Microstructural refinement and enhanced mechanical properties of wire-arc additively manufactured Inconel 625 via a bottom cooling substrate system

This study investigated the microstructure evolution and performance characteristics of additive manufacturing Inconel 625 material via a bottom cooling substrate system. Compared with natural cooling, bottom cooling increased the average cooling rate from 5.15 °C/s to 7.87 °C/s. This significant rate increment directly regulated the molten pool's solidification process. The results show that bottom cooling increased the cooling rate by approximately 50 %, accelerating solidification. This acceleration refined MC carbides into finer, uniformly distributed particles and reduced Laves phase size. Additionally, bottom cooling decreased the average grain size from 192.17 μm to 184.74 μm and significantly lowered…

• BU
  Beijing University of Technology

  Award: 4244064
• NS
  Natural Science Foundation of Beijing Municipality
• SR
  Scientific Research Fund of Liaoning Provincial Education Department