Load sequence effects in the high cycle fatigue of two ferrite-pearlite microalloyed steels
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V. Subramanya Sarma
and
K. A. Padmanabhan
Abstract
The high cycle fatigue (HCF) behaviour and load sequence effects in HCF of two microalloyed steels are presented. Dislocation structures that resulted from HCF loading were examined. The fatigue limits of the two microalloyed (MA) steels (non-failure after 2×106 cycles) correlated well with the cyclic yield strength. The results of two-step loading showed that in both the steels after an initial life fraction of approximately 0.4, the residual life deviated significantly from that predicted by the Palmgren-Miner rule. Crack initiation lives of the MA steels had been determined from the two-step loading experiments. Fatigue functions, which can be used for life prediction under complex loading conditions using the consecutive Wöhler curve approach, were determined from the two-step loading tests. Dislocation cell structures were observed near the fracture surface in the HCF regime. At the fatigue limit, dislocation dipoles and loops were seen.
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This work was supported by Department of Science and Technology, Government of India and DLR, Cologne, Germany under an Indo-German collaborative research programme. Drs. J. J. Irani and O. N. Mohanty of Tata Iron and Steel Company, Jamshedpur, India, supplied the microalloyed steels. The authors thank the Alexander von Humboldt Foundation for financial support for a stay in Germany during which period this paper was finalized.
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© 2002 Carl Hanser Verlag, München
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- Notifications/Mitteilungen
- Personal/Personelles
Articles in the same Issue
- Frontmatter
- Articles/Aufsätze
- Strain rate dependence of the deformation mechanisms in a fully lamellar γ-TiAl-based alloy
- Experimental and thermodynamic assessment of the Fe –Gd–Zr system
- Phase diagram of the Fe –Co –Ti system at 1073 K
- Copper concentration inside Guinier-Preston I zones formed in an Al –Cu alloy
- Identification of precipitates in 6013 aluminum alloy (Al –Mg –Si –Cu)
- Redistribution of phosphorus and carbon in steel weldments
- Microstructure and compressive properties of in situ synthesized TiC/Ti composites
- Effect of Al on the glass forming ability of Zr–Ni –Cu–Al alloys
- Fcc-hcp transformation-related internal friction in Fe –Mn alloys
- High-temperature stress and strain partitioning in duplex stainless steel
- Load sequence effects in the high cycle fatigue of two ferrite-pearlite microalloyed steels
- Characterization of intermetallic compounds formed during the interfacial reactions of liquid Sn and Sn– 58Bi solders with Ni substrates
- Notifications/Mitteilungen
- Personal/Personelles
