Meimei Wang

TL;DR: It is shown here that when steel microstructures are hierarchical and laminated, similar to the substructure of bone, superior crack resistance can be realized and the exceptional properties enabled by this strategy provide guidance for all fatigue-resistant alloy design efforts.

TL;DR: In this paper, the authors studied the strain partitioning and damage behavior of these steels by carrying out in-situ high-resolution microstructure and micro-strain mapping experiments.

TL;DR: In this paper, 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.

TL;DR: In this article, a TRIP-maraging steel with fine grained austenite was used to investigate the mechanism of high cycle fatigue resistance, and it was shown that soft austenites region acts as a preferential crack propagation path, but the plastic deformation during crack opening involves martensitic transformation, resisting subsequent crack growth via transformationinduced local hardening or crack closure.

TL;DR: In this paper, the Mn micro-segregation governed the re-reversion process in a martensite-reverted-austenite steel, and the resulting microstructure exhibited the original mechanical response even after multiple reversions, demonstrating the governing role of mechanically induced martensitic transformation on strain hardening.