Development of quasi-cleavage crack leading to fracture of hydrogen charged high strength steel

Mitsushi Oyanagi, Tetsuya Suzuki, Kunihiro Yamada

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Nature of the critical crack, which triggers hydrogen assisted fracture of the high strength bolt steel ASTM A490 has been studied with an emphasis on the metallurgical observation of the subsurface quasi-cleavage crack. The macroscopic fracture facet, appeared on the SEM photograph of the fractured surface, is formed by coalescence of a number of neighbouring cracks, which have different initiation sites. Detailed examination with TEM and optical microscope revealed that the initiation and early stage of propagation prefer transgranular mode. The preferencial crack path in this type of high-strength steel traces mostly along the lath or packet boundary of the prior austenite grains.

本文言語English
ページ(範囲)561-566
ページ数6
ジャーナルZairyo/Journal of the Society of Materials Science, Japan
51
5
DOI
出版ステータスPublished - 2002 5

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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