ＨＩＰ処理によるＦＤＩ材の高サイクル疲労強度の向上

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書誌事項

タイトル別名
  • Improvement of High Cycle Fatigue Strength by Hot Isostatic Pressing on Ferritic Ductile Cast Iron.
  • HIP ショリ ニヨル FDIザイ ノ コウ サイクル ヒロウ キョウド ノ

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抄録

Cast defects such as microshrinkage reduce the for fatigue strength and reliabilty of ductile cast iron even though full attention is given for production of the test piece, and so HIP (hot isostatic pressing) is applied to FDI (ferritic ductile cast iron) in order to reduce microshrinkage. After that, rotating bending fatigue tests were carried out. HIP did not change the properties of graphite drains such as mean diameter, nodularity and nodule count. However microshrinkage in the HIP-FDI was completely suppressed. The reduction effect of cast defects by HIP treatment was shown by density measurement and the mesults of close observations of the fracture surface and the crack initiation site. The fatigue strength was improved at the whole region of fatigue life and the fatigue limit was about 1.32 times that of the material subjected to heat treatment with HIP.

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