Notch Fatigue Properties of TRIP-Aided Annealed Martensitic Steels

Nobuo Yoshikawa; Daiki Fuji; Kohichi Sugimoto

doi:10.4028/www.scientific.net/AMR.146-147.437

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Notch Fatigue Properties of TRIP-Aided Annealed Martensitic Steels
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Notch Fatigue Properties of TRIP-Aided Annealed Martensitic Steels

Abstract:

Fatigue properties of TRIP-aided annealed martensitic steels with chemical composition of 0.2%C, 1.5%Si, 1.5%Mn, 0-1.0%Cr, 0-0.2%Mo, 0-0.05%Nb, 0-18ppmB was examined for application of automotive diesel engine common rail. The steels achieved extremely higher notch fatigue limits and lower notch-sensitivity than the conventional structural steels, especially in steel with boron or without chromium and molybdenum. This was associated with (i) the TRIP effect of a large amount of stable retained austenite and (ii) strain-induced transformed hard martensite which suppressed the crack initiation and growth due to plastic relaxation.