reported in the literature, CMT WAAM exhibits a favorable strength-ductility balance in the as-deposited condition, primarily due to its reduced Laves phase formation. By establishing the process-microstructure-property relationships in CMT-repaired 718Plus alloy, this work provides a foundation for optimizing repair strategies for critical components, including future efforts toward microstructural homogeneity control.