Improvement of transpassive Lntergranular corrosion resistance of 304 austenitic stainless steel by thermomechanical processing for twin-induced grain boundary engineering

Wei Zhong Jin, Hiroyuki Kokawa, Zhan Jie Wang, Yutaka S. Sato, Nobuyoshi Hara

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Grain boundary engineering (GBE) primarily aims to prevent the initiation and propagation of intergranular degradation along grain boundaries by frequent introduction of coincidence site lattice (CSL) boundaries into the grain boundary networks in materials. It has been reported that GBE is effective to prevent passive intergranular corrosion such as sensitization of austenitic stainless steels, but the effect of GBE on transpassive corrosion has not been clarified. In the present study, a twin-induced GBE utilizing optimized thermomechanical processing with small pre-strain and subsequent annealing was applied to introduce very high frequencies of CSL boundaries into type 304 austenitic stainless steels containing different phosphorus concentrations. The resulting steels showed much higher resistance to transpassive intergranular corrosion during the Coriou test, in comparison with the as-received ones. The high CSL frequency resulted in a very low percolation probability of random boundary networks in the over-threshold region and remarkable suppression of intergranular deterioration during GBE.

Original languageEnglish
Pages (from-to)476-481
Number of pages6
JournalIsij International
Volume50
Issue number3
DOIs
Publication statusPublished - 2010

Keywords

  • Austenitic stainless steel
  • Coincidence site lattice
  • Grain boundary engineering
  • Intergranular corrosion
  • Thermomechanical processing

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Improvement of transpassive Lntergranular corrosion resistance of 304 austenitic stainless steel by thermomechanical processing for twin-induced grain boundary engineering'. Together they form a unique fingerprint.

Cite this