EBSD investigation on microstructure transformation in low carbon steel during continuous cooling

B. Su, H. P. Lin, Jui-Chao Kuo, Y. T. Pan

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this study the microstructure in low carbon steel during phase transformation was systematically investigated using dilatometry, optical microscopy as well as EBSD. The specimens after annealing at 900°C for 3 min were subsequently cooled at 0·3-100°C s -1 for dilatometry, in order to determine the continuous cooling transformation (CCT) diagram. Then the microstructures were analysed by optical microscopy (OM) and electron backscattering diffraction (EBSD). Dilatometry, optical microscopy as well as image quality technique in EBSD were combined together to determine the continuous cooling transformation diagram of low carbon steel. As increasing in the cooling rate from 1 to 30°C s -1 , the fraction of ferrite is almost 90% and the phase transformation occurs from pearite to bainite at the cooling rate between 10 to 20°C s -1 . Dans cette étude, on a examiné systématiquement la microstructure de l'acier à faible teneur en carbone lors de la transformation de phase en utilisant la dilatomé trie, la microscopie optique ainsi que la DERD. Après un recuit à 900°C pendant 3 min, on a ensuite refroidi les é chantillons entre 0·3 et 100°C s -1 pour l'étude de dilatomé trie, afin de déterminer le diagramme de transformation en refroidissement continu (CCT). On a ensuite analysé la microstructure par microscopie optique (MO) et par diffraction des é lectrons ré trodiffusés (DERD). On a combiné la dilatomé trie, la microscopie optique ainsi que la technique de haute qualité de l'image de DERD pour dé terminer le diagramme de transformation en refroidissement continu de l'acier à faible teneur en carbone. Avec l'augmentation de la vitesse de refroidissement de 1 à 30°C s -1 , la fraction de ferrite atteint presque 90% et la transformation de phase de perlite à bainite a lieu à une vitesse de refroidissement entre 10 et 20°C s -1 .

Original languageEnglish
Pages (from-to)352-361
Number of pages10
JournalCanadian Metallurgical Quarterly
Volume53
Issue number3
DOIs
Publication statusPublished - 2014 Jan 1

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Low carbon steel
Backscattering
Diffraction
Cooling
Microstructure
Electrons
Optical microscopy
Bainite
Ferrite
Phase transitions
Image quality
Annealing

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Industrial and Manufacturing Engineering

Cite this

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title = "EBSD investigation on microstructure transformation in low carbon steel during continuous cooling",
abstract = "In this study the microstructure in low carbon steel during phase transformation was systematically investigated using dilatometry, optical microscopy as well as EBSD. The specimens after annealing at 900°C for 3 min were subsequently cooled at 0·3-100°C s -1 for dilatometry, in order to determine the continuous cooling transformation (CCT) diagram. Then the microstructures were analysed by optical microscopy (OM) and electron backscattering diffraction (EBSD). Dilatometry, optical microscopy as well as image quality technique in EBSD were combined together to determine the continuous cooling transformation diagram of low carbon steel. As increasing in the cooling rate from 1 to 30°C s -1 , the fraction of ferrite is almost 90{\%} and the phase transformation occurs from pearite to bainite at the cooling rate between 10 to 20°C s -1 . Dans cette {\'e}tude, on a examin{\'e} syst{\'e}matiquement la microstructure de l'acier {\`a} faible teneur en carbone lors de la transformation de phase en utilisant la dilatom{\'e} trie, la microscopie optique ainsi que la DERD. Apr{\`e}s un recuit {\`a} 900°C pendant 3 min, on a ensuite refroidi les {\'e} chantillons entre 0·3 et 100°C s -1 pour l'{\'e}tude de dilatom{\'e} trie, afin de d{\'e}terminer le diagramme de transformation en refroidissement continu (CCT). On a ensuite analys{\'e} la microstructure par microscopie optique (MO) et par diffraction des {\'e} lectrons r{\'e} trodiffus{\'e}s (DERD). On a combin{\'e} la dilatom{\'e} trie, la microscopie optique ainsi que la technique de haute qualit{\'e} de l'image de DERD pour d{\'e} terminer le diagramme de transformation en refroidissement continu de l'acier {\`a} faible teneur en carbone. Avec l'augmentation de la vitesse de refroidissement de 1 {\`a} 30°C s -1 , la fraction de ferrite atteint presque 90{\%} et la transformation de phase de perlite {\`a} bainite a lieu {\`a} une vitesse de refroidissement entre 10 et 20°C s -1 .",
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EBSD investigation on microstructure transformation in low carbon steel during continuous cooling. / Su, B.; Lin, H. P.; Kuo, Jui-Chao; Pan, Y. T.

In: Canadian Metallurgical Quarterly, Vol. 53, No. 3, 01.01.2014, p. 352-361.

Research output: Contribution to journalArticle

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