Propagation and termination of an internal crack in continuously cast austenitic stainless steel analyzed by ∑ values and the Schmid factor

Youichi Saito, Shun Ichiro Tanaka

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The formation mechanism of an internal crack was clarified from the viewpoint of the crystallography and thermal expansion. An inverse pole figure map obtained by EBSD pattern showed that the crack propagated along the grain boundaries having high ∑ values within the columnar zone. After the crack initiation, these positions were considered to undergo cracking followed by propagation toward the equiaxed side. Near the termination position, the grains ahead of crack propagation had a Schmid factor higher than 0.45 consuming elastic strain energy. Thermal expansion measurements showed that the grain with (0 0 1) orientation had the largest expansion while that with (0 1 1) the smallest. The grain boundaries neighboring the combination of (0 0 1) and (0 1 1) grains had the largest thermal stress. Therefore, thermal stress contributed to the initiation of cracking. It was thus proposed to enlarge the equiaxed zone to prevent cracking by discontinuing the crack propagation.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalInternational Journal of Cast Metals Research
Volume31
Issue number2
DOIs
Publication statusPublished - 2018 Mar 4

Keywords

  • Schmid factor
  • Stainless steel
  • crystallography
  • internal crack
  • inverse pole figure map
  • thermal expansion

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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