CRACK PROPAGATION PROPERTIES ON HIP-TREATED CAST ALUMINUM ALLOYS

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概要

• 論文の詳細を見る

• Fatigue crack propagation tests with compact type(CT)specimens were carried out using three kinds of cast aluminum alloys designated AC4CH, AC1B and AC7A, which were subjected to hot isostatic pressing(HIP)treatment to reduce microshrinkage. Although the HIP-treated AC4CH showed a significant improvement of high-cycle fatigue strength under a rotating bending load, the crack propagation rate was the highest and the crack propagation threshold was the lowest among the materials included with a conventionally produced AC4CH. Since AC4CH has a eutectic microstructure, and since many fine eutectic silicon particles exist, fatigue cracks propagate easily along the eutectic part of the microstructure. The difference in crack propagation behavior represented by da/dN-ΔK relationship was well evaluated in terms of ΔK_eff. Microshrinkage was found to cause a considerable rough fracture surface and secondary cracks, and appeared to conduce the crack closure.

• 社団法人日本材料学会の論文
• 1998-09-15

著者

• OCHI Yasuo

  University of Electro-Communications

• ISHII Akira

  Department of Medical Zoology, Jichi Medical School

• Ochi Y

  University Of Electro-communications

• Ochi Yasuo

  Department Of Mechanical And Control Engineering The University Of Electro-communications

• KUBOTA Masanobu

  Department of Mechanical Engineering Science, Kyushu University

• Shibata Ryoichi

  Casting Research Laboratory Hitachi Metals Ltd.

• Kubota M

  Kyushu Univ. Fukuoka Jpn

• Kubota Masanobu

  Department Of Mechanical Engineering Science Kyushu University

• Ishii Akira

  Department Of Angiology And Cardiology Kitasato University Graduate School Of Medical Sciences

• Ishii Akira

  Department Of Mechanical And Control Engineering The University Of Electro-communications

• Ochi Yasuo

  Department of Bioscience and Chemistry, Faculty of Agriculture, Hokkaido University

• Kubota Masanobu

  Department of Intelligent Machinery & Systems, Kyushu University

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