Effect of the ion nitriding surface hardening process on fatigue behavior of AISI 4340 steel

Ion nitriding is a glow discharge surface modification technique, which is primarily used to increase the fatigue strength, wear, corrosion resistance and surface hardness of steels. Because of the formation of high compressive residual stresses in the case region, increasing surface hardness and ca...

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Bibliographic Details
Published in:Materials characterization 2008-04, Vol.59 (4), p.351-358
Main Authors: Sirin, Sule Yildiz, Sirin, Kahraman, Kaluc, Erdinc
Format: Article
Language:English
Subjects:
AISI 4340 steel
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue
Fatigue strength
Hardening. Tempering
Heat treatment
Ion nitriding
Materials science
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Production techniques
Solidification
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Summary:Ion nitriding is a glow discharge surface modification technique, which is primarily used to increase the fatigue strength, wear, corrosion resistance and surface hardness of steels. Because of the formation of high compressive residual stresses in the case region, increasing surface hardness and case depth cause remarkable improvement in fatigue properties of steels. In this study, the ion nitrided properties of quenched and tempered AISI 4340 low alloy steel were investigated under different process parameters including time and temperature. It has been found that the ion nitriding surface treatment improves the fatigue strength and increases the fatigue limit depending on the case depth. Up to 91% improvement in fatigue strength of the steel has been attained by ion nitriding. It was determined that, the subsurface ‘fish eye’ type formation is the dominant fatigue crack initiation mechanism in ion nitrided AISI 4340 steel in high cycle region and its origin was nonmetallic inclusions.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2007.01.019