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

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)126-136
Number of pages11
JournalInternational Journal of Fatigue
Volume113
DOIs
Publication statusPublished - Aug 2018

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All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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