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Using differential scanning calorimetry to characterize the precipitation and dissolution of V(CN) and VC particles during continuous casting and reheating process

Published online by Cambridge University Press:  26 June 2018

Mujun Long ,
Tao Liu ,
Huabiao Chen ,
Dengfu Chen ,
Huamei Duan ,
Helin Fan ,
Kai Tan  and
Wenjie He
Mujun Long*
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Tao Liu
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Huabiao Chen*
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Dengfu Chen*
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Huamei Duan
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Helin Fan
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Kai Tan
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Wenjie He*
Affiliation:
Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: longmujun@cqu.edu.cn
b)e-mail: chendfu@cqu.edu.cn
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Abstract

In this work, differential scanning calorimetry (DSC) was used to characterize and analyze the precipitation/dissolution kinetics of second phase particles during the cooling/reheating process in a vanadium microalloyed steel. The results indicated that three obvious exothermic peaks were detected on the cooling DSC curve. Furthermore, three corresponding endothermic peaks were also detected on the heating DSC curve. Combined with thermodynamic calculation and transmission electron microscopy analysis, these three exothermic peaks along cooling DSC curve were defined as the precipitation reaction of V(CN), the reaction of austenite transformation into ferrite and the precipitation reaction of VC, respectively. Meanwhile, three corresponding reverse reactions for cooling were also defined along the reheating DSC curve. The linear regression result revealed that the precipitation activation energies for V(CN) and VC were identified as 311.2 kJ/mol and 167.6 kJ/mol, respectively. The dissolution activation energies for VC and V(CN) were identified as 255.4 kJ/mol and 592.6 kJ/mol, respectively.

Keywords

differential scanning calorimetrysecond phase particlesprecipitation kineticsdissolution kineticsactivation energy
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 18 , 28 September 2018 , pp. 2784 - 2795
Copyright
Copyright © Materials Research Society 2018 

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