Influence of ferrite fraction within martensite matrix on fatigue crack propagation: An experimental verification with dual phase steel

[Display omitted] ► Influence of a ferrite fraction in a martensite matrix on fatigue crack propagation is studied. ► Variation of the areal fraction is achieved by means of intercritical thermal treatment. ► The highest fatigue strength was achieved when the ferrite areal fraction was 65%. The infl...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2012-08, Vol.552, p.547-554
Main Authors: Idris, Roslinda, Prawoto, Yunan
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Crack propagation
Exact sciences and technology
Fatigue
Fatigue (materials)
Fatigue failure
Fatigue, brittleness, fracture, and cracks
Ferrite
Ferrous alloy
Finite element method
Fracture
Fractures
Martensite
Mechanical and acoustical properties of condensed matter
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanical properties of solids
Metals. Metallurgy
Microstructure
Optimization
Physics
steel
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Summary:[Display omitted] ► Influence of a ferrite fraction in a martensite matrix on fatigue crack propagation is studied. ► Variation of the areal fraction is achieved by means of intercritical thermal treatment. ► The highest fatigue strength was achieved when the ferrite areal fraction was 65%. The influence of a ferrite areal fraction within a martensite matrix on fatigue crack propagation is studied experimentally. The variation of the areal fraction is achieved by means of intercritical thermal treatment, which specifically aims at optimizing the resistance to fatigue loading. Within the intercritical annealing temperature range, the areal fraction of ferrite increases with decreasing soaking temperature. Furthermore, the experiment also reveals that the highest fatigue strength was achieved when the ferrite areal fraction was approximately 65%, which in this particular test, corresponds to 748°C. It is concluded that appropriate thermal treatment can contribute to a significant improvement of fatigue properties and strength, which was also verified by computational modeling.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2012.05.085