Dynamic recrystallization of Fe-Cr alloys by atmospheric-controlled induction-heating fine particle peening

Shoichi Kikuchi, Ikko Tanaka, Shogo Takesue, Jun Komotori, Keishi Matsumoto

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Atmospheric-controlled induction-heating fine particle peening (AIH-FPP) was conducted in a N2 atmosphere to form ultrafine grains on the surface of Fe-Cr alloys. The surface microstructure of Fe-2%Cr alloy and Fe-10%Cr alloy treated with AIH-FPP at 973 K and 1073 K was characterized using optical microscopy, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). AIH-FPP can be used as a thermomechanical process to form ultrafine grains on the surface of Fe-Cr alloys because strain is induced by AIH-FPP at a high rate and high temperature during dynamic recrystallization. In particular, the grain size of Fe-Cr alloys tends to decrease with increasing AIH-FPP treatment time. This is attributed to the increase in the strain induced by AIH-FPP with increasing AIH-FPP treatment time during dynamic recrystallization. Thus, the AIH-FPP-induced stratification structure composed of fine grains becomes more pronounced with increasing treatment time. Furthermore, the AIH-FPP treatment temperature at which fine grains are formed depends on the Cr concentration of the Fe-Cr alloys.

Original languageEnglish
Pages (from-to)410-417
Number of pages8
JournalSurface and Coatings Technology
Volume344
DOIs
Publication statusPublished - 2018 Jun 25

Keywords

  • Dynamic recrystallization
  • Grain refinement
  • Peening
  • Thermomechanical processing

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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