Fatigue of Microalloyed Bar Steels

Paper #:
  • 2000-01-0615

Published:
  • 2000-03-06
Citation:
Johnson, J., Krauss, G., and Matlock, D., "Fatigue of Microalloyed Bar Steels," SAE Technical Paper 2000-01-0615, 2000, https://doi.org/10.4271/2000-01-0615.
Pages:
11
Abstract:
The fatigue behavior of five microalloyed steels, processed with hardnesses between 25-28 HRC containing microstructures ranging from precipitation-hardened ferrite-pearlite to bainite, were evaluated in both low cycle (strain controlled) and high cycle (stress controlled fatigue. The vanadium-bearing steels included, 15R30V, 1522 MoVTi, 1522 MoVTiS, 1534 MoVTi, and 1534 MoVTiSi. Conventional quench and tempered 4140 steel was used as a reference.Low cycle fatigue (LCF) data for all steels were similar. Subtle microstructural-dependent differences in the high-strain amplitude region of the LCF curves were attributed to the effects of retained austenite, present in some of the non-traditional bainitic steels. In high cycle fatigue, all steels exhibited similar properties, except for the ferrite-pearlite steel (15R30V) which exhibited the lowest endurance limit, an observation which was attributed to crack nucleation in coarse-grained ferrite.
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