NDLI: Gas Mixture and Current Density Variation and Their Effect on White-Layer Properties of Nitrided Steel

Content Provider	Springer Nature Link
Author	Granda Gutiérrez, E. E. Díaz Guillén, J. C. Pérez Aguilar, S. I. Campa Castilla, A. Garza Gómez, A. Candelas Ramírez, J.
Copyright Year	2012
Abstract	The effect of current density and gas mixture on surface properties of low alloy steel processed in a pulsed plasma nitriding system under strictly controlled conditions is evaluated in this work. As current density is a parameter that has not been particularly studied, this study seeks to demonstrate that current density and gas mixture have an important influence on the process and an adequate combination of these two variables is essential to obtain the desired surface properties: hardness, white layer thickness (or absence), and crystalline phases of the modified layer. In this sense, samples processed at low current densities with low nitrogen content in the plasma atmosphere show a diffusive nitrides region which increases the hardness from 250 HV (untreated reference sample) to 400 HV without the presence of the typical white layer that is sometimes undesired due to its fragility and tendency to break. On the other hand, treatment at high current densities and high nitrogen concentrations leads to obtain pieces with a homogeneous single-phase layer (γ-Fe$_{4}$N) with an outstanding corrosion performance, diminishing the corrosion rate from 0.160 μm per year in the untreated sample up to 0.050 μm per year.
Starting Page	2080
Ending Page	2084
Page Count	5
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	21
Issue Number	10
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2012-01-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	corrosion hardness plasma nitriding surface treatment Engineering Design Characterization and Evaluation of Materials Quality Control, Reliability, Safety and Risk Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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