Microstructure evolution of SUS303 free-cutting steel during hot compression process

Yunping Li, Teppei Suzuki, Ning Tang, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The hot-compression behavior and the microstructure evolution of SUS303 free-cutting steel were investigated in detail by carrying out compression tests in the temperature range of 1073-1323K and at strain rates ranging from 0.01 to 30s-1. From the true stress-true strain curves, dynamic recovery-type curve at low-temperature/high-strain rate and dynamic recrystallization-type curve at low-strain rate/high temperature were observed. During the low-temperature/low-strain rate hot-compression process, a large fraction of non-refined grains with large numbers of subgrains in their interiors were observed. These subgrains are thought to transform into new grains with further straining. During the high-temperature/low-strain rate hot compression process, discontinuous dynamic recrystallization was observed frequently. During the low-temperature/high-strain rate hot-compression process, only a few refined grains were observed near the grain boundaries, whereas at higher temperatures, a fully refined microstructure was obtained through an "explosive" static recrystallization during subsequent cooling process.

Original languageEnglish
Pages (from-to)161-168
Number of pages8
JournalMaterials Science and Engineering A
Publication statusPublished - 2013


  • Adiabatic heating
  • Dynamic recrystallization
  • Free-cutting steel
  • Hot working

ASJC Scopus subject areas

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


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