Grain boundary engineering of austenitic stainless steels

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Grain boundary phenomena strongly depend on grain boundary structure and character, i.e., coincidence site lattice (CSL) boundaries, as contrasted with random boundaries, are highly resistant to grain boundary deterioration. Grain boundary engineering (GBE) primarily intends to prevent the initiation and propagation of intergranular degradation along random boundaries by frequent introduction of CSL boundaries into the grain boundary networks in materials. A high frequency of CSL boundaries by GBE leads to high resistance to grain boundary deterioration. By twin-induced GBE utilizing optimized one-step thermomechanical processing with small pre-strain and subsequent annealing, a very high frequency of CSL boundaries was introduced into type 304 and 316 austenitic stainless steels. The resulting steels indicated remarkably high resistance to intergranular corrosion during corrosion tests. The high CSL frequency resulted in a very low percolation probability of random boundary networks in the per-threshold and a remarkable suppression of intergranular deterioration during twin-induced GBE.

Original languageEnglish
Title of host publicationTrends in Welding Research - Proceedings of the 8th International Conference
Pages11-16
Number of pages6
DOIs
Publication statusPublished - 2009 Dec 1
Event8th International Conference on Trends in Welding Research - Pine Mountain, GA, United States
Duration: 2008 Jun 12008 Jun 6

Publication series

NameASM Proceedings of the International Conference: Trends in Welding Research

Other

Other8th International Conference on Trends in Welding Research
CountryUnited States
CityPine Mountain, GA
Period08/6/108/6/6

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering

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