Effect of γ-phase stability on local deformation energy of α-γ duplex stainless steel

Masayuki Yamamoto, Ryosuke Ochi, Kyono Yasuda, Masatoshi Aramaki, Shinji Munetoh, Osamu Furukimi

Research output: Contribution to journalArticle

Abstract

The effect of austenite (γ) phase stability in the local deformation region on the deformation energy of ferrite (α)-γ duplex stainless steel is investigated using tensile testing. The uniform deformation energy values of both the γ-stable and unstable duplex stainless steels are similar, while the local deformation energy of γ-stable duplex stainless steel is larger than that of γ-unstable duplex stainless steel. In γ-unstable duplex stainless steel, the difference in nano-indentation hardness between the α and transformed martensite (α) phases increases remarkably beneath the fractured surface. Low-voltage electron microscopy observations reveal that voids grow rapidly at the grain boundaries between the α and α phases beneath the fractured surface, resulting in a decrease in the local deformation energy in γ-unstable duplex stainless steel.

Original languageEnglish
Pages (from-to)1379-1385
Number of pages7
JournalMaterials Transactions
Volume58
Issue number10
DOIs
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

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

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