Dynamic mechanical and fracture properties of an infiltrated TiC-1080 steel cermet

D. Rittel, N. Frage, M. P. Dariel

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The dynamic mechanical and fracture properties of a TiC porous network infiltrated with 1080 steel are reported. Following infiltration, the cermet is subjected to various heat treatments that affect essentially the steel matrix. Dynamic compression tests show that the heat treatments increase the fracture strength of the cermet. The quasi-static fracture toughness (KIc) is also increased by the heat treatments. The dynamic (initiation) fracture toughness (KIc) is substantially higher (by about a factor of 3) than its static counterpart. Failure mechanisms consist mainly of cleavage of the TiC and matrix grains, along with minor interfacial decohesion. However, dynamic loading induces substantial damage around the crack tip, consisting essentially of cleavage of TiC grains. Microcrak toughnening is believed to be responsible for the high dynamic toughness of the material. The critical microstructural fracture event is thus identified as the spreading of TiC cleavage microcracks into the neighboring steel grains.

Original languageEnglish
Pages (from-to)697-715
Number of pages19
JournalInternational Journal of Solids and Structures
Volume42
Issue number2
DOIs
StatePublished - 1 Jan 2005

Keywords

  • Cleavage
  • Dynamic fracture
  • Microcrack toughnening
  • TiC-steel cermet

ASJC Scopus subject areas

  • Modeling and Simulation
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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