Subsurface crack generation in high-cycle fatigue for high strength alloys

• Umezawa Osamu

  National Research Institute for Metals

• Nagai Kotobu

  National Research Institute for Metals

書誌事項

タイトル別名

• Fatigue, Cyclic Deformation and Microstructure. Subsurface Crack Generation in High-cycle Fatigue for High Strength Alloys.

抄録

In order to progress in the understanding of fatigue fracture process for high strength alloys, the previous studies of the subsurface fatigue crack generation are reviewed. A change in crack initiation mechanism from specimen surface to specimen interior often introduces a plateau ("knee") followed by a rather sharp drop in the shape of S-N curve. Various subsurface crack origins are related with microstructural crackings and pre-existing defects. The subsurface initiation site is formed as a Stage I crack. A new explanation of microcrack growth is proposed for the subsurface crack generation process. The subsurface crack size is the most important parameter to determine how the crack becomes a fatal crack. The size highly depends on the maximum cyclic stress range, which implies a ΔK_th threshold controlling mechanism. The dislocation structures in high-cycle fatigue are fairly planar for both austenitic steel and titanium alloy.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 37 (12), 1170-1179, 1997

  一般社団法人 日本鉄鋼協会

キーワード

• fatigue crack initiation
• Stage I (Mode II) crack
• high-cycle fatigue
• defect
• fish-eye
• threshold stress intensity factor range
• low temperature
• titanium alloy
• high strength steel
• austenitic steel

詳細情報

• CRID: 1390282681429968896
• NII論文ID: 10002457724
• NII書誌ID: AA10680712
• DOI: 10.2355/isijinternational.37.1170
• COI: 1:CAS:528:DyaK1cXitVSqsrc%3D
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://hdl.handle.net/10131/7943
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/37/12/37_12_1170/_pdf
• 本文言語コード: en
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