Journal of Materials Research and Technology (May 2024)

The influence of additive manufacturing on Portevin-Le Châtelier (PLC) effect in Ni–Co-based superalloy

  • Ling Tang,
  • Lei Xu,
  • Yang Li,
  • Jianping Tan,
  • Changyun Li,
  • Jinguo Li,
  • Jingjing Liang,
  • Chuanyong Cui,
  • Xiaofeng Sun

Journal volume & issue
Vol. 30
pp. 9318 – 9324

Abstract

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The microstructures and tensile properties of the Ni–Co-based superalloys made by additive manufacturing (AM) were investigated. The results revealed that both normal and inverse Portevin-Le Châtelier (PLC) effects were observed in AM Ni–Co-based superalloys. In addition, AM significantly inhibited the PLC effect, the average stress decrements for the cast and wrought (C&W) alloys with the same nominal compositions were more than ten times as large as those for the AM alloys when tested at 400 °C with a strain rate of 3 × 10−4 s−1. In the AM Ni–Co-based superalloys, type C serrations had connections with the inverse PLC effect. Transmission electron microscope (TEM) was performed to investigate the interactions of solute atoms, dislocations, stacking faults (SFs) and the γ′ phase for a deep insight into mechanisms of the PLC effects and clarifying the changes in serration types and the conversion from normal to inverse PLC effect.

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