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Microstructural mechanisms of fatigue crack non-propagation in TRIP-maraging steels

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Wang,  Meimei
Adaptive Structural Materials (Experiment), Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA;

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Citation

Zhang, Z., Koyama, M., Wang, M., Tsuzaki, K., Tasan, C. C., & Noguchi, H. (2018). Microstructural mechanisms of fatigue crack non-propagation in TRIP-maraging steels. International Journal of Fatigue, 113, 126-136. doi:10.1016/j.ijfatigue.2018.04.013.


Cite as: http://hdl.handle.net/21.11116/0000-0001-E628-F
Abstract
In contrast to conventional martensitic steels, transformation-induced plasticity (TRIP)-maraging steels exhibit exceptional high ductility without sacrificing strength and excellent fatigue property owing to the retained austenite/maraging martensite laminated structure. In this study, TRIP-maraging steel (Fe-9Mn-3Ni-1.4Al-0.01C, wt.) with fine grained austenite was used to investigate the mechanism of high cycle fatigue resistance. Our analyses revealed that soft austenite region acts as a preferential crack propagation path, but the plastic deformation during crack opening involves martensitic transformation, resisting subsequent crack growth via transformation-induced local hardening or crack closure. Moreover, crack growth along the laminates and across the block boundary forms a zigzag crack path, which would act as roughness-induced crack closure. The combined effect of these factors plays an important role in resisting fatigue crack growth at high cycle fatigue. © 2018 Elsevier Ltd