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

Mitsushi Oyanagi, Tetsuya Suzuki, Kunihiro Yamada

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)561-566
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume51
Issue number5
Publication statusPublished - 2002 May

Fingerprint

high strength steels
High strength steel
cleavage
Hydrogen
cracks
Cracks
hydrogen
bolts
Steel
Bolts
austenite
high strength
optical microscopes
photographs
Coalescence
Austenite
coalescing
flat surfaces
Microscopes
examination

Keywords

  • Delayed fracture
  • Fractography
  • Hydrogen embrittlement
  • Intergranular crack
  • Prior austenite grain
  • Quasi-cleavage crack
  • Tempered martensite

ASJC Scopus subject areas

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

Cite this

Development of quasi-cleavage crack leading to fracture of hydrogen charged high strength steel. / Oyanagi, Mitsushi; Suzuki, Tetsuya; Yamada, Kunihiro.

In: Zairyo/Journal of the Society of Materials Science, Japan, Vol. 51, No. 5, 05.2002, p. 561-566.

Research output: Contribution to journalArticle

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