Effect of Hydrogen Addition on the Characteristics of Nitrided Martensitic Stainless Steel AISI 420

Abstract:

High density RF-DC plasma nitriding was carried out to harden the surface of martensitic stainless steels AISI-420. The nitriding temperature is hold at 673 K (or 400°C). Nitrogen (N₂) and mixture of nitrogen (N₂)-hydrogen (H₂) was utilized as a plasma atmosphere. Vickers micro-hardness testing was utilized to examine the change of surface hardness and the corresponding microstructure analysis was carried out by utilizing X-Ray Diffraction (XRD) analysis. Nitrogen concentration and diffusion length were characterized by using Auger Electron Spectroscopy (AES). Hydrogen addition to nitrogen plasma resulted significant increase of hardness, nitrogen concentration and diffusion length compared to pure nitrogen plasma. The significant peak shift observed in XRD pattern of specimen nitrided with N₂+H₂ plasma indicates new phase formation or phase transformation. Those phenomena related to hydrogen role in nitriding process.

• Periodical: Applied Mechanics and Materials (Volume 836)
• Pages: 214-218
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.836.214
• Online since: June 2016
• Authors: Istiroyah Istiroyah, I.N.G. Wardana, D.J. Santjojo
• Keywords: High Dense Plasma, Hydrogen Role, Phase Transformation, Solid Solution Hardening

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