Split and shift of -martensite peak in an X-ray diffraction profile during hydrogen desorption: A geometric effect of atomic sequence

Motomichi Koyama, Yuji Abe, Kaneaki Tsuzaki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Cryogenic X-ray diffraction measurements demonstrated a split of the -martensite peak at 193 K in a hydrogen-charged austenitic steel. Only the higher angle peak remained after aging at room temperature. This phenomenon can be interpreted by a change in the interstitial hydrogen position. Particularly, the motion of the leading partial involved in -martensitic transformation can move interstitial hydrogen from a tetrahedron to an octahedron site, expanding the lattice. Subsequently, the hydrogen can move back to the tetrahedron site, which relatively shrinks the lattice. The two different hydrogen positions cause the peak to split.

Original languageEnglish
Pages (from-to)1745-1747
Number of pages3
JournalIsij International
Volume58
Issue number9
DOIs
Publication statusPublished - 2018 Sep 15

Keywords

  • Austenitic steel
  • Hydrogen
  • Lattice dilatation
  • Martensitic transformation
  • X-ray diffraction

ASJC Scopus subject areas

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

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