Effect of Nb on the transformation kinetics of low carbon(manganese) steel during deformation of undercooled austenite

Guoan Chen, Wangyue Yang, Shouzhen Guo, Zuqing Sun

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    Guoan Chen, Wangyue Yang, Shouzhen Guo, and Zuqing Sun, Effect of Nb on the transformation kinetics of low carbon(manganese) steel during deformation of undercooled austenite, J. Univ. Sci. Technol. Beijing , 13(2006), No. 5, pp.411-415. https://dx.doi.org/10.1016/S1005-8850(06)60083-2
    Guoan Chen, Wangyue Yang, Shouzhen Guo, and Zuqing Sun, Effect of Nb on the transformation kinetics of low carbon(manganese) steel during deformation of undercooled austenite, J. Univ. Sci. Technol. Beijing , 13(2006), No. 5, pp.411-415. https://dx.doi.org/10.1016/S1005-8850(06)60083-2
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    Materials

    Effect of Nb on the transformation kinetics of low carbon(manganese) steel during deformation of undercooled austenite

    • Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China

    • State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

    基金项目: 

    This work was financially supported by the National High-Tech Research and Development Program of China (No.2001AA332020).

      通信作者:

      Guoan Chen E-mail: asmlab@mater.ustb.edu.cn

    中文摘要

    The hot compression tests using Gleeble 1500 were performed by varying the true strain up to 1.6 (80% reduction) in Nb-free and Nb-microalloyed steels. The effect of Nb addition on the transformation kinetics during deformation of undercooled austenite was investigated. It was found that as compared with Nb-free steel,the transformation incubation period of Nb-bearing steel was pro-longed and the transformation kinetics curves parallelly moved to higher strain because of the solute Nb drag effect. Studies on kinetics also showed that the deformation-enhanced ferrite transformation (DEFT) of the two steels were composed of three stages,which can be expressed by the J-M-A equations individually. However,the parameter n related to the mode of nucleation and growth is somewhat different in the first and second stages of the two steels,and the same in the third stage for both the steels corresponding to the nuclea-tion of retained austenite.

     

    Materials

    Effect of Nb on the transformation kinetics of low carbon(manganese) steel during deformation of undercooled austenite

    Author Affilications

      • Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China

      • State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

    • Funds: 

      This work was financially supported by the National High-Tech Research and Development Program of China (No.2001AA332020).

    • Received: 18 April 2005;
    The hot compression tests using Gleeble 1500 were performed by varying the true strain up to 1.6 (80% reduction) in Nb-free and Nb-microalloyed steels. The effect of Nb addition on the transformation kinetics during deformation of undercooled austenite was investigated. It was found that as compared with Nb-free steel,the transformation incubation period of Nb-bearing steel was pro-longed and the transformation kinetics curves parallelly moved to higher strain because of the solute Nb drag effect. Studies on kinetics also showed that the deformation-enhanced ferrite transformation (DEFT) of the two steels were composed of three stages,which can be expressed by the J-M-A equations individually. However,the parameter n related to the mode of nucleation and growth is somewhat different in the first and second stages of the two steels,and the same in the third stage for both the steels corresponding to the nuclea-tion of retained austenite.

     

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