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Evaluating tendency of freckle formation for electro-slagremelting 20SiMn2MoV ingots by experiments and simulation

Published online by Cambridge University Press:  30 September 2014

Yang Zhang ,
Weiqing Chen ,
Lie Chen ,
Qingzhong Yan  and
Yandong Zhang
Yang Zhang
Affiliation:
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, P.R. China. e-mail: zhangyang1356560@126.com
Weiqing Chen
Affiliation:
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, P.R. China. e-mail: zhangyang1356560@126.com
Lie Chen
Affiliation:
Xining Special Steel Co., LTD., Xining 810005, P.R. China
Qingzhong Yan
Affiliation:
Xining Special Steel Co., LTD., Xining 810005, P.R. China
Yandong Zhang
Affiliation:
Xining Special Steel Co., LTD., Xining 810005, P.R. China
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Abstract

Freckle defects were found in electro-slag remelting (ESR) ingots, which severely limitthe development of the larger-diameter ingots. The macrostructure and the composition ofthe freckles in a low-alloy structure steel ESR ingot were investigated to clarify thefreckle formation mechanism. The results shows that the freckles in the ingot were causedby the upward solute-rich liquid flow in the mushy zone, and the composition of thefreckles corresponds to that of the liquid, with a liquid fraction of 0.36 to 0.43. Therelative Rayleigh number (Ra), a freckle criterion considering the effect of atilted solidification front, was adopted to evaluate the freckle formation tendency in theindustrial-scale ESR ingots based on the results of the experiments, kinetic simulationand thermophysical property calculation. The calculated results of Ra are in good agreementwith the actual distribution of the freckles in the ingot.

Keywords

freckleselectro-slag remeltingkineticsRayleigh number
Type
Research Article
Information
Metallurgical Research & Technology , Volume 111 , Issue 4 , 2014 , pp. 259 - 269
Copyright
© EDP Sciences 2014

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