Microstructure evolutions at severely-deformed austenite/martensite interfaces of a layer-integrated steel

Taisuke Hayashi, Eiji Abe, Toru Hara, Ikuhara Yuichi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The microstructure evolution at interfaces of a layer-integrated steel sheet artificially constructed by ductile austenitic stainless (SUS304) and high-strength martensitic (SCM415) steel layers, which were bonded through a cold-rolling and a subsequent annealing at 1 000°C, has been investigated using scanning transmission electron microscopy (STEM) combined with energy dispersive X-ray spectroscopy (EDS). We find that a significant microstructural reconstruction around the SUS304/SCM415 interface has been accomplished during a short-time annealing followed by water-quenching; the resultant microstructures are found to consist of recrystallized austenite and lath martensite grains for the SUS304 and SCM415 layers, respectively. Interestingly, the original SUS304/SCM415 interface appears to migrate and extend into the SUS304 side, an occurrence of which can be reasonably explained by the martensitic transformation across the composition-gradient interface during quenching. These microstructural evolutions fairly account for a microscopic mechanism on how hetero-interface bonding can be achieved via simple cold-rolling/annealing procedures.

Original languageEnglish
Pages (from-to)1406-1413
Number of pages8
JournalIsij International
Volume49
Issue number9
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Interface structure
  • Phase transformation
  • Scanning transmission electron microscopy
  • Severe plastic deformation
  • Steels

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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