In situ interlayer hot forging arc plasma directed energy deposition of Inconel® 625: microstructure evolution during heat treatments

Francisco Werley Cipriano Farias, Valdemar R. Duarte, Igor Oliveira Felice, João da Cruz Payão Filho, Norbert Schell, Emad Maawad, J. Y. Li, Y. Zhang, T. G. Santos, J. P. Oliveira

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
9 Downloads (Pure)

Abstract

The study reports that the combined use of in situ interlayer hot forging and post-deposition heat treatment (PDHT) could alter the typical coarse and oriented microstructure of the Ni-based superalloy 625 obtained by arc plasma directed energy deposition (DED) to a fine and non-oriented condition. In situ synchrotron X-ray diffraction and electron backscatter diffraction showed that the high-temperature (1100 °C/ 1 h) PDHT induced significant recrystallization, leading to grain refinement and low texture index, while partially dissolving deleterious Laves and δ phases. Low-temperature (980 °C/ 1 h) PDHT had a limited effect on the grain size refinement and induced the formation of secondary phases. It is shown that conventional heat treatments applied to Ni-based superalloy 625 obtained by arc plasma DED are not conducive to optimized microstructure features. In situ hot forging induced enough crystal defects to promote static recrystallization during PDHT. Besides, high-temperature PDHT met the AMS 5662 grain size requirements.

Original languageEnglish
Article number170059
Number of pages14
JournalJournal of Alloys and Compounds
Volume952
DOIs
Publication statusPublished - 15 Aug 2023

Keywords

  • Directed energy deposition
  • Inconel 625
  • Ni-based superalloys
  • Synchrotron X-ray diffraction
  • Wire and arc additive manufacturing

Fingerprint

Dive into the research topics of 'In situ interlayer hot forging arc plasma directed energy deposition of Inconel® 625: microstructure evolution during heat treatments'. Together they form a unique fingerprint.

Cite this