１８％Ｎｉマルエージング鋼の疲労き裂の発生と初期進展挙動

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タイトル別名
  • Fatigue Crack Initiation in 18% Ni Maraging Steel and its Propagation Behavior in Earlier Stage
  • 18パーセント Ni マルエージング コウ ノ ヒロウ キレツ ノ ハッセイ

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抄録

In this study, the initiation and propagation behaviors of cracks emerged in 18% Ni maraging steel sheets were investigated under cyclic tensile loading. A shallow notch was provided to the sheet specimen in order to facilitate the direct observation by an optical microscope. The main results obtained are summarized as follows.<br>(1) Fatigue cracks initiate mainly from the inclusions at the notch root near the middle of the thickness, and the fracture first proceeds along the prior austenitic grain boundaries or the packet boundaries. Then the main crack propagates, forming ridge patterns with dimples until the catastrophic shear fracture occurs.<br>(2) An exponential relation holds between the stress intensity factor range and the crack propagation rate even in the earlier stage of the propagation. The value of the exponent is about 2.63 and is different from that in the progressed stage obtained in the previous research.<br>(3) Secondary cracks are observed everywhere, which intersect the fracture surface. These cracks have no characteristic orientation in the region of the ridge pattern, but they tend to appear in parallel to the striations at the place where the latters are formed.

収録刊行物

  • 材料

    材料 25 (276), 888-893, 1976

    公益社団法人 日本材料学会

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