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

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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

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 languageEnglish
Pages (from-to)176-186
Number of pages11
JournalInternational Journal of Fatigue
Volume100
DOIs
Publication statusPublished - 2017 Jul 1
Externally publishedYes

Keywords

  • Crack closure
  • Crack growth rate
  • High cycle fatigue
  • Lamella
  • Transformation-induced plasticity-maraging steel

ASJC Scopus subject areas

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

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