高強度鋼の超長寿命疲労破壊における水素の影響とODAの破面形態  [in Japanese] Effect of Hydrogen on Ultralong Life Fatigue Failure of a High Strength Steel and Fracture Morphology of ODA  [in Japanese]

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Author(s)

Abstract

ODA (Optically Dark Area) in the vicinity of inclusions at fracture origin has a crucial importance in the mechanism of ultralong life fatigue failure. From the authors' previous studies, it has been presumed that ODA is formed by the fatigue due to cyclic stress coupled with hydrogen which is trapped by the inclusion at fracture origin. The fracture morphology of ODA was observed by a SEM with low resolution, a SEM with high resolution, an AFM and a Laser microscope. The ODA observed by the SEM with low resolution revealed a granular morphology. However, the high resolution SEM images obtained by tilting the fracture surface identified that the true morphology of ODA was not granular but was very sharp and irregularly rough. In order to reveal the effect of hydrogen on the formation of ODA, the microstructure around the inclusions at fracture origin was investigated. The hardness in the vicinity of inclusions in Specimens QT which contained 0.7-0.9 ppm hydrogen was much lower than that for Specimens VQ which contained∼0.01 ppm hydrogen.

Journal

  • TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 69(681), 908-915, 2003-05-25

    The Japan Society of Mechanical Engineers

References:  28

Cited by:  2

Codes

  • NII Article ID (NAID)
    110002370391
  • NII NACSIS-CAT ID (NCID)
    AN0018742X
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03875008
  • NDL Article ID
    6599650
  • NDL Source Classification
    ZM16(科学技術--科学技術一般--工業材料・材料試験)
  • NDL Call No.
    Z14-737
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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