Microstructure of plasma nitrided AISI420 martensitic stainless steel at 673 K

Tatsuhiko Aizawa, Tomoaki Yoshino, Kazuo Morikawa, Shouichirou Yoshihara

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Martensitic stainless steel type AISI420 was plasma nitrided at 673 K for 3.6 ks to investigate the initial stage of the nitrogen supersaturation process without the formation of iron and chromium nitrides. SEM-EDX, electron back-scattering diffraction (EBSD), and TEM analyses were utilized to characterize the microstructure of the nitrided layer across the nitriding front end. The original coarse-grained, fully martensitic microstructure turned to be α’-γ two phase and fine-grained by high nitrogen concentration. Below this homogeneously nitrided layer, α’-grains were modified in geometry to be aligned along the plastic slip lines together with the α’ to γ-phase transformation at these highly strained zones. Most of these α’-grains in the two-phase microstructure had a nano-laminated structure with the width of 50 nm.

Original languageEnglish
Article number60
JournalCrystals
Volume9
Issue number2
DOIs
Publication statusPublished - 2019 Feb 1

Keywords

  • Fine two-phase structuring
  • Low temperature plasma nitriding
  • Martensitic stainless steels
  • Nanolamination in α’-grains
  • Nitrogen supersaturation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'Microstructure of plasma nitrided AISI420 martensitic stainless steel at 673 K'. Together they form a unique fingerprint.

  • Cite this