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Author Lee, Insup
Source SpringerLink
Content type Text
Publisher The Korean Institute of Metals and Materials
File Format PDF
Copyright Year ©2017
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations
Subject Keyword plasma nitrocarburizing ♦ AISI 630 stainless steel ♦ expanded martensite layer ♦ corrosion resistance ♦ discharge voltage ♦ Metallic Materials ♦ Operating Procedures, Materials Treatment ♦ Magnetism, Magnetic Materials ♦ Engineering Thermodynamics, Heat and Mass Transfer ♦ Characterization and Evaluation of Materials ♦ Continuum Mechanics and Mechanics of Materials
Abstract Plasma nitrocarburizing was performed on solution-treated AISI 630 martensitic precipitation hardening stainless steel samples with a gas mixture of H$_{2}$, N$_{2}$, and CH$_{4}$ with changing temperature, discharge voltage and amount of CH$_{4}$. When nitrocarburized with increasing temperature from 380 °C to 430 °C at fixed 25% N$_{2}$ and 6% CH$_{4}$, the thickness of expanded martensite (α'$_{N}$) layer and surface hardness increased up to 10 μm and 1323 HV$_{0.05}$, respectively but the corrosion resistance decreased. Though the increase of discharge voltage from 400 V to 600 V increased α'$_{N}$ layer thickness and surface hardness (up to 13 μm and 1491 HV$_{0.05}$, respectively), the treated samples still showed very poor corrosion behavior. Thus, to further improve the corrosion resistance, the influence of variation of the amount of CH$_{4}$ in the nitrocarburizing process was investigated. Increasing the CH$_{4}$ percentage aided higher corrosion resistance, although it decreased the α'$_{N}$ layer thickness. The most appropriate conditions for moderate α'$_{N}$ layer thickness, high surface hardness and better corrosion resistance than the solution-treated bare sample were established, which is plasma nitrocarburizing at 400 °C with 400 V discharge voltage and containing 25% N$_{2}$ and 4% CH$_{4}$.
ISSN 15989623
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2017-11-14
Publisher Place Seoul
e-ISSN 20054149
Journal Metals and Materials
Volume Number 23
Issue Number 6
Page Count 9
Starting Page 1112
Ending Page 1120

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Source: SpringerLink