Creep-Induced Microstructural Change in 304-Type Austenitic Stainless Steel

• Toshihiro Ohtani

  Materials Lab., Ebara Research Co. Ltd., 4-2-1 Hon-Fujisawa, Fujisawa, Kanagawa 251-8502, Japan

• Hirotsugu Ogi

  Graduate School, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka, 560-8531, Japan

• Masahiko Hirao

  Graduate School, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka, 560-8531, Japan

抄録

We studied microstructure changes of 304-type austenitic stainless steel subjected to a tensile stress at 973K. We monitored the shear-wave attenuation and velocity using electromagnetic acoustic resonance (EMAR). The attenuation peaks at 40% to 50% and a minimum value at 70% of the creep life, being independent of the applied stress. A drastic change in dislocation mobility and arrangement interrupted this novel attenuation phenomenon, as supported by SEM and TEM observations. The relationship between attenuation change and microstructure evolution can be explained with the string’s model. EMAR demonstrates a potential for assessing damage advance and predicting the remaining creep life of metals.

収録刊行物

• Journal of Engineering Materials and Technology

  Journal of Engineering Materials and Technology 128 (2), 234-242, 2005-10-24

  ASME International

キーワード

• Mechanical Engineering
• Mechanics of Materials
• Condensed Matter Physics
• General Materials Science

詳細情報

• CRID: 1363388843643710464
• NII論文ID: 30020267764
• DOI: 10.1115/1.2172629
• ISSN: 15288889
• ISSN: 00944289
• Web Site: http://asmedigitalcollection.asme.org/materialstechnology/article-pdf/128/2/234/5565604/234_1.pdf
• データソース種別:
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  • CiNii Articles