Microstructure and tensile fracture behavior of three-stage heat treated inconel 718 alloy produced via laser powder bed fusion process

Jun Ren Zhao, Fei Yi Hung, Truan Sheng Lui

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

In this study, Laser Powder Bed Fusion (LPBF) Inconel 718 is subjected to various heattreatments, namely double aging, solid solution + double aging, and homogenization +solid-solution + double aging, to investigate the effect of heat treatment on room- and high-temperature tensile properties. The results show that all three heat treatments increasehardness and room-temperature tensile strength, but greatly reduce ductility. With anincrease in tensile test temperature, the stress-induced Portevin-Le Chatelier (PLC) effectcan effectively prevent the occurrence of oxidation at grain boundaries and maintain a cer-tain ductility in the range of room temperature to 600°C. However, when the temperatureis 650°C, the PLC effect disappears, resulting in a high-temperature embrittlement effect.

Original languageEnglish
Pages (from-to)3357-3367
Number of pages11
JournalJournal of Materials Research and Technology
Volume9
Issue number3
DOIs
Publication statusPublished - 2020

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Biomaterials
  • Surfaces, Coatings and Films
  • Metals and Alloys

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