Landolt-Börnstein - Group VIII Advanced Materials and Technologies

Iron and steel: Fatigue strength

Abstract

This chapter discusses on fatigue strength of unalloyed iron and alloyed steel for structural mass production parts. Fatigue strength cannot be expressed as a single valued material characteristic because it depends on many independent different and sometimes interacting parameters. Definition of stress ratio R in fatigue testing is illustrated. Effect of density on endurance limit of unalloyed iron and alloyed steel in as-sintered condition is also illustrated. Stress concentrations are usually characterized by a stress concentration factor Kt which is the ratio of the highest elastic peak stress in a notch and the nominal stress in the cross-section of the peak stress. Effect of external notches on the reduction of fatigue strength in as-sintered condition and after quenching and tempering is illustrated. The increase of flat bending endurance limits after case hardening for notched and smooth specimens with and without mean stress is shown. Effect of peak endurable stress in the unhardened condition on increase of endurance limit by quenching and tempering is also discussed. Relationship between fully reversed and pulsating stress amplitude for ductile material conditions and after heat treatment is illustrated. Haigh diagram for alloyed steel is also shown. Ratio between axial and bending fatigue amplitude in the as-sintered condition and after quenching and tempering is also illustrated. Combined effect of pore morphology and density on plane bending endurance limit of carbon-free iron and steel is illustrated. Rolling contact fatigue endurance limits is also shown.

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Title
Iron and steel: Fatigue strength
Book Title
Powder Metallurgy Data
In
5 Structural mass production parts
Book DOI
10.1007/b88278
Chapter DOI
10.1007/10689123_21
Part of
Landolt-Börnstein - Group VIII Advanced Materials and Technologies
Volume
2A1
Editors
  • P. Beiss Send Email (11)
  • R. Ruthardt Send Email (12)
  • H. Warlimont Send Email (13)
  • Editor Affiliation
  • 11 Professur und Institut für Werkstoffkunde, Rheinisch Westfälische Technische Hochschule (RWTH) Aachen, 52062, Aachen, Germany
  • 12 Aussenstelle Hanau, Deutsche Gesellschaft für Materialkunde e.V., Adalbert-Stifter-Str. 19, 63452, Hanau, Germany
  • 13 Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, 01069, Dresden, Germany
  • Authors
  • P. Beiss Send Email (101)
  • Author Affiliation
  • 101 Professur und Institut für Werkstoffkunde, Rheinisch Westfälische Technische Hochschule (RWTH) Aachen, 52062, Aachen, Germany
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