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Crystals 2019, 9(2), 60; https://doi.org/10.3390/cryst9020060

Microstructure of Plasma Nitrided AISI420 Martensitic Stainless Steel at 673 K

1
Surface Engineering Design Laboratory, Shibaura Institute of Technology, Tokyo 144-0045, Japan
2
Komatsu Seiki Kosakusho, Co., Ltd., 392-0012 Suwa, Japan
3
Tokyo Metropolitan Industry Research Institute, Tokyo 144-0045, Japan
4
Department of Engineering and Design, Shibaura Institute of Technology, Tokyo 108-8548, Japan
*
Author to whom correspondence should be addressed.
Received: 3 December 2018 / Revised: 22 January 2019 / Accepted: 22 January 2019 / Published: 24 January 2019
(This article belongs to the Special Issue Microstructures and Properties of Martensitic Materials)
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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. View Full-Text
Keywords: low temperature plasma nitriding; martensitic stainless steels; nitrogen supersaturation; fine two-phase structuring; nanolamination in α’-grains low temperature plasma nitriding; martensitic stainless steels; nitrogen supersaturation; fine two-phase structuring; nanolamination in α’-grains
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Aizawa, T.; Yoshino, T.; Morikawa, K.; Yoshihara, S.-I. Microstructure of Plasma Nitrided AISI420 Martensitic Stainless Steel at 673 K. Crystals 2019, 9, 60.

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