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- Title
Microstructure of Plasma Nitrided AISI420 Martensitic Stainless Steel at 673 K.
- Authors
Aizawa, Tatsuhiko; Yoshino, Tomoaki; Morikawa, Kazuo; Yoshihara, Sho-Ichiro
- 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.
- Subjects
MARTENSITIC stainless steel; NITRIDING; MICROSTRUCTURE; LOW temperature plasmas; PLASTICS; PLASMA gases
- Publication
Crystals (2073-4352), 2019, Vol 9, Issue 2, p60
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst9020060