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 journalArticle

    Abstract

    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
    Volume12
    Issue number4
    DOIs
    Publication statusPublished - Jul 1990

    Fingerprint

    Bearings (structural)
    Fatigue Crack Propagation
    Aeroengine
    Steel
    Fatigue crack propagation
    Carbides
    Crack propagation
    Carburizing
    Tool steel
    Crack Growth Rate
    Fracture Toughness
    Fatigue Crack Growth
    Toughness
    Oxides
    Crack Growth
    Cracking
    Fracture toughness
    Oils
    Lowest
    Closure

    Keywords

    • aeroengine bearing steels
    • fatigue crack propagation
    • primary carbides

    Cite this

    @article{b9447093ec7a4ddeb69abad527f79bf1,
    title = "The role of primary carbides in fatigue crack propagation in aeroengine bearing steels",
    abstract = "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. {\circledC} 1990.",
    keywords = "aeroengine bearing steels, fatigue crack propagation, primary carbides",
    author = "A. Iqbal and J.E. King",
    year = "1990",
    month = "7",
    doi = "10.1016/0142-1123(90)90450-S",
    language = "English",
    volume = "12",
    pages = "234--244",
    journal = "International Journal of Fatigue",
    issn = "0142-1123",
    publisher = "Elsevier",
    number = "4",

    }

    The role of primary carbides in fatigue crack propagation in aeroengine bearing steels. / Iqbal, A.; King, J.E.

    In: International Journal of Fatigue, Vol. 12, No. 4, 07.1990, p. 234-244.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - The role of primary carbides in fatigue crack propagation in aeroengine bearing steels

    AU - Iqbal, A.

    AU - King, J.E.

    PY - 1990/7

    Y1 - 1990/7

    N2 - 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.

    AB - 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.

    KW - aeroengine bearing steels

    KW - fatigue crack propagation

    KW - primary carbides

    UR - http://www.scopus.com/inward/record.url?scp=0009173377&partnerID=8YFLogxK

    U2 - 10.1016/0142-1123(90)90450-S

    DO - 10.1016/0142-1123(90)90450-S

    M3 - Article

    VL - 12

    SP - 234

    EP - 244

    JO - International Journal of Fatigue

    JF - International Journal of Fatigue

    SN - 0142-1123

    IS - 4

    ER -