MODE II CRACK OBSERVED AT THE ORIGIN OF FISH EYE FOR SCr 420 CARBURIZED STEEL.

Chitoshi Masuda, Satoshi Nishijima, Hideshi Sumiyoshi, Yoshihisa Tanaka, Akira Ishii

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The mechanism of the initiation of fish eye failure was examined by stereography of the fracture surface of SCr 420 carburized steel tested under rotating bending. Three modes of fish eye nucleation were observed: mode I crack initiation from nonmetallic inclusion (ni), mode II crack initiation from ni followed by the transition to mode I crack, and mode II crack initiation at the martensitic lath interface. The mode II crack plane was close to or less inclined than the plane of maximum shear stress. The maximum length of mode II crack was longer when the local stress at the origin was lower. The transition from mode II to mode I occurred at the threshold mode I stress intensity factor.

Original languageEnglish
Pages (from-to)664-669
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume34
Issue number381
Publication statusPublished - 1985 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Metals and Alloys
  • Polymers and Plastics

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    Masuda, C., Nishijima, S., Sumiyoshi, H., Tanaka, Y., & Ishii, A. (1985). MODE II CRACK OBSERVED AT THE ORIGIN OF FISH EYE FOR SCr 420 CARBURIZED STEEL. Zairyo/Journal of the Society of Materials Science, Japan, 34(381), 664-669.