Subsurface Crack Growth Behavior on High Cycle Fatigue of High Strength Steel.

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Other Title
  • 高強度鋼の高サイクル疲労域における内部き裂進展挙動
  • コウキョウドコウ ノ コウサイクル ヒロウイキ ニ オケル ナイブ キレツ シ
Published
1998
Resource Type
journal article
DOI
  • 10.1299/kikaia.64.2536
Publisher
The Japan Society of Mechanical Engineers

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Description

In order to examine the precise fatigue mechanism of so-called "fish eye" type fatigue failure emerging in very high cycle fatigue, rotating bending fatigue tests were carried out on a high strength low alloy steel. Differently fatigue damaged specimens were prepared and their cross section was carefully observed so as to gather statistical information of initiation and growth of subcracks in subsurface region. The results showed that penny-shaped subcracks were nucleated at very small inclusions before stress cycles of 104. All of the subcracks initiated at inclusions grew up at maximum to a length of the non-propagating crack, being formed in the matrix of subsurface and controlled the "true fatigue limit" of the material. To observe the internal crack growth on specimen surface, a surface-wrapped specimen was fatigued. The result revealed that the shielding of oxygen results in decreasing the fatigue strength.

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