Abstract
It has been well known that the flaking failure in rolling contact fatigue (RCF) originates from nonmetallic inclusions in steels, and their apparent size is one of the important factors affecting RCF life. However, the influence of inclusion shape on the RCF life has not been fully clarified. In this study, attention was paid to the influence of the inclusion shape on the RCF life. This was evaluated by using carburized JIS-SCM420 (SAE4320) steels that contained two different shapes of MnS—stringer type and spheroidized type—as inclusions. Sectional observations were made to investigate the relation between the occurrence of shear crack in the subsurface and the shape of MnS. It was found that the RCF life was well correlated with the length of MnS projected to the load axis, and the initiation of shear crack in subsurface was accelerated as the length of MnS increased.
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Neishi, Y., Makino, T., Matsui, N. et al. Influence of the Inclusion Shape on the Rolling Contact Fatigue Life of Carburized Steels. Metall Mater Trans A 44, 2131–2140 (2013). https://doi.org/10.1007/s11661-012-1344-9
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DOI: https://doi.org/10.1007/s11661-012-1344-9