Microstructure of plasma nitrided AISI420 martensitic stainless steel at 673 K

Tatsuhiko Aizawa, Tomoaki Yoshino, Kazuo Morikawa, Shouichirou Yoshihara

Research output: Contribution to journalArticle

1 Citation (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

Fingerprint

martensitic stainless steels
Martensitic stainless steel
Plasmas
microstructure
Microstructure
Nitrogen
nitrogen
nitriding
Nitriding
Supersaturation
Chromium
supersaturation
Nitrides
nitrides
phase transformations
Energy dispersive spectroscopy
chromium
slip
plastics
Iron

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

Cite this

Microstructure of plasma nitrided AISI420 martensitic stainless steel at 673 K. / Aizawa, Tatsuhiko; Yoshino, Tomoaki; Morikawa, Kazuo; Yoshihara, Shouichirou.

In: Crystals, Vol. 9, No. 2, 60, 01.02.2019.

Research output: Contribution to journalArticle

Aizawa, Tatsuhiko ; Yoshino, Tomoaki ; Morikawa, Kazuo ; Yoshihara, Shouichirou. / Microstructure of plasma nitrided AISI420 martensitic stainless steel at 673 K. In: Crystals. 2019 ; Vol. 9, No. 2.
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