Effects of Defects on Fatigue Strength of Aluminum Cast Alloys (AC4CH) and Evaluation of Fatigue Limit

• Sugiyama Yoshihiro

  武蔵工業大学　工博

• Mizushima Hidekazu

  同大学院

Bibliographic Information

Other Title

• アルミニウム合金AC4CHの疲労強度に及ぼす欠陥の影響と疲労限度評価
• アルミニウム ゴウキン AC4CH ノ ヒロウ キョウド ニ オヨボス ケッカ

Abstract

  The effects of H₂ gas content on fatigue strength of aluminum cast alloys (AC4CH) and improvement by atmosphric pressure casting, 1MPa pressure casting and 773K-100MPa HIP treatment were investigated from the veiwpoint of defects, a method for evaluating the conservative fatigue limit was proposed. The main results obtained were ; (1) 1MPa pressure casting and HIP treatment were effective in improving the fatigue limit of AC4CH, bcause the defect size in 1MPa pressure casting and HIP treatment is smaller than that in atmospheric pressure casting. (2) The fracture origin proceeds from microshrinkage to adjoining blow holes as H₂ gas content increases, but the size of each blow hole is the same as that of the microshrinkage. Consequently, H₂ gas content has little effect on fatigue strength. (3) The conservative fatigue limit of aluminum cast alloys can be evaluated by substituting √area_max estimated by extreme statistics in the following equation. σ_w=α·σ_B/(√area_max)^0.161

Journal

• Journal of Japan Foundry Engineering Society

  Journal of Japan Foundry Engineering Society 68 (2), 118-123, 1996

  Japan Foundry Engineering Society

Details

• CRID: 1390282681484260224
• NII Article ID: 130004556218
• NII Article ID: 10002112999
• NII Book ID: AN10514770
• DOI: 10.11279/jfes.68.118
• COI: 1:CAS:528:DyaK28Xitlyls7g%3D
• ISSN: 21855374
• ISSN: 13420429
• NDL BIB ID: 3976323
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3976323
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • Crossref
• Abstract License Flag: Disallowed