Property enhancement of cast iron used for nuclear casks

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• 作者：R. K. Behera ; B. P. Mahto ; J. S. Dubey…
• 关键词：ductile iron ; nodularity ; mechanical properties ; failure modes ; nuclear industry
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：23
• 期：1
• 页码：40-48
• 全文大小：1,918 KB
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• 作者单位：R. K. Behera (1)
  B. P. Mahto (1)
  J. S. Dubey (2)
  S. C. Mishra (1)
  S. Sen (1)
  
  1. Department of Metallurgical and Materials Engineering, National Institute of Technology Rourkela, Odisha, 769008, India
  2. Bhaba Atomic Research Centre, Post Irradiation Examination Division, Mumbai, 400085, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

Ductile iron (DI) is a preferred material for use in various structural, automotive, and engineering fields because of its excellent combination of strength, toughness, and ductility. In the current investigation, we elucidate the relationship between the morphological and mechanical properties of DI intended for use in safety applications in the nuclear industry. DI specimens with various alloying elements were subjected to annealing and austempering heat treatment processes. A faster cooling rate appeared to increase the nodule count in austempered specimens, compensating for their nodularity value and subsequently decreasing their ductility and impact strength. The ductility and impact energy values of annealed specimens increased with increasing ferrite area fraction and nodularity, whereas an increase in the amounts of Ni and Cr resulted in an increase of hardness via solid solution strengthening. Austempered specimens were observed to be stronger than annealed specimens and failed in a somewhat brittle manner characterized by a river pattern, whereas the ductile failure mode was characterized by the presence of dimples.