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International Journal of Fatigue | Vol.100, Issue.1 | | Pages

Effects of lamella size and connectivity on fatigue crack resistance of TRIP-maraging steel

Z. Zhang H. Noguchi M. Koyama M.M. Wang K. Tsuzaki C.C. Tasan

Abstract

The effect of austenitization time on the fatigue crack resistance of transformation-induced plasticity (TRIP)-maraging steel was investigated by observing the crack initiation site, propagation path and fracture surface. Our analyses show that austenitization for a longer time increases austenite/martensite lamella size and connectivity of austenite. Simultaneously, increasing lamella size leads to a reduction in austenite hardness; higher austenite connectivity accelerates crack propagation. In addition, remarkable roughness on the crack surface associated with the laminated structure was observed in both steels, which caused roughness-induced crack closure.

Original Text (This is the original text for your reference.)

Effects of lamella size and connectivity on fatigue crack resistance of TRIP-maraging steel

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Keywords

laminated structure austenite connectivity fracture surface lamella size plasticity tripmaraging austenitization time fatigue crack resistance roughness crack initiation site propagation path

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Z. Zhang, H. Noguchi, M. Koyama, M.M. Wang, K. Tsuzaki, C.C. Tasan,.Effects of lamella size and connectivity on fatigue crack resistance of TRIP-maraging steel. 100 (1),.

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