The role of primary carbides in fatigue crack propagation in aeroengine bearing steels

A. Iqbal*, J.E. King

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    Fatigue crack propagation, tensile and fracture toughness data for four aeroengine bearing steels are reported. The steels involved are the through-hardened tool steels 18-4-1 (T1) and M50, and two similar carburized steels, RBD and Volvic. Crack growth data have been obtained at 20 °C and 280 °C to cover the range of oil temperatures experienced in aeroengine bearing operations. At 20 °C threshold ΔK values (ΔKth) ranged between 3.5 and 4.5 MPa √m with Paris exponents (m) of between 2.0 and 3.5. The lowest m-values were seen in the carburizing steels, which also exhibited lower Paris regime crack growth rates than M50 and 18-4-1. For all the steels, growth rates were higher at 280 °C,than 20 °C, although there was a slight tendency for ΔKth to increase, probably associated with oxide-induced closure at 280 °C. The effects of primary carbides, strength and toughness on fatigue crack growth behaviour are discussed, in relation to the importance of static-mode cracking. © 1990.

    Original languageEnglish
    Pages (from-to)234-244
    Number of pages11
    JournalInternational Journal of Fatigue
    Issue number4
    Publication statusPublished - Jul 1990


    • aeroengine bearing steels
    • fatigue crack propagation
    • primary carbides


    Dive into the research topics of 'The role of primary carbides in fatigue crack propagation in aeroengine bearing steels'. Together they form a unique fingerprint.

    Cite this