Microstructural study of an age hardenable martensitic steel deformed by equal channel angular pressing

M. Iranpour Mobarake, M. Nili-Ahmadabadi, B. Poorganji, A. Fatehi, H. Shirazi, Tadashi Furuhara, Habibi Parsa, S. Hossein Nedjad

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Effect of large-strain deformation by equal channel angular pressing on the microstructure of a martensitic age hardenable steel, namely 18 Ni (3 0 0) maraging steel, was studied by means of transmission electron microscopy. Equal channel angular pressing was carried out on the solution-annealed steel up to four passes at room temperature through the route Bc using a die with an inner angle of 90°. It was found that the initial martensitic structure of the solution-annealed steel evolves to a heterogeneously deformed structure consisting of ultrafine grains and lamellar dislocation cell blocks. Selected-area electron diffraction patterns revealed large orientation spread within the deformed structure. High density of dislocations and elastic lattice distortions were found in the deformed and aged microstructures.

Original languageEnglish
Pages (from-to)172-176
Number of pages5
JournalMaterials Science and Engineering A
Volume491
Issue number1-2
DOIs
Publication statusPublished - 2008 Sep 15

Keywords

  • Equal channel angular pressing
  • Maraging steel
  • Martensite
  • Ultrafine grain

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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