Effects of molybdenum on precipitation behaviours in aged cast stainless steels

Takumi Hamaoka, Toyohiko J. Konno, Takashi Sawabe, Kenji Nishida, Kenji Dohi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The effects of Mo on precipitation behaviours in aged cast stainless steels have been investigated. Mo-free CF3 steel and Mo-bearing CF3M steel, both of which consisted of a duplex structure of ferrite and austenite phases, were prepared. Microstructural evolution in the ferrite phase during ageing at 723 K has been observed by transmission electron microscopy (TEM). Precipitates in CF3 steel were identified to belong to the G-phase and possess lattice coherency with the ferrite phase at interphase boundaries. On the other hand, precipitates in CF3M steel were found to be nanodomains of not only to the G-phase but also to another phase enriched in Mo. Some of the nanodomains containing Mo exhibited diffraction patterns having pseudo five-fold symmetry, but others exhibited regular periodicity in high-resolution TEM images. The atomic structure of the Mo-related nanodomains is proposed to be a distorted χ-phase that retains coherency with the matrix.

Original languageEnglish
Pages (from-to)2518-2536
Number of pages19
JournalPhilosophical Magazine
Volume96
Issue number24
DOIs
Publication statusPublished - 2016 Aug 22

Keywords

  • Duplex stainless steel
  • G-phase
  • ageing
  • precipitation
  • transmission electron microscopy
  • χ-phase

ASJC Scopus subject areas

  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Effects of molybdenum on precipitation behaviours in aged cast stainless steels'. Together they form a unique fingerprint.

Cite this