Nucleation of Dislocations Around Inclusions in Iron

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  • Kayano Hideo
    The Research Institute for Iron, Steel and Other Metals Tohoku University

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  • 鉄中の介在物のまわりからの転位の発生の観察
  • テツ チュウ ノ カイザイブツ ノ マワリ カラ ノ テンイ ノ ハッセイ ノ カンサツ

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Abstract

Nucleation of dislocations around inclusions in iron containing small particles of FeO, Al2O3 or Zr2O was investigated by means of transmission electron microscopy. Dislocation loops produced around inclusions by the prismatic punching were observed in iron containing FeO or Zr2O particles when annealed for 100 min at 800°C and furnace cooled. The number of loops generated from an inclusion varied from 2 to 18, and the loops occurred along close-packed ⟨111⟩ directions. These loops seemed to be produced by thermal stress arising, during cooling, from the difference in thermal expansion coefficient between the inclusion and the matrix. Generation of dislocations was also observed around inclusions and precipitates in iron deformed 2% at room temperature. The formation mechanism of prismatic punched dislocation loops was discussed.

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