On fatigue behavior of two spring steels. Part I: Wöhler curves and fractured surfaces

Symmetric fatigue in two spring steels is investigated in three groups of specimens. One of the groups (Steel EN10270-1SH/ DIN 17223C – C 0.82%, Mn 0.76%, Si 0.26%) has experienced rotating-bending fatigue in air, and the other two groups (Steel BS250A53/ DIN 55Si7 – C 0.56%, Mn 0.81%, Si 1.85%), to...

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Bibliographic Details
Published inFrattura ed integritá strutturale Vol. 10; no. 37; pp. 249 - 257
Main Authors Angelova, D, Yordanova, R, Lazarova, T, Yankova, S
Format Journal Article
LanguageEnglish
Published Cassino Gruppo Italiano Frattura 01.07.2016
Subjects
Analysis
Crack propagation
Fatigue (materials)
Fatigue failure
Fatigue- Crack Path
Fracture mechanics
Metal fatigue
Replication
Rotating-Bending Fatigue
Short-Fatigue-Crack Growth
Spring steels
Steel
Steels
Torsion
Torsion Fatigue
Wöhler curve
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Summary:Symmetric fatigue in two spring steels is investigated in three groups of specimens. One of the groups (Steel EN10270-1SH/ DIN 17223C – C 0.82%, Mn 0.76%, Si 0.26%) has experienced rotating-bending fatigue in air, and the other two groups (Steel BS250A53/ DIN 55Si7 – C 0.56%, Mn 0.81%, Si 1.85%), torsion fatigue in-air and corrosion environment. Fatigue life-time data are obtained for both spring steels, and their corresponding Wöhler curves plotted and mathematically described. Surface short fatigue cracks are observed from origin to fracture by using acetate-foil replication technique, and their length, a, measured at the corresponding number of fatigue cycles, N. Those data are presented in plots “Crack lengths, a – Cycles, N” and a comparison made between both the steels. The fractured surfaces of all specimens have been studied and analyzed by the scanning-electron microscopy methods
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ISSN:1971-8993
1971-8993
DOI:10.3221/IGF-ESIS.37.33