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<p>This work investigates the microstructural evolution and mechanical properties of wire arc additive manufactured (WAAM) GH4169 alloy following solution treatment at 1065&#xa0;°C, an intermediate temperature between the onset and completion of Laves phase dissolution. Prolonged solution times transform the Laves phase from long-chain to blocky morphologies, accompanied by progressive dissolution. Besides, the δ-phase also undergoes evolution. Tensile testing reveals that the 1&#xa0;h solution-treated sample achieves optimal tensile strength and ductility at both room and elevated temperatures, correlating with larger, more uniform dimples on fracture surfaces. Transmission electron microscopy (TEM) further identifies high dislocation densities and dislocation walls within this sample. These microstructural features can enhance the mechanical performance, which establish a microstructure-property relationship specific to WAAM GH4169 and advance heat treatment strategies for additively manufactured superalloys.</p>

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Controlled Laves/δ/MC Phase Evolution in a Wire Arc Additive-Manufactured GH4169 Ni-Based Superalloy

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Chao Liu,
  • Ping Han,
  • Hongwei Sun,
  • Yun Zhao

摘要

This work investigates the microstructural evolution and mechanical properties of wire arc additive manufactured (WAAM) GH4169 alloy following solution treatment at 1065 °C, an intermediate temperature between the onset and completion of Laves phase dissolution. Prolonged solution times transform the Laves phase from long-chain to blocky morphologies, accompanied by progressive dissolution. Besides, the δ-phase also undergoes evolution. Tensile testing reveals that the 1 h solution-treated sample achieves optimal tensile strength and ductility at both room and elevated temperatures, correlating with larger, more uniform dimples on fracture surfaces. Transmission electron microscopy (TEM) further identifies high dislocation densities and dislocation walls within this sample. These microstructural features can enhance the mechanical performance, which establish a microstructure-property relationship specific to WAAM GH4169 and advance heat treatment strategies for additively manufactured superalloys.