To estimate the quality condition in continuously cast steel slabs, simple but accurate macrosegregation criteria have been proposed. The formation of macrosegregation phenomena in continuous casting of peritectic carbon steels has been investigated by metallographic study of collected slab samples. The metallographic study involved plant trails to collect the slab samples and to prepare them for chemical macrosegregation analysis. The experimental results show a fluctuation of carbon between positive and negative segregation with distance from slab surface based on the cooling conditions experienced by the slab. Via mathematical analysis, formulae of average macrosegregation level ASL, its fluctuation level FSL and its segregation quality number SQN have been developed. The results calculated by these formulae show good agreement with the description of the formation mechanisms of different continuous casting defects and their locations. Therefore, these calculations illustrated that macrosegregation criteria and their distributions can be considered by experimental, simple and vital tools to evaluate the conditions of surface and inner qualities in continuously cast steel slabs. The mechanisms of these criteria with some mechanisms of continuous casting defects have been explained and discussed.
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References
1.
TakeuchiE. and BrimacombeJ. K.: Metall. Trans. B, 1985, 16B, 605–625.
2.
JacobsonN.RaihleC.-M. and LeskinenN.: Scand. J. Metall., 1992, 21, 172–180.
3.
KitamuraM.SoejimaT.KoyamaS.MatsudaY.AbuJ.NimiyaY. and YaoY.: Tetsu-to-Hagané, 1981, 67, 1229–1235.
El-BealyM. O.: ‘Air–water mist and homogeneity degree of spray cooling zones for improving quality in continuous casting of steel’,Steel Res. Int., 2011, 82, 1187–1206.
6.
El-BealyM. O.: ‘Spray cooling pattern and micro-thermo-mechanical rigidity criterion for improving inner quality in continuously cast steel slabs’, Ironmaking Steelmaking, 2013, 40, 167–188.
7.
El-BealyM. O.: ‘On the formation of interdendritic internal cracks during dendritic solidification of continuously cast steel slabs’, Metall. Trans. B, 2012, 43, 1488–1516.
8.
AliI. S.: ‘2-D mechanical soft reduction technology of thick slabs’, technical communications; 2012, Helwan, Egyptian Iron and Steel Company.
9.
IrvingW. R. and PerkinsA.: ‘Continuous casting of steel’, 107–115; 1977, Biarritz, The Metals Society & IRSID.
10.
BrimacombeJ. K. and SorimachiK.: Metall. Trans. B, 1977, 8B, 489–505.
11.
MiyazawaK. and SchwerdtfegerK.: Arch. Eisenhuttenwes, 1981, 52, 415–422.
12.
SivessonP.RaihleC.-M. and KinttinenJ.: Mater. Sci. Eng. A, 1993, A173, 299–304.
13.
El-BealyM.: Scand. J. Metall., 1995, 24, (Parts I & II), 63–80, 106–20.
14.
El-BealyM. O.: “Macrosegregation and Interdendritic cracks in Steel Casting Processes” Doctoral Thesis, 1995, Royal Institute of Technology, Faculty of Engineering, Dept. Materials Processing, Stockholm Sweden.
15.
PoirierD. R.NandapurkarP. J. and GanesanS.: Metall. Trans. B, 1991, 22B, 889–900.
16.
TakeuchiE. and BrimacombeJ. K.: Metall. Trans. B, 1984, 15B, 493–509.
17.
BrimacombeJ. K.WeinbergF. and HawboltE. B.: Metall. Trans. B, 1979, 10B, 279–292.
18.
JacobssonN.RaihleC.-M. and LeskinenN.: Scand. J. Metall., 1992, 21, 172–180.
19.
KorG. J. W.: Ironmaking Steelmaking, 1982, 9, (6), 244–251.
20.
BridgeM. R. and RogersG. D.: Metall. Trans. B, 1984, 15B, 581–589.
21.
HardinR. A.LiuK.KapoorA. and BeckermannC.: Metall. Trans. B, 2003, 34B, 297–306.
22.
El-BealyM.LeskinenN. and FredrikssonH.: Ironmaking Steelmaking, 1995, 22, 246–255.
23.
RogbergB.: ‘High temperature properties of steels and their influence on the formation of defects in continuous casting’, PhD thesis, Royal Institute of Technology, Stockholm, Sweden, 1982.
24.
FlemingsM. C.MehrabianR. and NereoG. E.: Trans. TMS-AIME, 1968, 242, 41–49.
25.
FlemingsM. C. and NereoG. E.: Trans. TMS-AIME, 1968, 242, 50–55.
26.
El-BealyM. and FredrikssonH.: Scand. J. Metall., 1994, 23, 140–50.
27.
El-BealyM. and FredrikssonH.: Metall. Trans. B, 1996, 27B, 999–1014.
28.
El-BealyM. O.: Proc. 4th Int. Conf. on ‘Process development in iron and steelmaking’, SWEREA/MEFOSLulea, Sweden, 2012, Vol. 2, 359–368.
29.
El-BealyM. and FredrikssonH.: Proc. Conf. on ‘Advances in continuous casting research and technology’, Ain Shams University, Faculty of Engineering, Cairo, Egypt, 1992.
30.
El-BealyM.LeskinenN. and FredrikssonH.: Proc. Conf. on ‘Modeling of casting, welding and advanced solidification VI’, TMS-AIME, Warrendale, PA, FL, USA, 1993.
31.
FlemingsM. C.: Metall. Trans. A, 1991, 22A, 957–981.
32.
UeharaM.SamarasekeraI. V. and BrimacombeJ. K.: Ironmaking Steelmaking, 1986, 13, 138–153.
33.
BäckerL. and GosselinP.: Proc. Open Heart Conf., ISS-AIME, Warrendale, PA, Detroit, MI, USA, 1970, Vol. 53, 145–153.
34.
DahlW. and HengstenbergH.: Z. Metallkd, 1969, 60, 340–350.
35.
OzekiR. K. and DukeJ. D.: Proc. Int. Conf. on ‘Continuous casting of steel’, Biarritz, France, 1976, The Metals Society of IRSID.
36.
MuojekwuC. A.SamarasekeraI. V. and BrimacombeJ. K.: Metall. Trans. B, 26B, 361–382.
37.
El-BealyM. O. and HammoudaR. M.: Steel Res. Int., 2007, 78, 602–611.
38.
FlemingsM. C. and NereoG. E.: Trans. TMS-AIME, 1967, 239, 1449–1461.
39.
ShahN. A. and MooreJ. J.: Metall. Trans. B, 1989, 20B, 893–910.
40.
El-MahallawyN. A. and AssarA. M.: J. Mater. Sci., 1991, 26, 1729–1733.
41.
HoK. and PehlkeR. D.: Metall. Trans. B, 1985, 16B, 585–594.
42.
El-BealyM. and FredrikssonH.: Scand. J. Metall., 1994, 23, 140–150.
43.
MuojekwuC. A.SamarasekeraI. V. and BrimacombeJ. K.: Metall. Trans. B, 1995, 26B, 361–382.
44.
LimaJ. E. R.BrimacombeJ. K. and SamarasekeraI. V.: Ironmaking Steelmaking, 1991, 18, 114–128.
