INFLUENCE OF LAMELLAR STRUCTURE ON FATIGUE FRACTURE MECHANISM FOR SB49 STEEL.

Chitoshi Masuda, Satoshi Nishijima, Hideshi Sumiyoshi, Masuo Shimodaira

Research output: Contribution to journalArticle

Abstract

Fatigue crack propagation tests were carried out along different orientations of a hot rolled SB49 steel plate with or without homogenized heat treatment. The as-received material showed directionality in fatigue crack propagation due to the effect of lamellar structure, while the homogenizing treatment made crack growth isotropic both macroscopically and microscopically. Fractographic examination revealed that the ordinary striation mechanism was predominant when the crack plane was normal to the lamellar structure as well as for any orientation of the homogenized structure. For the case where crack plane was parallel to the lamellar structure, however, sub-cracks initiated at the edge of MnS inclusions located ahead of the main crack, and each propagated independently by a striation mechanism to join with the main crack.

Original languageEnglish
Pages (from-to)1019-1025
Number of pages7
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume33
Issue number371
Publication statusPublished - 1984 Aug

ASJC Scopus subject areas

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

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    Masuda, C., Nishijima, S., Sumiyoshi, H., & Shimodaira, M. (1984). INFLUENCE OF LAMELLAR STRUCTURE ON FATIGUE FRACTURE MECHANISM FOR SB49 STEEL. Zairyo/Journal of the Society of Materials Science, Japan, 33(371), 1019-1025.