Hostname: page-component-76fb5796d-r6qrq Total loading time: 0 Render date: 2024-04-26T14:55:13.013Z Has data issue: false hasContentIssue false
  • English
  • Français

Evaluating tendency of freckle formation for electro-slag remelting 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
Get access

Abstract

Freckle defects were found in electro-slag remelting (ESR) ingots, which severely limit the development of the larger-diameter ingots. The macrostructure and the composition of the freckles in a low-alloy structure steel ESR ingot were investigated to clarify the freckle formation mechanism. The results shows that the freckles in the ingot were caused by the upward solute-rich liquid flow in the mushy zone, and the composition of the freckles corresponds to that of the liquid, with a liquid fraction of 0.36 to 0.43. The relative Rayleigh number (Ra), a freckle criterion considering the effect of a tilted solidification front, was adopted to evaluate the freckle formation tendency in the industrial-scale ESR ingots based on the results of the experiments, kinetic simulation and thermophysical property calculation. The calculated results of Ra are in good agreement with 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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Yuan, L., Lee, P.D., Acta Mater 60 (2012) 4917-4926
Auburtin, P., Wang, T., Mater. Trans. B 31 (2000) 801-811
Ma, D., Wu, Q., Polaczek, A.B., Metall. Mater. Trans. B 43 (2012) 344-353
Valdés, J., King, P., Liu, X.B., Metall. Mater. Trans. A 41 (2010) 2408-2416
R.J.  Siddall,   Superalloys 1991, edited by, E.A. Loria, TMS, 1991, pp. 29-41
K.O. Yu, J.A. Domingue, Superalloys 1989, edited by, E.A. Loria, TMS, 1989, pp. 33-48
A.D. Helms, C.B. Adasczik, L.A. Jackman, Superalloys, edited by, R.D. Kissinger, TMS, 1996, pp. 427-433
Yu, K.O., Domingue, J.A., Maurer, G.E., Flanders, H.D., JOM 38 (1986) 46-50
Flemings, M.C. et al., Trans. Metall. AIME 239 (1967) 1449-1461
Flemings, M.C. et al., Trans. Metall. AIME 242 (1968) 41-55
Mehrabian, R., Keane, M., Flemings, M.C., Mater. Trans. 1 (1970) 1209-1220
Mehrabian, R., Keane, M., Flemings, M.C., Mater. Trans. 1 (1970) 3238-3241
W.H. Yang, W. chen, K.M. Chang, Superalloys 718, 625, 706 and various derivatives, edited by E.A. Loria, TMS, 2001, pp. 113-122
Yang, W.H., Chen, W., Chang, K.M., Mannan, S., deBarbadillo, J., Metall. Mater. Trans. A 32 (2001) 397-406
Yang, W.H., deBarbadillo, John J., Morita, K., Suzuki, T., Chen, W., Chang, K.M., JOM 56 (2004) 56-61
Wang, X.H., Ward, R.M., Jacobs, M.H., Barratt, M.D., Metall. Mater. Trans. A 39 (2008) 2981-2989
Amouyal, Y., Seidman, D.N., Acta Mater 59 (2011) 6729-6742
Shevchenko, N., Boden, S., Gerbeth, G., Eckert, S., Metall. Mater. Trans. A 44 (2013) 3797-3808
Long, Z.D., Liu, X.B., Yang, W.H., Chang, K.M., Barbero, E., Mater. Sci. Eng. A 386 (2004) 254-261
Avyle, J.A.V.D., Brooks, J.A., Powell, A.C., JOM 50 (1998) 22-25
Lippard, H.E., Campbell, C.E., Rklind, T.B., Borggren, U., Kellgren, P., Dravid, V.P., Olson, G.B., Metall. Mater. Trans. B 29 (1998) 205-210
Borgenstam, A., Engstrom, A., hoglund, L., Agren, J., J. Phase Equilibria 21 (2000) 269-280
Guo, Z., Saunders, N., Miodownik, A.P., Schillé, J.P., Mater. Sci. Eng. A 413 (2005) 465-469
Guo, Z., Saunders, N., Miodownik, A.P., Schillé, J.P., J. Electron. Mater. 37 (2008) 23-31
Poirier, D.R., Metall. Trans. B 18 (1987) 245-256
Natsume, Y., Takahashi, M.D., Kawashima, K., Tanigawa, E., Ohsasa, K., ISIJ Int. 54 (2014) 3238-3241
Bealy, M.E., Thomas, B.G., Metall. Mater. Trans. B 27 (1996) 1209-1220