Grain boundary engineering for intergranular corrosion resistant austenitic stainless steel

H. Kokawa, M. Shimada, Z. J. Wang, Y. S. Sato, M. Michiuchi

Research output: Contribution to journalConference article

12 Citations (Scopus)

Abstract

Optimum parameters in the thermomechanical treatment during grain boundary engineering (GBE) were investigated for improvement of intergranular corrosion resistance of type 304 austenitic stainless steel. The grain boundary character distribution (GBCD) was examined by orientation imaging microscopy (OIM). The intergranular corrosion resistance was evaluated by electrochemical potentiokinetic reactivation (EPR) and ferric sulfate-sulfuric acid tests. The sensitivity to intergranular corrosion was reduced by the thermomechanical treatment and indicated a minimum at a small roll-reduction. The frequency of coincidence-site-lattice (CSL) boundaries indicated a maximum at the small pre-strain. The ferric sulfate-sulfuric acid test showed much smaller corrosion rate in the thermomechanical-treated specimen than in the base material for long time sensitization. The optimum thermomechanical treatment introduced a high frequency of CSL boundaries and the clear discontinuity of corrosive random boundary network in the material, and resulted in the high intergranular corrosion resistance arresting the propagation of intergranular corrosion from the surface.

Original languageEnglish
Pages (from-to)1005-1010
Number of pages6
JournalKey Engineering Materials
Volume261-263
Issue numberII
Publication statusPublished - 2004 Jan 1
EventAdvances in Fracture and Failure Prevention: Proceedings of the Fifth International Conference on Fracture and Strength of Solids (FEOFS2003): Second International Conference on Physics and Chemistry of Fracture and Failure Prevention (2nd ICPCF) - Sendai, Japan
Duration: 2003 Oct 202003 Oct 22

Keywords

  • Coincidence site lattice boundary
  • Grain boundary character distribution
  • Grain boundary engineering
  • Grain boundary structure
  • Intergranular corrosion
  • Orientation imaging microscopy
  • Sensitization
  • Stainless steel
  • Thermomechanical treatment

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Kokawa, H., Shimada, M., Wang, Z. J., Sato, Y. S., & Michiuchi, M. (2004). Grain boundary engineering for intergranular corrosion resistant austenitic stainless steel. Key Engineering Materials, 261-263(II), 1005-1010.