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Development of ferrite/bainite bands and study of bainite transformation retardation in HSLA steel during continuous cooling

Journal Article


Abstract


  • The development of banded structure in HSLA steel during continuous cooling has been systematically studied using dilatometry and microstructural observations. At low cooling rates (<10 C/min), the microstructure contains alternating bands of ferrite and a mixture of pearlite and bainite. At higher cooling rate (>10 C/min), the formation of pearlite is suppressed, and the corresponding microstructure consists of banded ferrite and bainite. Dilatometric analysis indicates that as ferrite and pearlite transformation at low rates (or ferrite transformation at higher rates) completes, Manganese (Mn) and Carbon (C) concentration in austenite can retard the bainitic transformation and result in the transformation stagnancy phenomenon. The magnitude of retardation and the bainite morphology are affected by Mn and C concentration. The increased cooling rate decreases Mn and C content in bainite, and then the length of the stagnant stage decreases and bainite morphology changes from lower bainite to acicular ferrite. © 2014 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.

Publication Date


  • 2014

Citation


  • Shi, L., Yan, Z., Liu, Y., Yang, X., Qiao, Z., Ning, B., & Li, H. (2014). Development of ferrite/bainite bands and study of bainite transformation retardation in HSLA steel during continuous cooling. Metals and Materials International, 20(1), 19-25. doi:10.1007/s12540-014-1006-0

Scopus Eid


  • 2-s2.0-84893159898

Web Of Science Accession Number


Start Page


  • 19

End Page


  • 25

Volume


  • 20

Issue


  • 1

Abstract


  • The development of banded structure in HSLA steel during continuous cooling has been systematically studied using dilatometry and microstructural observations. At low cooling rates (<10 C/min), the microstructure contains alternating bands of ferrite and a mixture of pearlite and bainite. At higher cooling rate (>10 C/min), the formation of pearlite is suppressed, and the corresponding microstructure consists of banded ferrite and bainite. Dilatometric analysis indicates that as ferrite and pearlite transformation at low rates (or ferrite transformation at higher rates) completes, Manganese (Mn) and Carbon (C) concentration in austenite can retard the bainitic transformation and result in the transformation stagnancy phenomenon. The magnitude of retardation and the bainite morphology are affected by Mn and C concentration. The increased cooling rate decreases Mn and C content in bainite, and then the length of the stagnant stage decreases and bainite morphology changes from lower bainite to acicular ferrite. © 2014 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.

Publication Date


  • 2014

Citation


  • Shi, L., Yan, Z., Liu, Y., Yang, X., Qiao, Z., Ning, B., & Li, H. (2014). Development of ferrite/bainite bands and study of bainite transformation retardation in HSLA steel during continuous cooling. Metals and Materials International, 20(1), 19-25. doi:10.1007/s12540-014-1006-0

Scopus Eid


  • 2-s2.0-84893159898

Web Of Science Accession Number


Start Page


  • 19

End Page


  • 25

Volume


  • 20

Issue


  • 1