Micromechanical response of dual-hardening martensitic bearing steel before and after rolling contact fatigue

• Material decay in bearing steels under rolling contact fatigue (RCF) leads to fatigue initiation and failure. This study examines the local structure-property relationshipin decayed material through in-situ compression testing of micropillars prepared froma dual-hardening martensitic bearing steel (Hybrid 60) before and after RCF testing. Specific crystal orientations are tested, revealing differing plastic behavior in the virgin and decayed material. RCF-induced ferritic microbands create highly localized deformation, that alters the micromechanical response. Crystal plasticity simulations confirm these findings, highlighting increased critical resolved shear stress and reduced strain hardening in decayed micropillars.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

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