Archives of Metallurgy and Materials

Institute of Metallurgy and Materials Science of Polish Academy of Sciences
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In-Situ Observation of Acicular Ferrite Transformation in High-Strength Low-Alloy Steel Using Confocal Laser Scanning Microscopy

  • Sang-In Lee (Seoul National University of Science and Technology, Department of Materials Science and Engineering) ;
  • Seung-Hyeok Shin (Seoul National University of Science and Technology, Department of Materials Science and Engineering) ;
  • Hyeonwoo Park (Korea University, Department of Materials Science and Engineering) ;
  • Hansoo Kim (Korea University, Department of Materials Science and Engineering) ;
  • Joonho Lee (Korea University, Department of Materials Science and Engineering) ;
  • Byoungchul Hwang (Seoul National University of Science and Technology, Department of Materials Science and Engineering)
  • Published : 20220000
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Abstract

In-situ observation of the transformation behavior of acicular ferrite in high-strength low-alloy steel using confocal laser scanning microscopy was discussed in terms of nucleation and growth. It is found that acicular ferrite nucleated at dislocations and slip bands in deformed austenite grains introduced by hot deformation in the non-recrystallization austenite region, and then proceeded to grow into an austenite grain boundary. According to an ex-situ EBSD analysis, acicular ferrite had an irregular shape morphology, finer grains with sub-grain boundaries, and higher strain values than those of polygonal ferrite. The fraction of acicular ferrite was affected by the deformation condition and increased with increasing the amount of hot deformation in the non-recrystallization austenite region.

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Acknowledgement

This study was supported by the Research Program funded by the SeoulTech (Seoul National University of Science and Technology)